WO2011142089A1 - フレキシブル半導体装置およびその製造方法ならびに画像表示装置 - Google Patents
フレキシブル半導体装置およびその製造方法ならびに画像表示装置 Download PDFInfo
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- WO2011142089A1 WO2011142089A1 PCT/JP2011/002368 JP2011002368W WO2011142089A1 WO 2011142089 A1 WO2011142089 A1 WO 2011142089A1 JP 2011002368 W JP2011002368 W JP 2011002368W WO 2011142089 A1 WO2011142089 A1 WO 2011142089A1
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- H01L29/7869—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
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Definitions
- the present invention relates to a flexible semiconductor device having flexibility and a method for manufacturing the same. More specifically, the present invention relates to a flexible semiconductor device that can be used as a TFT and a method for manufacturing the same. Furthermore, the present invention relates to an image display device using such a flexible semiconductor device.
- a display medium is formed using an element utilizing liquid crystal, organic EL (organic electroluminescence), electrophoresis, or the like.
- a technique using an active drive element (TFT element) as an image drive element has become mainstream in order to ensure uniformity of screen brightness, screen rewrite speed, and the like.
- TFT element active drive element
- these TFT elements are formed on a substrate, and liquid crystal, organic EL elements, etc. are sealed.
- a semiconductor such as a-Si (amorphous silicon) or p-Si (polysilicon) can be mainly used for the TFT element.
- a TFT element is manufactured by multilayering these Si semiconductors (and a metal film if necessary) and sequentially forming source, drain and gate electrodes on the substrate.
- a material that can withstand a high process temperature must be used as a substrate material. Therefore, in practice, it is necessary to use a substrate made of a material having excellent heat resistance, for example, a glass substrate. Although a quartz substrate can be used, it is expensive, and there is an economical problem in increasing the size of the display. Therefore, a glass substrate is generally used as the substrate on which the TFT element is formed.
- the display is heavy, lacks flexibility, and may be broken by a drop impact.
- These characteristics resulting from the formation of TFT elements on a glass substrate are undesirable in satisfying the need for an easy-to-use portable thin display accompanying the progress of computerization.
- a flexible semiconductor device in which a TFT element is formed on a resin substrate ie, a plastic substrate
- a resin substrate ie, a plastic substrate
- Patent Document 2 after a TFT is manufactured on a support (for example, a glass substrate) by a process substantially similar to the conventional method, the TFT is peeled off from the glass substrate and transferred onto a resin substrate (that is, a plastic substrate).
- a resin substrate that is, a plastic substrate
- a TFT element is formed on a glass substrate, and the TFT element is adhered to the resin substrate through a sealing layer such as an acrylic resin, and then the glass substrate is peeled off, whereby the TFT element is formed on the resin substrate. Is being transcribed.
- a peeling process of a support becomes a problem. That is, in the step of peeling the support from the resin substrate, for example, a treatment for reducing the adhesion between the support and the TFT is performed, or a release layer is formed between the support and the TFT, and this release layer is formed. It is necessary to perform a process for physically or chemically removing the material. Therefore, the manufacturing process of the flexible semiconductor device is complicated, and a problem of productivity may occur.
- the position where the semiconductor layer is formed is important. If the accuracy is not good, the desired TFT performance cannot be obtained, and in terms of the production yield of the flexible semiconductor device. Problems arise.
- a flexible semiconductor device is formed by laminating a plurality of layers, it is required to suppress misalignment of individual layers, and therefore, improvement in adhesion between layers is required. It is done.
- the inventor of the present application tried to solve the problems of the flexible semiconductor device described above, instead of dealing with the extension of the prior art, in a new direction and to solve these problems.
- the present invention has been made in view of such circumstances, and a main object thereof is to provide a method for manufacturing a flexible semiconductor device excellent in productivity, and accordingly, a high-performance flexible semiconductor device is provided. Is to provide.
- a method for manufacturing a flexible semiconductor device comprising: Preparing a metal foil (A), Forming an insulating layer including a portion to be a gate insulating film on the metal foil (B), Forming a support substrate on the insulating layer (C); Etching a part of the metal foil to form a source electrode and a drain electrode from the metal foil (D), Forming a semiconductor layer in a gap located between the source electrode and the drain electrode using the source electrode and the drain electrode as a bank member (E), Step (F) of forming a resin film layer on the insulating layer so as to cover the semiconductor layer, the source electrode, and the drain electrode
- a method for manufacturing a flexible semiconductor device is provided in which a part of the resin film layer is fitted into the gap between the source electrode and the drain electrode.
- the manufacturing method of the present invention is to form a “gap” between a source electrode and a drain electrode, and to manufacture a flexible semiconductor device suitably using the gap. More specifically, a source electrode and a drain electrode arranged with a “gap” obtained by etching a metal foil are used as bank members, and a semiconductor layer is formed so as to fit in the gap.
- the term “flexible” of “flexible semiconductor device” substantially means that the semiconductor device has flexibility to bend.
- the “flexible semiconductor device” in the present invention can be referred to as a “flexible semiconductor device” or a “flexible semiconductor element” in view of its configuration.
- the “bank member” used in this specification is derived from “bank”, but is substantially a member having a function of “positioning” the raw material / material of the semiconductor layer. I mean.
- the “gap” in the bank member is provided by etching the metal foil with the intention of such “positioning”, and therefore is inevitably or accidentally formed due to the manufacturing process or the like. Note that it does not mean scratches, dents, or gaps.
- the end surfaces facing each other with the “gap” between the surfaces formed by the source electrode and the drain electrode are formed as inclined surfaces.
- the opposing end surfaces are inclined by performing photolithography and etching. More specifically, the end surfaces of the source electrode and the drain electrode are formed as inclined surfaces by wet etching so that the shape formed by the “gap” is a tapered shape.
- the resin film is bonded onto the insulating layer, and at this time, a part of the resin film is fitted in the “gap”.
- a part of the resin film layer precursor is “a source electrode and a drain electrode located on the support substrate. Bonding while pressing so as to be embedded in the “gap between”.
- Such a resin film layer can be formed by a roll-to-roll method.
- the gate electrode after the support substrate is removed, the gate electrode may be formed on the surface of the portion of the insulating layer that becomes the gate insulating film.
- the gate electrode may be formed by patterning the metal base after the step (F).
- a ceramic substrate or a metal substrate is used as the support substrate.
- the semiconductor layer and / or the gate insulating film can be positively subjected to heat treatment.
- the heat treatment can be performed on the semiconductor layer over the supporting substrate after the step (E).
- the semiconductor layer is annealed by irradiating the semiconductor layer on the “supporting substrate made of a ceramic substrate or a metal substrate” with a laser.
- the film quality or characteristics of the semiconductor layer can be changed, whereby the semiconductor characteristics can be improved (for example, the crystallinity of the semiconductor layer can be improved by “change in film quality”).
- the term “annealing” substantially means, for example, heat treatment for the purpose of improving “crystal state”, “crystallinity” and / or “mobility” and stabilizing properties. is doing.
- the gate insulating film is heat-treated after the step (B).
- the insulating layer is annealed by irradiating the gate insulating film (insulating layer) with laser. Such treatment of the insulating layer may be performed between the step (D) and the step (E), but may be performed between the step (E) and the step (F).
- the gate insulating film may be directly subjected to heat treatment (particularly annealing), or when the semiconductor layer is heated, the insulating film may be heated (particularly annealed) by heat generated in the semiconductor layer. Good. Furthermore, the insulating layer may be subjected to heat treatment between the steps (B) and (C), that is, the insulating layer on the metal foil may be directly heat-treated. .
- the insulating layer including the gate insulating film is formed from an inorganic material.
- an insulating layer including a gate insulating film may be formed by a sol-gel method, or an insulating layer may be formed by local anodization of a valve metal forming a metal foil.
- the present invention also provides a flexible semiconductor device that can be obtained by the above manufacturing method.
- a flexible semiconductor device of the present invention includes: Gate electrode, An insulating layer provided on the gate electrode and having a portion to be a gate insulating film; Comprising a source electrode and a drain electrode formed on an insulating layer and composed of a metal foil; There is a gap between the source electrode and the drain electrode, whereby the source electrode and the drain electrode arranged across the gap are bank members, The semiconductor layer is formed to fit in the gap, A resin film layer is formed on the insulating layer so as to cover the semiconductor layer, the source electrode, and the drain electrode, and the resin film layer is provided with a protrusion fitted in the gap.
- One feature of the flexible semiconductor device of the present invention is that a gap is formed between the end face of the source electrode and the end face of the drain electrode, and the semiconductor layer is formed so as to be accommodated in the gap. (That is, the semiconductor layer is formed so as to fit between the source electrode and the drain electrode which are separated from each other).
- the “bank member composed of the source electrode and the drain electrode arranged with a gap” is a member composed of an electrode element provided for the purpose of “positioning” of the material, as described above. It is a member composed of two types of electrode elements that function as “positioning” of the layer material.
- the flexible semiconductor device of the present invention is configured by accommodating a semiconductor layer between two types of bank electrodes such as a source electrode and a drain electrode.
- the “gap part” in such a bank member preferably has a taper shape, and the end surfaces facing each other across the gap are inclined surfaces among the surfaces formed by the source electrode and the drain electrode (more specifically, The gap itself is tapered, and as a result, the end surfaces of the source electrode and the drain electrode are inclined).
- the resin film layer having flexibility is formed on the insulating layer so as to cover the semiconductor layer, the source electrode, and the drain electrode. And a protrusion fitted in the gap between the two. More specifically, the “projection part of the resin film layer” is complementarily fitted in the “gap”. In other words, the “projection on the resin film layer” and the “gap between the source electrode and the drain electrode” have complementary shapes, and the projection on the resin film layer has a gap (other than the filling region of the semiconductor layer). Of the gap).
- the semiconductor layer in the flexible semiconductor device of the present invention may contain silicon, or may contain an oxide semiconductor (for example, ZnO or InGaZnO).
- the gate insulating film is made of an inorganic material.
- the insulating layer including the gate insulating film may be obtained by locally oxidizing the metal foil.
- the metal foil may contain a valve metal, and the gate insulating film or the insulating layer may be an anodized film of the valve metal.
- the gate insulating film or insulating layer is an oxide film obtained by a sol-gel method.
- the present invention also provides an image display device using the flexible semiconductor device.
- Such an image display device A flexible semiconductor device; and an image display unit composed of a plurality of pixels formed on the flexible semiconductor device, There is a gap between the source electrode and the drain electrode of the flexible semiconductor device, whereby the source electrode and the drain electrode arranged with the gap therebetween are bank members, A semiconductor layer of the flexible semiconductor device is formed in the gap, and a protrusion film fitted into the gap is provided in the resin film layer of the flexible semiconductor device.
- the semiconductor layer can be suitably disposed due to the use of the source electrode and the drain electrode disposed with a gap as the bank member.
- the semiconductor layer can be formed at a desired position relatively easily.
- the semiconductor layer raw material is in the form of paste or liquid, the semiconductor raw material supplied to the “gap” is held without flowing out of the “gap”.
- the formation of the semiconductor layer is assisted at the position “”.
- the gap functions not only as a “positioning” bank but also for “storage”. It can also function as a bank.
- the source electrode and drain electrode functioning as a positioning bank can be used as the “source electrode” and “drain electrode” of the TFT as they are as the constituent elements of the flexible semiconductor device. This means that it is not necessary to finally remove or peel off the bank member that has contributed favorably to semiconductor formation. Therefore, the TFT element can be manufactured by a simple process, and the productivity is improved. Can do.
- the resin film layer is prevented from peeling off. An effect can be obtained. This is because the “projection on the resin film layer” and the “gap” are in a complementary fitting state, and due to such structural features, the adhesion of the resin film layer is improved. be able to. In other words, in the present invention, the adhesion of the laminated structure can be improved due to the “source and drain electrodes arranged with a gap” functioning as a bank member.
- the improved adhesion of the laminated structure is a particularly advantageous effect when the flexible semiconductor is subjected to a bent state such as a roll-to-roll method. That is, even if it is a manufacturing condition which can induce peeling of such a laminated structure, since peeling will be prevented effectively, productivity can be improved also in that respect.
- the obtained flexible semiconductor device has a firmly laminated structure, it is difficult to cause performance degradation due to “peeling”.
- the flexible semiconductor device is often used by being bent, in the flexible semiconductor device of the present invention, it is caused by the “source electrode and drain electrode arranged with a gap” functioning as a bank member. Since peeling is suitably prevented, a flexible semiconductor device that is particularly resistant to bending is realized.
- the gate insulating film and the support substrate are used while being a flexible semiconductor device.
- the semiconductor layer can be heat-treated (particularly preferably annealed), and the characteristics thereof can be improved. That is, the performance of the obtained flexible semiconductor device can be effectively improved.
- (A) is a perspective cross-sectional view schematically showing the configuration of the flexible semiconductor device 100 according to the embodiment of the present invention, and (b) is a top view for explaining the transistor structure around the gap 50.
- (A)-(d) is process sectional drawing for demonstrating the manufacturing process of the flexible semiconductor device 100 which concerns on embodiment of this invention.
- (A)-(c) is process sectional drawing for demonstrating the manufacturing process of the flexible semiconductor device 100 which concerns on embodiment of this invention.
- FIG. 4C is a top view for explaining a transistor structure around the gap 50.
- (A)-(d) is process sectional drawing for demonstrating the manufacturing process of the flexible semiconductor device 100 which concerns on embodiment of this invention of the mask aspect.
- (A)-(c) is process sectional drawing for demonstrating the manufacturing process of the flexible semiconductor device 100 which concerns on embodiment of this invention of a mask aspect.
- (A) And (b) is process sectional drawing for demonstrating the manufacturing process of the flexible semiconductor device 100 which concerns on embodiment of this invention of a mask aspect.
- (A)-(d) is process sectional drawing for demonstrating the manufacturing process of flexible semiconductor device 100 'based on embodiment of this invention of a mask aspect.
- (A)-(c) is process sectional drawing for demonstrating the manufacturing process of flexible semiconductor device 100 'which concerns on embodiment of this invention of the mask aspect.
- (A) And (b) is process sectional drawing for demonstrating the manufacturing process of flexible semiconductor device 100 'which concerns on embodiment of this invention of a mask aspect.
- the circuit diagram which shows the drive circuit 90 of the image display apparatus which concerns on embodiment of this invention.
- (A) is sectional drawing which shows an example of the laminated structure 200 by which the drive circuit of the image display apparatus was comprised by the flexible semiconductor device 100
- (b) is the laminated structure 200 in embodiment of this invention of a mask aspect.
- FIG. 1 The top view which shows the layer 101 in the laminated structure 200, (b) is the top view which shows the layer 101 in the laminated structure 200 of a mask aspect (A) The top view which shows the layer 102 in the laminated structure 200, (b) The top view which shows the layer 102 in the laminated structure 200 of a mask aspect (A) The top view which shows the layer 103 in the laminated structure 200, (b) is the top view which shows the layer 103 in the laminated structure 200 of a mask aspect (A) The top view which shows the layer 104 in the laminated structure 200, (b) is the top view which shows the layer 104 in the laminated structure 200 of a mask aspect (A) The top view which shows the layer 105 in the laminated structure 200, (b) is the top view which shows the layer 105 in the laminated structure 200 of a mask aspect (A) Cross-sectional view of stacked structure 200 along line VII-VII, and (b) Cross-sectional view of stacked structure 200 along line X
- the schematic diagram showing the aspect by which the flexible semiconductor device 100 is manufactured by the roll-to-roll method (A) Sectional drawing which expands and shows a part of laminated structure 110 wound up by the roller 230, and (b) is sectional drawing of the said laminated structure 110 in embodiment of this invention of a mask aspect.
- Schematic diagram showing a product application example (TV image display unit) of a flexible semiconductor device Schematic diagram showing a product application example (image display part of a mobile phone) of a flexible semiconductor device
- Schematic diagram showing an example of product application of a flexible semiconductor device image display part of a mobile personal computer or notebook personal computer
- Schematic diagram showing an example of product application of a flexible semiconductor device image display section of a digital still camera
- Schematic diagram showing a product application example of a flexible semiconductor device image display part of a camcorder
- the “direction” (particularly “direction” in the manufacturing process of the present invention) described in the present specification is a direction based on the positional relationship between the insulating layer 10 and the semiconductor layer 20, and for convenience, the vertical direction in the figure. Will be explained. Basically, it corresponds to the vertical direction of each figure, the side on which the semiconductor layer 20 is formed with respect to the insulating layer 10 is “upward”, and the side on which the semiconductor layer 20 is not formed with respect to the insulating layer 10 Is “downward”.
- FIG. 1A is a perspective view schematically showing the configuration of the flexible semiconductor device 100 of the present invention.
- FIG. 1B is a diagram showing the relationship among the source 30 s, the channel 22 (20), and the drain 30 d of the flexible semiconductor device 100.
- the flexible semiconductor device 100 is a flexible semiconductor device. As shown in the figure, the flexible semiconductor device 100 includes an insulating layer 10 having a portion to be a gate insulating film 10g, and a source electrode 30s and a drain electrode 30d formed of a metal foil 70. The source electrode 30 s and the drain electrode 30 d are formed on the insulating layer 10.
- a gap 50 exists between the source electrode 30s and the drain electrode 30d.
- the source electrode 30s and the drain electrode 30d arranged with the gap 50 therebetween function as a bank member. That is, the gap 50 functions as a positioning bank that determines the position where the semiconductor layer is formed when the semiconductor layer is formed. When the semiconductor raw material is liquid, the gap 50 also functions as a storage bank.
- the semiconductor layer 20 is formed so as to fill at least a part of the gap 50.
- the shape of the gap 50 can be seen through the semiconductor layer 20.
- a resin film layer 60 is formed on the insulating layer 10 so as to cover the semiconductor layer 20, the source electrode 30s, and the drain electrode 30d.
- the resin film layer 60 is represented by a dotted line (two-point difference line).
- a part of the resin film layer 60 is a protrusion 65 that fits into the gap 50.
- the “projection 65 of the resin film layer 60” and the “gap 50” are fitted to each other so as to have complementary shapes.
- the protrusion 65 and the gap 50 are fitted to each other, whereby the degree of adhesion between the “resin film layer 60” and the “structure including the source electrode 30s and the drain electrode 30d” can be improved. That is, due to the gap 50, the adhesion of the laminated structure of the flexible semiconductor device 100 is improved.
- the gate electrode 12 is formed at a position opposite to the semiconductor layer 20 with the insulating layer 10 interposed therebetween. In other words, the gate electrode 12 is provided on the surface of the insulating layer 10 which becomes the gate insulating film 10g.
- the semiconductor layer 20 in the present embodiment is obtained by causing “gap” to function as a bank.
- a semiconductor layer is formed in a gap region by using a thin film forming method or a printing method, a semiconductor material is deposited in the gap 50 regardless of a slight shift in raw material supply, and the deposit is used as a semiconductor layer. Therefore, the gap 50 can function as a positioning bank that determines the semiconductor layer formation position (see FIG. 4).
- the semiconductor layer 20 is made of silicon (Si)
- the liquid silicon is dropped into the gap 50 to form the semiconductor layer 20, but the gap 50 also plays a role of holding the liquid silicon. become.
- the gap 50 can function not only as a “positioning element” for the semiconductor raw material but also as a “storage element” having an action of holding the semiconductor raw material. .
- various materials can be used in addition to the above-described silicon (Si).
- a semiconductor such as germanium (Ge) may be used, or oxidation may be performed.
- a physical semiconductor may be used.
- the oxide semiconductor include single oxides such as ZnO, SnO 2 , In 2 O 3 , and TiO 2 , and composite oxides such as InGaZnO, InSnO, InZnO, and ZnMgO.
- a compound semiconductor for example, GaN, SiC, ZnSe, CdS, GaAs, etc.
- organic semiconductors for example, pentacene, poly-3-hexylthiophene, porphyrin derivatives, copper phthalocyanine, C60
- organic semiconductors for example, pentacene, poly-3-hexylthiophene, porphyrin derivatives, copper phthalocyanine, C60
- the insulating layer 10 including the gate insulating film 10g in this embodiment is made of an inorganic material.
- the gate insulating film 10g can be formed of a silicon oxide film (SiO 2 ) or a silicon nitride film. Note that the gate insulating film 10g can also be manufactured using a sol-gel method. Further, the gate insulating film 10g can be composed of an oxide film formed by anodizing the metal foil 70.
- the structure around the gap 50 of the present embodiment When the structure around the gap 50 of the present embodiment is viewed from above, it can be represented as shown in FIG.
- the semiconductor layer 20 On the gate insulating film 10g in the gap 50, the semiconductor layer 20 is formed.
- the semiconductor layer 20 is in contact with the source electrode 30s and the drain electrode 30d.
- the gate insulating film 10g and the gate electrode 12 are located on the lower surface (bottom surface) of the semiconductor layer 20, the gate insulating film 10g and the gate electrode 12 are located. Therefore, a portion of the semiconductor layer 20 located between the source electrode 30s and the drain electrode 30d becomes the channel region 22, and a transistor (thin film transistor: TFT) is constructed by these elements.
- TFT thin film transistor
- the resin film layer 60 of the present embodiment is made of a flexible resin material.
- the resin film layer 60 can function as a support substrate for supporting the transistor structure including the semiconductor layer 20 and is made of a thermosetting resin material or a thermoplastic resin material having flexibility after curing.
- resin materials include epoxy resins, polyimide (PI) resins, acrylic resins, polyethylene terephthalate (PET) resins, polyethylene naphthalate (PEN) resins, polyphenylene sulfide (PPS) resins, and polyphenylene ether (PPE) resins.
- Fluororesins such as PTFE, liquid crystal polymers, and composites thereof.
- the resin film layer 60 may be made of an organic-inorganic hybrid material containing polysiloxane or the like.
- the resin material as described above is excellent in the property of dimensional stability and is preferable as the material for the flexible substrate in the present invention.
- FIGS. 2 (a) to (d) and FIGS. 3 (a) to (c) a method of manufacturing the flexible semiconductor device 100 according to the present invention will be described.
- 2A to 2D and FIGS. 3A to 3C are process cross-sectional views for explaining a method for manufacturing the flexible semiconductor device 100.
- FIG. 1
- the step (A) is carried out. That is, the metal foil 70 is prepared as shown in FIG.
- the metal foil 70 of this embodiment may be made of, for example, a copper foil or an aluminum foil.
- the thickness of the metal foil 70 is, for example, about 0.5 ⁇ m to 100 ⁇ m, preferably about 2 to 20 ⁇ m.
- the insulating layer 10 is formed on the surface of the metal foil 70 as shown in FIG. 2B (the thickness of the insulating layer 10 may be about 30 nm to 2 ⁇ m).
- the insulating layer 10 also includes a portion (10 g) that becomes a gate insulating film.
- the insulating layer 10 may be silicon oxide, for example. In such a case, a silicon oxide thin film obtained by, for example, TEOS may be formed.
- the insulating layer 10 having a portion that becomes a gate insulating film can be made of an inorganic material. That is, in a flexible semiconductor device using a resin base material as a supporting substrate, an organic insulating film can be used as a gate insulating film. However, in the present invention, a gate insulating film made of an inorganic material can be used. The transistor characteristics of the device 100 can be improved.
- a gate insulating film made of an inorganic material has a higher withstand voltage and a higher dielectric constant than a gate insulating film made of an organic material even if it is thin.
- the insulating layer 10 is formed on the surface of the metal foil 70, there are few process restrictions when the insulating layer 10 is manufactured. Therefore, in the present invention, a gate insulating film made of an inorganic material can be easily formed even when a gate insulating film of a flexible semiconductor device is manufactured. Further, even after the insulating layer 10 is formed on the metal foil 70, since the base is the metal foil 70, the insulating layer 10 can be annealed (heat treated) to improve the film quality.
- the insulating layer 10 can be formed by locally anodizing the surface region of the metal foil 70 (insulating layer formed by local anodization). May be about 30 nm to 200 nm). Anodization of aluminum can be easily performed using various chemical conversion liquids, thereby forming a very thin and dense oxide film.
- the chemical conversion solution a “mixed solution of tartaric acid aqueous solution and ethylene glycol” adjusted to have a pH near neutral with ammonia can be used.
- the metal foil 70 that can form the insulating layer 10 by anodic oxidation is not limited to aluminum, but may be any metal that has good electrical conductivity and can easily form a dense oxide. Metal).
- valve metal examples include at least one metal or alloy selected from the group consisting of aluminum, tantalum, niobium, titanium, hafnium, zirconium, molybdenum, and tungsten.
- a metal or alloy selected from the group consisting of aluminum, tantalum, niobium, titanium, hafnium, zirconium, molybdenum, and tungsten.
- the metal foil 70 is not limited to the valve metal (for example, aluminum), but may be any metal foil other than the valve metal as long as the metal surface is uniformly covered with an oxide film by oxidation. There may be.
- the oxidation method of the metal foil 70 can use thermal oxidation (surface oxidation treatment by heating) or chemical oxidation (surface oxidation treatment by an oxidizing agent) instead of anodic oxidation.
- the insulating layer 10 can be formed using a sol-gel method (the thickness of the insulating layer formed by the sol-gel method may be about 100 nm to 1 ⁇ m).
- the insulating layer 10 is made of, for example, a silicon oxide film.
- An example of a method for forming a silicon oxide film by a sol-gel method is as follows: a mixed solution of tetraethoxysilane (TEOS), methyltriethoxysilane (MTES), ethanol, and dilute hydrochloric acid (0.1 wt%) at room temperature for 2 hours.
- the colloidal solution (sol) prepared by stirring can be uniformly coated on a metal foil by a spin coating method, followed by heat treatment at 300 ° C. for 15 minutes.
- the sol-gel method has an advantage that not only a silicon oxide film but also a high dielectric constant gate insulating film such as a hafnium oxide film, an aluminum oxide film, or a titanium oxide film can be produced.
- a support substrate 72 is formed on the insulating layer 10. That is, step (C) of the manufacturing method of the present invention is performed.
- the support substrate 72 may be a ceramic substrate (for example, alumina (Al 2 O 3 ), zirconia (ZrO)), or a metal substrate (for example, a stainless substrate such as SUS304).
- a resin base material may be used as the support substrate 72.
- the support substrate 72 can be provided on the insulating layer 10 by attaching such a base material to the insulating layer 10 (using an adhesive as necessary).
- step (D) of the manufacturing method of the present invention is performed.
- the whole is held by the support substrate 72. In other words, even if the metal foil 70 is etched, the whole is not cut and broken.
- the formation of the source electrode 30s and the drain electrode 30d can be performed, for example, by a combination of photolithography and etching.
- the details are as follows. First, a photoresist material such as a dry film or a liquid type is formed on the entire surface of the metal foil 70. Next, pattern exposure and development are performed using a photomask having a pattern defining the shape and position of the source electrode 30s and the drain electrode 30d. Next, when the metal foil 70 is immersed in an etching solution using a photoresist having a pattern corresponding to the source electrode 30s and the drain electrode 30d as a mask, between the source electrode 30s and the drain electrode 30d and both electrodes (30s and 30d). A gap 50 located at is formed.
- the “source electrode and drain electrode arranged with a gap” is completed.
- an appropriate etchant can be selected and used depending on the type of metal foil. For example, when copper foil is used, a ferric chloride solution or a hydrogen peroxide / sulfuric acid solution can be used. In the case of an aluminum foil, a mixed solution of phosphoric acid, acetic acid and nitric acid can be used.
- the end surface 50b that faces the gap 50 is an inclined surface.
- the periphery of the gap 50 includes a bottom surface 50a, a wall surface 50b, and an upper surface 50c, and the wall surface 50b is inclined.
- the angle ⁇ formed by the wall surface 50b and the upper surface 50c is an obtuse angle.
- the angle ⁇ is about 100 ° to 170 °, preferably about 110 ° to 160 ° (see FIG. 2D).
- the height / depth dimension h of the gap 50 as shown in FIG. 2D is preferably about 0.5 ⁇ m to 100 ⁇ m, more preferably about 2 ⁇ m to 20 ⁇ m.
- the semiconductor layer 20 is formed in the gap 50 using the source electrode 30s and the drain electrode 30d as bank members. That is, the process (E) of the manufacturing method of the present invention is performed.
- the “source electrode and drain electrode arranged with the gap 50 therebetween” function as a bank member for “positioning”, so that the semiconductor layer 20 can be suitably formed.
- the semiconductor layer 20 is formed on the insulating layer 10 that becomes the bottom surface 50a around the gap 50 (the portion that becomes the gate insulating film 10g) (the thickness of the semiconductor layer 20 is about 30 nm to 1 ⁇ m. It is preferably about 50 nm to 300 nm). That is, the semiconductor layer 20 is formed so as to be accommodated in the gap 50.
- a semiconductor layer is formed by a thin film formation method or a printing method
- a provided semiconductor material is deposited in the gap 50, and the deposit can be used as a semiconductor layer. It will serve to determine the position (see FIG. 4). That is, the “source electrode and drain electrode arranged with the gap 50 therebetween” functions as a bank member for “positioning”.
- the thin film forming method include vacuum deposition, sputtering, and plasma CVD.
- the printing method include letterpress printing, gravure printing, screen printing, and ink jet.
- the “source and drain electrodes arranged with the gap 50 therebetween” function as a “positioning” bank member and also as a “storage” bank member. Function.
- the semiconductor layer 20 is formed as a silicon layer, as an example, a cyclic silane compound-containing solution (for example, a toluene solution of cyclopentasilane) is applied onto the bottom surface 50a of the gap 50 using a method such as inkjet, By performing heat treatment at 300 ° C., the semiconductor layer 20 made of amorphous silicon can be formed.
- a cyclic silane compound-containing solution for example, a toluene solution of cyclopentasilane
- the semiconductor layer 20 can be annealed.
- the film quality of the semiconductor layer 20 can be improved or modified.
- the support substrate 72 is a ceramic base material or a metal base material, it is excellent in heat resistance, so that there is substantially no problem even if a high temperature annealing treatment is performed. Even if the support substrate 72 is made of a resin base material, the support substrate 72 is finally removed. Therefore, even if the film quality of the support substrate 72 made of the resin base material is relatively deteriorated, the support substrate 72 If it functions as, it is possible to perform the annealing process of the semiconductor layer 20.
- the semiconductor layer 20 made of amorphous silicon is formed in the gap 50, it can be changed to polycrystalline silicon (for example, average grain size: about several hundred nm to 2 ⁇ m) after the annealing treatment.
- the semiconductor layer 20 is polycrystalline silicon, the crystallinity is improved by annealing treatment. Further, the mobility of the semiconductor layer 20 is improved due to the change in the film quality of the semiconductor layer 20, and the mobility is significantly different before and after the annealing process.
- the mobility of a-Si is ⁇ 1.0 (cm 2 / Vs).
- the mobility of ⁇ C-Si is about 3 (cm 2 / Vs), and the crystal grain size is 10 to 20 nm.
- the mobility of pC—Si polycrystalline silicon is about 100 (cm 2 / Vs) or about 10 to 300 (cm 2 / Vs), and the crystal grain size is 50 nm to 0.2 ⁇ m.
- the mobility of sC—Si is, for example, 600 (cm 2 / Vs) or more.
- annealing treatment in addition to a method of heat-treating the entire metal foil 70 on which the semiconductor layer 20 is formed, a method of heating the semiconductor layer 20 by irradiating the gap 50 with laser light may be adopted. It can.
- annealing is performed by irradiating laser light, for example, the following can be performed.
- an excimer laser (XeCl) having a wavelength of 308 nm can be irradiated with 100 to 200 shots at an energy density of 50 mJ / cm 2 and a pulse width of 30 nanoseconds. Note that specific annealing conditions are appropriately determined by comprehensively considering various factors.
- the heat treatment of the insulating layer 10 (particularly the gate insulating film 10g) may be performed. That is, the annealing process for the semiconductor layer 20 and the annealing process for the insulating layer 10 may be performed in the same process. Thereby, the film quality of the insulating layer 10 (especially the gate insulating film 10g) can also be changed. For example, when the semiconductor layer is heated, the gate insulating film 10g can also be heated due to the heat. When the insulating layer 10 is made of an oxide film (SiO 2 ) produced by thermal oxidation (wet oxidation) in water vapor, the insulating layer 10 is heated to reduce the electron trap level of the oxide film (SiO 2 ).
- wet oxidation is preferable because it has good productivity because the oxidation rate is about 10 times higher than dry oxidation, but it tends to increase the number of electron trap levels.
- dry oxidation although the generation of electron trap levels is small, the number of hole traps increases. Therefore, a gate oxide film with few electron traps and hole traps can be obtained with high productivity by heat-treating the oxide film formed by wet oxidation in an oxygen atmosphere.
- a resin film layer 60 is formed as a step (F). That is, as shown in FIG. 3B, the resin film layer 60 is formed so as to cover the source / drain electrodes 30 s and 30 d and the semiconductor layer 20. Thereby, the film laminated body (flexible substrate structure) 110 is obtained.
- the resin film layer 60 in forming the resin film layer 60, a part of the resin film 60 is inserted into the gap 50. That is, the resin film layer 60 is formed so that the gap 50 is filled with the resin film material. Thereby, the protrusion 65 fitted in the gap 50 in the resin film layer 60 is obtained. The protrusion 65 fits into the gap 50 as described above, thereby improving the adhesion between the resin film layer 60 and the transistor structure including the source / drain electrodes 30s and 30d.
- the angle ⁇ (see FIG. 2D) of the facing surface that defines the gap 50 is an obtuse angle as in the present invention
- the resin film 60 It is preferable because a part of the projection is easily inserted into the gap 50, and therefore, the fitting between the protrusion 65 and the gap 50 is easily formed.
- the angle ⁇ is an obtuse angle
- the function of the source / drain electrodes 30s and 30d as a bank member can be enhanced when the semiconductor layer 20 is formed, as compared with the case where the angle ⁇ is a right angle.
- the range in which the angle ⁇ is obtuse can be expanded.
- the alignment accuracy of the semiconductor layer 20 to be formed can be increased.
- the formation method of the resin film layer 60 is not particularly limited. For example, a method of bonding and curing a semi-cured resin film on the insulating layer 10 (even if an adhesive material is applied to the bonding surface of the resin sheet) Or a method of applying a liquid resin on the insulating layer 10 by spin coating or the like and curing it.
- the thickness of the formed resin film layer 60 is, for example, about 4 to 100 ⁇ m.
- a part of the resin film can be provided to the “gap 50 between the source electrode and the drain electrode” by pressurizing the resin film at the time of bonding. A part of the film layer can be fitted into the gap 50.
- a “resin film provided in advance with a convex portion having a shape substantially complementary to the shape of the gap 50” may be used as a resin film used for bonding.
- the resin sheet portion thickness may be about 2 to 100 ⁇ m, and the adhesive material portion thickness may be about 3 to 20 ⁇ m.
- the bonding conditions can be appropriately determined according to the curing characteristics of the resin film material and the adhesive material. For example, when using a resin film in which an epoxy resin is applied as an adhesive material (thickness: about 10 ⁇ m) to the bonding surface of a polyimide film (thickness: about 12.5 ⁇ m), first, a metal foil and a resin film are laminated. Then, it is heated to 60 ° C. and temporarily pressure-bonded under a pressure of 3 MPa. Then, the adhesive material is fully cured at 140 ° C. and 5 MPa for 1 hour.
- the semiconductor layer 20 can be protected, and handling and conveyance of the next process (such as patterning processing of the metal foil 70) can be stably performed. .
- the support substrate 72 is removed from the film laminate 110, and then the gate electrode 12 is formed on the surface of the gate insulating film 10g.
- the flexible semiconductor device 100 according to the present invention can be obtained.
- the gate electrode 12 can typically be formed from a metal paste (eg, Ag paste).
- the formation of the gate electrode 12 can be performed by applying a metal paste by a printing method such as screen printing, gravure printing, or an ink jet method, or a thin film forming method such as vacuum deposition, sputtering, or plasma CVD, or It can be carried out by a plating method.
- the support substrate 72 is made of a metal base material (or conductive material)
- the gate electrode 12 can be formed also by patterning the metal base material.
- a layer of a silane coupling agent having a high affinity for plastic is formed on the surface of a metal, or an epoxy resin having a large number of polar groups is used as an adhesive. A combination of specific materials is required, which narrows the room for material selection.
- the above-mentioned problem of adhesion / peeling can be exacerbated as the device becomes larger in the future, and the roll-to-roll method in which the laminate is bent into a roll shape (In the roll-to-roll method, the magnitude of strain differs between the upper and lower surfaces of the laminate, and problems such as peeling at the interface with weak adhesive strength are likely to occur).
- the protrusion 65 of the resin film layer 60 is fitted into the gap 50, whereby the resin film layer 60 and the "transistor structure including the source / drain electrodes 30s and 30d" Improved adhesion.
- the size and quantity of the protrusions of the fitting structure are not particularly limited, and the larger the size and the larger the number, the higher the effect.
- a fitting structure is separately formed in order to improve adhesiveness, the area of a portion where a transistor or wiring is formed is reduced, which is inconvenient.
- the channel portion between the source / drain electrodes 30 (30s, 30d) in the gap 50 is used as a fitting structure, a fitting structure for improving the adhesiveness is not separately formed. Also good.
- the size of the fitting structure in the present invention corresponds to the size of the transistor structure, for example, the bottom of the gap is 1 ⁇ m to 1 mm and the height is about 0.5 ⁇ m to 100 ⁇ m.
- the surface density of the fitting structure is determined in accordance with the resolution and the screen size, for example, when used for an organic EL display.
- the NTSC vertical and horizontal pixel count is 720 ⁇ 480
- the Hula Hi-Vision vertical and horizontal pixel count is 1920.
- the number is about 3460 pieces / square inch.
- the present invention in an embodiment using a source / drain electrode having a gap as a mask
- the bank member as in the present invention can be used as a “mask” for forming another electrode by photocuring. Specifically, light irradiation is performed using a “source / drain electrode having a gap” obtained by etching a metal foil as a mask, thereby partially curing the photocurable conductive paste layer.
- a gate electrode can be formed. This is because in the design of flexible semiconductor devices in the prior art, there is a situation such as “it is necessary to consider the influence of the parasitic capacitance of the transistor, and it is desired to make the parasitic capacitance constant and minimal”. Is particularly advantageous.
- the present invention in the mask mode will be described in detail below.
- a method for manufacturing a flexible semiconductor device of the present invention according to an embodiment using a bank member as a “mask” Step of preparing metal foil (A) ', Step (B) ′ of forming an insulating layer including a portion to be a gate insulating film on a metal foil, A step of etching a part of the metal foil to form a source electrode and a drain electrode from the metal foil (C) ′, A step (D) ′ of forming a photocurable conductive paste layer by providing a photocurable conductive paste on the main surface of the insulating layer opposite to the side on which the semiconductor layer is formed; and Using the source electrode and the drain electrode as a mask, light is irradiated from the side where the source electrode and the drain electrode are formed, whereby a part of the photocurable conductive paste layer is cured to form a gate electrode.
- Process (E) ' It is characterized by comprising.
- One of the features of the manufacturing method of the present invention in the form of a mask is that light irradiation is performed using an electrode obtained by etching a metal foil as a mask, thereby partially curing the photocurable conductive paste layer. Forming another electrode. More specifically, light irradiation is performed using the source electrode and the drain electrode obtained by etching the metal foil as a mask, and thereby, the side of the main surface of the insulating layer opposite to the side on which the semiconductor layer is formed is formed. The photocurable conductive paste layer provided on the main surface is partially cured to form a gate electrode. As a result, the end face of the gate electrode coincides with the end face of the source electrode and the end face of the drain electrode in a self-aligning manner.
- one end surface of the source electrode and one end surface of the gate electrode have a positional relationship aligned or aligned with each other, and one end surface of the drain electrode and the other end surface of the gate electrode are aligned or aligned with each other. It will have a positional relationship.
- a semiconductor layer is formed on the main surface of the insulating layer so as to fit in the “gap” between the source electrode and the drain electrode.
- the light irradiation step (E) ′ is performed after the semiconductor layer is formed, light irradiation is performed through the semiconductor layer. In other words, light is irradiated toward the source electrode and the drain electrode, and the irradiated light is transmitted through the “semiconductor layer formed between the source electrode and the drain electrode”, whereby the photocurable conductive paste layer is formed. Partially cure.
- the source electrode and the drain electrode as bank members and to provide a semiconductor material in the gap between the source electrode and the drain electrode.
- a support substrate is provided on the insulating layer, or a layer of such a support substrate is formed.
- a part of the metal foil is etched to form a source electrode and a drain electrode from the metal foil.
- photolithography and wet etching may be performed on the metal foil so that the end surfaces facing each other across the “gap” of the surfaces formed by the source electrode and the drain electrode are inclined surfaces.
- the end surfaces of the source electrode and the drain electrode are inclined by wet etching so that the shape formed by the “gap” becomes a tapered shape.
- the support substrate disposed and formed on the insulating layer a ceramic substrate or a metal substrate may be used.
- the semiconductor layer and / or the gate insulating film can be positively subjected to heat treatment.
- the heat treatment can be performed on the semiconductor layer over the supporting substrate.
- the semiconductor layer is annealed by irradiating the semiconductor layer on the “support substrate made of a ceramic substrate or a metal substrate” with laser.
- the film quality or characteristics of the semiconductor layer can be changed, whereby the semiconductor characteristics can be improved (for example, the crystallinity of the semiconductor layer can be improved by “change in film quality”). ).
- the term “annealing” used here is substantially the same as heat treatment for the purpose of improving the crystallinity, crystallinity, and / or mobility, and stabilizing the characteristics. Meaning.
- the heat treatment of the insulating layer the gate insulating film is subjected to heat treatment after the step (B) ′.
- the insulating layer is annealed by irradiating the gate insulating film (insulating layer) with laser.
- the gate insulating film may be directly subjected to heat treatment (particularly annealing treatment), or when the semiconductor layer is heated, the insulating film is heated by heat generated in the semiconductor layer ( In particular, annealing may be performed.
- the manufacturing method of the present invention in a mask mode may further include a step of forming a resin film layer on the insulating layer so as to cover the semiconductor layer, the source electrode, and the drain electrode.
- a resin film layer is formed by, for example, bonding a resin film on an insulating layer, and at this time, a part of the resin film is fitted in a “gap”.
- a resin film layer precursor is used and bonded to a support substrate on which a source electrode / drain electrode is formed
- a part of the resin film layer precursor is “a source electrode located on the support substrate and Bonding while pressing so as to be embedded in the “gap between the drain electrode”.
- Such a resin film layer can be formed by a roll-to-roll method.
- an insulating layer including a gate insulating film is formed from an inorganic material.
- an insulating layer including a gate insulating film may be formed by a sol-gel method, or an insulating layer may be formed by local anodization of a valve metal forming a metal foil.
- a flexible semiconductor device that can be obtained by the above manufacturing method is also provided.
- the flexible semiconductor device of the present invention having such a mask aspect is as follows.
- An insulating layer having a portion to be a gate insulating film, and a source electrode and a drain electrode formed on the insulating layer and made of metal foil;
- a semiconductor layer is formed in the gap between the source electrode and the drain electrode, Of the main surface of the insulating layer, a gate electrode is formed on the main surface opposite to the side where the source electrode and the drain electrode are formed, One end face (or end part) of the source electrode and one end face (or end part) of the gate electrode are positioned in alignment with each other, and one end face (or end part) of the drain electrode and the gate electrode And the other end face (or end part) of each other are positioned in alignment with each other.
- One of the features of the present invention in such a mask mode is that the end face of the gate electrode is formed in a self-aligned manner with respect to the end faces of both the source electrode and the drain electrode.
- “formed in a self-aligned manner” means that the gate electrode and the source / drain electrodes are formed in a self-aligned manner. Without any special alignment measures for the electrode formation position, the "gate electrode” and the “source / drain electrode” necessarily have a desired relative positional relationship with the formation of these electrodes. Means an embodiment. More specifically, in the gate electrode and the source / drain electrodes formed so as to coincide in a self-aligned manner, one end face of the gate electrode and the end face of the source electrode are in the thickness direction of the flexible semiconductor device. And the other end face of the gate electrode and the end face of the drain electrode coincide in the thickness direction of the flexible semiconductor device.
- B is opposed to each other, ““ the contact C between one end face of the drain electrode ”and“ insulating layer ”, and“ the contact between “the other end face of the gate electrode” and “insulating layer”. D ”are opposed to each other.
- the “gap” between the source electrode and the drain electrode has a tapered shape, and therefore, the gap between the surfaces formed by the source electrode and the drain electrode.
- the end surfaces facing each other are inclined surfaces (more specifically, the end surfaces of the source electrode and the drain electrode are inclined so that the gap has a tapered shape).
- a resin film layer having flexibility is formed on the insulating layer so as to cover the semiconductor layer, the source electrode, and the drain electrode. And a protrusion fitted into the gap between the drain electrode and the drain electrode. More specifically, the “projection part of the resin film layer” is complementarily fitted in the “gap”. That is, the “projection part of the resin film layer” and the “gap between the source electrode and the drain electrode” have complementary shapes, and the projection part of the resin film layer has a gap (filling region of the semiconductor layer). Other gaps) are provided.
- the semiconductor layer in the mask-type flexible semiconductor device may include silicon, or may include an oxide semiconductor (for example, ZnO or InGaZnO).
- the gate insulating film is made of an inorganic material.
- the insulating layer including the gate insulating film may be obtained by locally oxidizing the metal foil.
- the metal foil may contain a valve metal, and the gate insulating film or the insulating layer may be an anodized film of the valve metal.
- the gate insulating film or insulating layer is an oxide film obtained by a sol-gel method.
- a further manufacturing method of the present invention relating to such a mask aspect is as follows: Step of preparing metal foil (A) ", Step (B) “of forming an insulating layer including a portion to be a gate insulating film on the metal foil A step (C) "of forming a photocurable conductive paste layer by providing a photocurable conductive paste on the main surface of the insulating layer opposite to the side on which the gate electrode is formed, A step of etching a part of the metal foil to form a gate electrode from the metal foil (D) ", and using the gate electrode as a mask, irradiating light from the side on which the gate electrode is formed; Step (E) of forming a source electrode and a drain electrode by curing a part of the photocurable conductive paste layer Comprising.
- light irradiation is performed using a gate electrode obtained by etching a metal foil as a mask, whereby the photocurable conductive paste layer is partially cured to form a source electrode. And forming a drain electrode. More specifically, light irradiation is performed using the gate electrode obtained by etching the metal foil as a mask, and thereby the main surface of the insulating layer on the main surface opposite to the side on which the gate electrode is formed.
- the provided photocurable conductive paste layer is partially cured to form a source electrode and a drain electrode. As a result, the end face of the source electrode and the end face of the drain electrode coincide with the end face of the gate electrode in a self-aligning manner.
- This further manufacturing method of the present invention has substantially the same mode as the above-described manufacturing method using the source / drain electrodes as a mask.
- a semiconductor layer is formed on the main surface of the insulating layer so as to fit in the gap between the source electrode and the drain electrode.
- the electrode and the drain electrode can be used as a “bank member”, and a semiconductor material can be provided in the gap between the source electrode and the drain electrode that function as the bank member.
- the method may further comprise a step of forming a resin film layer on the insulating layer so as to cover the layer, the source electrode, and the drain electrode, for example, by bonding the resin film on the insulating layer.
- a part of the resin film is fitted into the “gap between the source electrode and the drain electrode”.
- a resin film layer precursor is used and bonded to a support substrate on which a source electrode / drain electrode is formed
- a part of the resin film layer precursor is “a source electrode located on the support substrate and Bonding while pressing so as to be embedded in the “gap between the drain electrode”.
- Such a resin film layer can be formed by a roll-to-roll method.
- a support substrate may be provided on the metal foil, or a layer of such a support substrate may be formed. In other words, the support substrate is disposed on the metal foil.
- an insulating layer including a gate insulating film is formed from an inorganic material.
- an insulating layer including a gate insulating film may be formed by a sol-gel method, or an insulating layer may be formed by local anodization of a valve metal forming a metal foil.
- a flexible semiconductor device obtained by the manufacturing method using the gate electrode as a mask has the same characteristics as the above-described semiconductor device, and as a result, is similarly defined. That is, a flexible semiconductor device obtained by a manufacturing method using a gate electrode as a mask is An insulating layer having a portion to be a gate insulating film, and a source electrode and a drain electrode formed on the insulating layer and made of metal foil; A semiconductor layer is formed in the gap between the source electrode and the drain electrode, Of the main surface of the insulating layer, a gate electrode is formed on the main surface opposite to the side where the source electrode and the drain electrode are formed, One end surface of the source electrode and one end surface of the gate electrode are positioned in alignment with each other, and one end surface of the drain electrode and the other end surface of the gate electrode are positioned in alignment with each other (More specifically, “the source electrode and the drain electrode are formed so as to coincide with the gate electrode in a self-aligning manner”).
- Examples of the effect of the present invention in the mask mode include a “self-alignment effect”. That is, in the manufacturing method of the present invention in the mask mode, the electrode obtained by etching the metal foil is used as a mask for forming another electrode by photocuring, so that the mutual positional relationship between these electrodes is necessarily desired. It will satisfy the relationship. In other words, in the present invention of the mask mode, the “gate electrode” and the “source electrode / drain electrode” have a desired relative positional relationship with the electrode formation without taking any special alignment measures with respect to the electrode formation position.
- the electrode constituting the TFT is self-aligned (ie, “self-aligned”).
- one end face of the gate electrode and the end face of the source electrode are aligned in the thickness direction of the flexible semiconductor device, and the other end face of the gate electrode and the end face of the drain electrode are the thickness of the flexible semiconductor device. Match in the vertical direction.
- the end face of the gate electrode coincides with the end faces of both the source electrode and the drain electrode in a self-aligning manner, and the flexible semiconductor device has a self-aligned gate structure. ing. Therefore, in the present invention in the mask mode, the parasitic capacitance of the transistor formed in the overlap portion between the gate electrode and the drain electrode can be made constant and minimum.
- the source electrode and the drain electrode in a mask mode, can be used as a “mask”, and the source electrode and the drain electrode arranged with a gap therebetween can also be used as a “bank member”. That is, the source electrode and the drain electrode can be used not only as a “mask” but also as a “bank member for forming a semiconductor layer” as described above.
- Such an electrode can be finally used as a component of a flexible semiconductor device as a “source electrode” and a “drain electrode” of a TFT. This means that it is not necessary to finally remove or peel off the “bank member” that has contributed favorably to the semiconductor formation and the “mask” that has contributed to the electrode formation. Thus, productivity can be improved.
- FIG. 5A is a perspective view schematically showing the configuration of the flexible semiconductor device 100 in a mask mode.
- FIG. 5B is a schematic diagram showing the “self-aligned matching” mode, which is a feature of the mask mode.
- FIG. 5C is a diagram showing the relationship among the source 30 s, the channel 22 (20), and the drain 30 d of the flexible semiconductor device 100.
- the flexible semiconductor device 100 according to the present invention in the form of a mask is a flexible semiconductor device.
- the flexible semiconductor device 100 includes an insulating layer 10 having a portion to be a gate insulating film 10g, and a source electrode 30s and a drain electrode 30d formed of a metal foil 70.
- the source electrode 30 s and the drain electrode 30 d are formed on the insulating layer 10.
- a gap 50 exists between the source electrode 30s and the drain electrode 30d.
- the source electrode 30s and the drain electrode 30d arranged with the gap 50 interposed therebetween function as a “mask” and also function as a “bank member”. That is, “the source electrode 30s and the drain electrode 30d arranged with the gap 50 therebetween” contributes to the formation position of the gate electrode and functions as a positioning bank that determines the formation position of the semiconductor layer.
- the semiconductor layer 20 is formed so as to fill at least a part of the gap 50.
- the shape of the gap 50 can be seen through the semiconductor layer 20.
- the gate electrode 12 is formed on the main surface a of the main surface of the insulating layer 10 opposite to the side where the source electrode 30s and the drain electrode 30d are formed. Is formed.
- the end face 13 of the gate electrode 12 is formed so as to coincide with the end face 31s of the source electrode 30s and the end face 31d of the drain electrode 30d in a self-aligning manner. That is, in the flexible semiconductor device 100 of the present invention in the mask mode, the gate electrode 12, the source electrode 30s, and the drain electrode 30d are self-aligned because the gate electrode is used as a “mask” at the time of light irradiation.
- the flexible semiconductor device 100 of the present invention in a mask form has a self-aligned gate structure. That is, one end face (end face on the source electrode 30 s side) 13 of the gate electrode 12 and the end face 31 s of the source electrode 30 s coincide with each other in the substrate thickness direction (Z), while the other end face of the gate electrode 12 ( The drain electrode 30d side end face) 13 and the drain electrode 30d end face 31d coincide with each other in the substrate thickness direction (Z). More specifically, as shown in FIG. 5 (b), "" the contact A between the one end face of the source electrode "and” the insulating layer 10 "and” the "one end face of the gate electrode” and "insulation".
- a resin film layer (60) is formed on the insulating layer 10 so as to cover the semiconductor layer 20, the source electrode 30s, and the drain electrode 30d.
- the resin film layer 60 is represented by a dotted line (two-point difference line) for easy understanding of the gap 50.
- a part of the resin film layer 60 is a protrusion 65 that fits into the gap 50.
- the “projection 65 of the resin film layer 60” and the “gap 50” are fitted and joined to each other so as to have complementary shapes.
- the protrusion 65 and the gap 50 are fitted to each other, whereby the degree of adhesion between the “resin film layer 60” and the “structure including the source electrode 30s and the drain electrode 30d” can be improved. That is, due to the gap 50, the adhesion of the laminated structure of the flexible semiconductor device 100 is improved.
- the semiconductor layer 20 in the mask mode is obtained by making the “gap 50” function as a bank.
- the gap 50 functions as a “positioning bank” that determines the semiconductor layer formation position (see FIG. 4).
- the semiconductor layer 20 is made of silicon (Si)
- the liquid silicon is dropped into the gap 50 to form the semiconductor layer 20, but the gap 50 also plays a role of holding the liquid silicon. become.
- the gap 50 not only functions as a “positioning bank” for the semiconductor raw material but also has a function of holding the semiconductor raw material “storage bank”. Can also function.
- a semiconductor such as germanium (Ge) may be used, or an oxide.
- a semiconductor may be used.
- the oxide semiconductor include single oxides such as ZnO, SnO 2 , In 2 O 3 , and TiO 2 , and composite oxides such as InGaZnO, InSnO, InZnO, and ZnMgO.
- a compound semiconductor for example, GaN, SiC, ZnSe, CdS, GaAs, etc.
- organic semiconductors for example, pentacene, poly-3-hexylthiophene, porphyrin derivatives, copper phthalocyanine, C60, etc.
- pentacene poly-3-hexylthiophene, porphyrin derivatives, copper phthalocyanine, C60, etc.
- the insulating layer 10 including the gate insulating film 10g in the mask mode is made of an inorganic material.
- the gate insulating film 10g can be formed of a silicon oxide film (SiO 2 ) or a silicon nitride film. Note that the gate insulating film 10g can also be manufactured using a sol-gel method. Further, the gate insulating film 10g can be composed of an oxide film formed by anodizing the metal foil 70.
- the semiconductor layer 20 is formed on the gate insulating film 10g in the gap 50.
- the semiconductor layer 20 is in contact with the source electrode 30s and the drain electrode 30d.
- the gate insulating film 10g and the gate electrode 12 are located on the lower surface (bottom surface) of the semiconductor layer 20, the gate insulating film 10g and the gate electrode 12 are located. Therefore, a portion of the semiconductor layer 20 located between the source electrode 30s and the drain electrode 30d becomes the channel region 22, and a transistor (thin film transistor: TFT) is constructed by these elements.
- TFT thin film transistor
- the resin film layer 60 in the mask mode is made of a flexible resin material. More specifically, the resin film layer 60 can function as a support base material for supporting the transistor structure including the semiconductor layer 20, and is made of a thermosetting resin material or a thermoplastic resin material having flexibility after curing. It may be configured. Examples of such resin materials include epoxy resins, polyimide (PI) resins, acrylic resins, polyethylene terephthalate (PET) resins, polyethylene naphthalate (PEN) resins, polyphenylene sulfide (PPS) resins, and polyphenylene ether (PPE) resins. , Fluororesins such as PTFE, liquid crystal polymers, and composites thereof.
- PI polyimide
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PPS polyphenylene sulfide
- PPE polyphenylene ether
- the resin film layer 60 may be made of an organic-inorganic hybrid material containing polysiloxane or the like.
- the resin material as described above is excellent in the property of dimensional stability, and is preferable as a material for the flexible substrate in the flexible semiconductor device 100 of the present invention.
- FIGS. 6 (a) to (d), FIGS. 7 (a) to (c) and FIGS. 8 (a) to (b) the manufacturing of the flexible semiconductor device 100 according to the present invention in the mask mode is performed.
- a method will be described.
- 6A to 6D, FIGS. 7A to 7C, and FIGS. 8A to 8B are process cross-sectional views for explaining a method for manufacturing the flexible semiconductor device 100.
- step (A) ' is carried out. That is, as shown in FIG. 6A, a metal foil 70 is prepared.
- the metal foil 70 in the mask mode may be made of, for example, copper foil or aluminum foil.
- the thickness of the metal foil 70 is, for example, about 0.5 to 100 ⁇ m, preferably 2 to 20 ⁇ m.
- the insulating layer 10 is formed on the surface of the metal foil 70 (the thickness of the insulating layer 10 may be about 30 nm to 2 ⁇ m).
- the insulating layer 10 also includes a portion (10 g) that becomes a gate insulating film.
- the insulating layer 10 may be silicon oxide, for example. In such a case, for example, a silicon oxide thin film obtained by TEOS or the like may be formed.
- the insulating layer 10 having a portion that becomes a gate insulating film can be made of an inorganic material. That is, in a flexible semiconductor device using a resin base material as a supporting substrate, an organic insulating film can be used as a gate insulating film. However, in the present invention, a gate insulating film made of an inorganic material can be used. The transistor characteristics of the device 100 can be improved.
- a gate insulating film made of an inorganic material has a higher withstand voltage and a higher dielectric constant than a gate insulating film made of an organic material even if it is thin.
- the insulating layer 10 is formed on the surface of the metal foil 70, there are few process restrictions when the insulating layer 10 is manufactured. Therefore, in the present invention, a gate insulating film made of an inorganic material can be easily formed even when a gate insulating film of a flexible semiconductor device is manufactured. Further, even after the insulating layer 10 is formed on the metal foil 70, since the base is the metal foil 70, the insulating layer 10 can be annealed (heat treated) to improve the film quality.
- the insulating layer 10 can be formed by locally anodizing the surface region of the metal foil 70 (insulating layer formed by local anodization). May be about 30 nm to 200 nm). Anodization of aluminum can be easily performed using various chemical conversion liquids, thereby forming a very thin and dense oxide film.
- the chemical conversion solution a “mixed solution of tartaric acid aqueous solution and ethylene glycol” adjusted to have a pH near neutral with ammonia can be used.
- the metal foil 70 that can form the insulating layer 10 by anodic oxidation is not limited to aluminum, but may be any metal that has good electrical conductivity and can easily form a dense oxide. Metal).
- valve metal examples include at least one metal or alloy selected from the group consisting of aluminum, tantalum, niobium, titanium, hafnium, zirconium, molybdenum, and tungsten.
- a metal or alloy selected from the group consisting of aluminum, tantalum, niobium, titanium, hafnium, zirconium, molybdenum, and tungsten.
- the metal foil 70 is not limited to the valve metal (for example, aluminum), but may be any metal foil other than the valve metal as long as the metal surface is uniformly covered with an oxide film by oxidation. There may be.
- the oxidation method of the metal foil 70 can use thermal oxidation (surface oxidation treatment by heating) or chemical oxidation (surface oxidation treatment by an oxidizing agent) instead of anodic oxidation.
- the insulating layer 10 can be formed using a sol-gel method (the thickness of the insulating layer formed by the sol-gel method may be about 100 nm to 1 ⁇ m).
- the insulating layer 10 is made of, for example, a silicon oxide film.
- An example of a method for forming a silicon oxide film by a sol-gel method is as follows: a mixed solution of tetraethoxysilane (TEOS), methyltriethoxysilane (MTES), ethanol, and dilute hydrochloric acid (0.1 wt%) at room temperature for 2 hours.
- the colloidal solution (sol) prepared by stirring can be uniformly coated on a metal foil by a spin coating method, followed by heat treatment at 300 ° C. for 15 minutes.
- the sol-gel method has an advantage that not only a silicon oxide film but also a high dielectric constant gate insulating film such as a hafnium oxide film, an aluminum oxide film, or a titanium oxide film can be produced.
- a support substrate 72 is formed on the insulating layer 10.
- the support substrate 72 may be a ceramic substrate (for example, alumina (Al 2 O 3 ), zirconia (ZrO)), or a metal substrate (for example, a stainless substrate such as SUS304).
- a resin base material may be used as the support substrate 72.
- the support substrate 72 can be provided on the insulating layer 10 by attaching such a base material to the insulating layer 10 (using an adhesive as necessary).
- the source electrode 30 s and the drain electrode 30 d are formed from the metal foil 70 by etching a part of the metal foil 70. That is, step (C) ′ of the mask mode manufacturing method is performed.
- step (C) ′ of the mask mode manufacturing method is performed.
- the metal foil 70 is etched, since the support substrate 72 is formed on one surface of the insulating layer 10, the whole is held by the support substrate 72. In other words, even if the metal foil 70 is etched, the whole is not cut and broken.
- the formation of the source electrode 30s and the drain electrode 30d can be performed, for example, by a combination of photolithography and etching.
- the details are as follows. First, a photoresist material such as a dry film or a liquid type is formed on the entire surface of the metal foil 70. Next, pattern exposure and development are performed using a photomask having a pattern defining the shape and position of the source electrode 30s and the drain electrode 30d. Next, when the metal foil 70 is immersed in an etching solution using a photoresist having a pattern corresponding to the source electrode 30s and the drain electrode 30d as a mask, between the source electrode 30s and the drain electrode 30d and both electrodes (30s and 30d). A gap 50 located at is formed.
- the “source electrode and drain electrode arranged with a gap” is completed.
- an appropriate etchant can be selected and used depending on the type of metal foil. For example, when copper foil is used, a ferric chloride solution or a hydrogen peroxide / sulfuric acid solution can be used. In the case of an aluminum foil, a mixed solution of phosphoric acid, acetic acid and nitric acid can be used.
- the end surface 50b facing the gap 50 is an inclined surface.
- the periphery of the gap 50 includes a bottom surface 50a, a wall surface 50b, and an upper surface 50c, and the wall surface 50b is inclined.
- the bottom surface dimension w of the gap 50 as shown in FIG. 6D is preferably about 1 ⁇ m to 1 mm, more preferably about 10 ⁇ m to 300 ⁇ m.
- the height h of the gap 50 as shown in FIG. 6D is preferably about 0.5 ⁇ m to 100 ⁇ m, more preferably about 2 ⁇ m to 20 ⁇ m.
- the semiconductor layer 20 is formed in the gap 50 using the source electrode 30s and the drain electrode 30d as bank members (the thickness of the semiconductor layer 20 is about 30 nm to 1 ⁇ m). And preferably about 50 to 300 nm).
- the “source electrode and drain electrode arranged with the gap 50 therebetween” function as a bank member for positioning the semiconductor raw material / material, so that the semiconductor layer 20 can be preferably formed. it can.
- the semiconductor layer 20 is formed on the insulating layer 10 (the portion to be the gate insulating film 10g) to be the bottom surface 50a around the gap 50. In other words, the semiconductor layer 20 is formed so as to be accommodated in the gap 50.
- a semiconductor layer is formed by a thin film formation method or a printing method
- a provided semiconductor material is deposited in the gap 50, and the deposit can be used as a semiconductor layer. It will serve to determine the position (see FIG. 4). That is, the “source electrode and drain electrode arranged with the gap 50 therebetween” functions as a bank member for “positioning”.
- the thin film forming method include vacuum deposition, sputtering, and plasma CVD.
- the printing method include letterpress printing, gravure printing, screen printing, and ink jet.
- the “source and drain electrodes arranged with the gap 50 therebetween” function as a “positioning” bank member and also as a “storage” bank member. Function.
- the semiconductor layer 20 is formed as a silicon layer, as an example, a cyclic silane compound-containing solution (for example, a toluene solution of cyclopentasilane) is applied onto the bottom surface 50a of the gap 50 using a method such as inkjet, By performing heat treatment at 300 ° C., the semiconductor layer 20 made of amorphous silicon can be formed.
- a cyclic silane compound-containing solution for example, a toluene solution of cyclopentasilane
- the semiconductor layer 20 can be annealed.
- the film quality of the semiconductor layer 20 can be improved or modified.
- the support substrate 72 is a ceramic base material or a metal base material, it is excellent in heat resistance, so that there is substantially no problem even if a high temperature annealing treatment is performed. Even if the support substrate 72 is made of a resin base material, the support substrate 72 is finally removed. Therefore, even if the film quality of the support substrate 72 made of the resin base material is relatively deteriorated, the support substrate 72 If it functions as, it is possible to perform the annealing process of the semiconductor layer 20.
- the semiconductor layer 20 made of amorphous silicon is formed in the gap 50, it can be changed to polycrystalline silicon (for example, average grain size: about several hundred nm to 2 ⁇ m) after the annealing treatment.
- the semiconductor layer 20 is polycrystalline silicon, the crystallinity is improved by annealing treatment. Further, the mobility of the semiconductor layer 20 is improved due to the change in the film quality of the semiconductor layer 20, and the mobility is significantly different before and after the annealing process.
- the mobility of a-Si is ⁇ 1.0 (cm 2 / Vs).
- the mobility of ⁇ C-Si is about 3 (cm 2 / Vs), and the crystal grain size is 10 to 20 nm.
- the mobility of pC—Si polycrystalline silicon is about 100 (cm 2 / Vs) or about 10 to 300 (cm 2 / Vs), and the crystal grain size is 50 nm to 0.2 ⁇ m.
- the mobility of sC—Si is, for example, 600 (cm 2 / Vs) or more.
- annealing treatment in addition to a method of heat-treating the entire metal foil 70 on which the semiconductor layer 20 is formed, a method of heating the semiconductor layer 20 by irradiating the gap 50 with laser light may be adopted. It can.
- annealing is performed by irradiating laser light, for example, the following can be performed.
- an excimer laser (XeCl) having a wavelength of 308 nm can be irradiated with 100 to 200 shots at an energy density of 50 mJ / cm 2 and a pulse width of 30 nanoseconds. Note that specific annealing conditions are appropriately determined by comprehensively considering various factors.
- the heat treatment of the insulating layer 10 (particularly the gate insulating film 10g) may be performed. That is, the annealing process for the semiconductor layer 20 and the annealing process for the insulating layer 10 may be performed in the same process. Thereby, the film quality of the insulating layer 10 (especially the gate insulating film 10g) can also be changed. For example, when the semiconductor layer is heated, the gate insulating film 10g can also be heated due to the heat. When the insulating layer 10 is made of an oxide film (SiO 2 ) produced by thermal oxidation (wet oxidation) in water vapor, the insulating layer 10 is heated to reduce the electron trap level of the oxide film (SiO 2 ).
- wet oxidation is preferable because it has good productivity because the oxidation rate is about 10 times higher than dry oxidation, but it tends to increase the number of electron trap levels.
- dry oxidation although the generation of electron trap levels is small, the number of hole traps increases. Therefore, a gate oxide film with few electron traps and hole traps can be obtained with high productivity by heat-treating the oxide film formed by wet oxidation in an oxygen atmosphere.
- the resin film layer 60 is formed. That is, as shown in FIG. 7B, a light-transmitting resin film layer 60 (for example, an ultraviolet-transmissive resin film layer) is formed so as to cover the source / drain electrodes 30s and 30d and the semiconductor layer 20. . Thereby, the film laminated body (flexible substrate structure) 110 is obtained.
- a part of the resin film layer 60 is inserted into the gap 50. That is, the resin film layer 60 is formed so that the gap 50 is filled with the resin film material.
- the protrusion 65 fitted in the gap 50 in the resin film layer 60 is obtained.
- the protrusion 65 fits into the gap 50 as described above, thereby improving the adhesion between the resin film layer 60 and the transistor structure including the source / drain electrodes 30s and 30d.
- the angle ⁇ (see FIG. 6D) of the facing surface that defines the gap 50 is an obtuse angle
- a part of the resin film is in the gap 50 as compared with the case where the angle ⁇ is a right angle.
- the angle ⁇ is an obtuse angle
- the function of the source / drain electrodes 30s and 30d as a bank member can be enhanced when the semiconductor layer 20 is formed, as compared with the case where the angle ⁇ is a right angle.
- the alignment accuracy of the formed semiconductor layer 20 can be increased.
- the formation method of the resin film layer 60 is not particularly limited. For example, a method of bonding and curing a semi-cured resin film on the insulating layer 10 (even if an adhesive material is applied to the bonding surface of the resin sheet) Or a method of applying a liquid resin on the insulating layer 10 by spin coating or the like and curing it.
- the thickness of the formed resin film layer 60 is, for example, about 4 to 100 ⁇ m.
- a part of the resin film can be provided to the “gap 50 between the source electrode and the drain electrode” by pressurizing the resin film at the time of bonding. A part of the film layer can be fitted into the gap 50.
- a “resin film provided in advance with a convex portion having a shape substantially complementary to the shape of the gap 50” may be used as a resin film used for bonding.
- the resin sheet portion thickness may be about 2 to 100 ⁇ m, and the adhesive material portion thickness may be about 3 to 20 ⁇ m.
- the bonding conditions can be appropriately determined according to the curing characteristics of the resin film material and the adhesive material. For example, when using a resin film in which an epoxy resin is applied as an adhesive material (thickness: about 10 ⁇ m) to the bonding surface of a polyimide film (thickness: about 12.5 ⁇ m), first, a metal foil and a resin film are laminated. Then, it is heated to 60 ° C. and temporarily pressure-bonded under a pressure of 3 MPa. Then, the adhesive material is fully cured at 140 ° C. and 5 MPa for 1 hour.
- the semiconductor layer 20 can be protected, and handling and conveyance of the next process (such as patterning processing of the metal foil 70) can be stably performed. .
- the support substrate 72 is removed from the film laminate 110.
- the resin film layer 60 can serve as a support base material.
- step (D) ' is performed. That is, as shown in FIG. 7C, the photocurable conductive paste layer 11 is formed by applying a photocurable conductive paste on the insulating layer 10 including the gate insulating film 10g. More specifically, a photocurable conductive paste is supplied to the main surface a on the opposite side of the main surface of the insulating layer 10 from the side on which the semiconductor layer 20 is formed. (The thickness of the conductive paste layer 11 may be about 50 nm to 20 ⁇ m).
- the conductive paste used may be a conventional photo-curable paste, for example, an ultraviolet curable paste material (for example, Ag paste) can be used (specifically, “Ag paste” is about 10 nm to 20 ⁇ m). Ag particles, a resin capable of initiating photopolymerization such as epoxy acrylate resin, and a viscosity adjusting solvent such as ethyl cellulose (EC)).
- the application of the conductive paste can be performed, for example, by printing the entire surface on the insulating layer 10.
- the formation of the conductive paste layer 11 can also be performed by applying it around the gate insulating film 10g by using a printing method such as screen printing, gravure printing, or inkjet method.
- step (E) ' is performed. Specifically, as shown in the drawing, light is irradiated from the side where the source electrode 30s and the drain electrode 30d are formed using the source electrode 30s and the drain electrode 30d as a mask.
- the irradiation light 62 passes through the resin film layer 60 and hardens the conductive paste layer 11 in the channel portion through the space between the source electrode 30s and the drain electrode 30d.
- the gate electrode 12 is formed by curing the conductive paste layer.
- the irradiation light 62 light having a wavelength that transmits the resin film layer 60, the gate insulating film 10, and the semiconductor layer 20 and cures the conductive paste layer 11 is used.
- the wavelength of the irradiation light can be selected so as to transmit the resin film layer, the gate insulating film, and the semiconductor layer and to cure the conductive paste.
- the resin film layer 60 is made of acrylic resin (PMMA) or polycarbonate (PC)
- the gate insulating film is made of silicon oxide
- the semiconductor layer 20 is made of InGaZnO
- light having a wavelength of about 436 nm Since so-called g-line) can be transmitted, the photocurable conductive paste layer 11 can be cured by irradiation with the light.
- a part of the conductive paste layer 11 is cured using the source electrode 30s and the drain electrode 30d as a mask, so that the end face 31s of the source electrode 30s and the end face 13 of the gate electrode 12 are made to coincide.
- the end face 31d of the drain electrode 30d and the end face 13 of the gate electrode 12 can be made to coincide with each other. That is, in this irradiation step, a self-aligned gate structure can be manufactured.
- the end face 13 of the gate electrode 12 is aligned with the end faces (31s and 31d) of the source and drain electrodes in a self-aligned manner by irradiation with light 62 using the source and drain electrodes as a mask.
- the hardened region of the conductive paste 11 is slightly expanded by the heat generated by the irradiation of the light 62, and the end face 13 of the gate electrode 12 and the end faces (31s and 31d) of the source / drain electrodes are strictly speaking. There may be cases where they do not match. However, in the present embodiment, it is assumed that it is formed so as to match in a self-aligned manner (including self-alignment) including a slight spread in the actual process.
- the source / drain electrodes 30 s and 30 d functioning as a mask for the gate electrode 12 cause diffraction or scattering of the light 62, thereby causing a slight change in the cured region of the conductive paste 11.
- the 12 end faces 13 may not exactly coincide with the end faces (31s and 31d) of the source / drain electrodes. Even in this case, it is assumed that it is formed so as to match in a self-aligned manner (including self-alignment) including an error in an actual process.
- the “gap” has a forward taper shape that widens toward the light source side.
- the “gap” having such a forward taper shape the following advantageous effects can be obtained. For example, as shown in FIG.
- the gate A portion where the electrode 12 is formed is smaller than the semiconductor layer 20, and there may be a problem that a channel portion (formed corresponding to the gate electrode) is not formed on the entire surface of the semiconductor layer. In such a case, the resistance between the source electrode and the drain electrode when the transistor is turned on increases.
- the semiconductor layer portion 20 and the gate electrode 12 coincide with each other, and such a problem cannot occur.
- the flexible semiconductor device 100 according to the present invention in the mask mode can be obtained.
- a resin film layer (not shown) may be formed on the insulating layer 10 so as to cover the gate electrode 12 thereafter.
- the gate electrode 12 can be formed by curing a part of the conductive paste layer 11 using the source electrode 30s and the drain electrode 30d as a mask. Therefore, the positional relationship among the gate electrode 12, the source electrode 30s, and the drain electrode 30d can be automatically determined without using mask alignment that is likely to cause errors. With such a self-aligned gate structure, the overlap between the three electrodes can be made constant and minimal. As a result, the parasitic capacitance of the transistor formed in the overlap portion between the gate electrode 12 and the drain electrode 30d is made constant and Can be minimized. That is, according to the present invention in the mask mode, the image quality and its uniformity / reliability characteristics can be improved. In addition, since mask alignment becomes difficult as the area increases, the necessity for gate self-alignment increases.
- the gate electrode is formed by the self-alignment method using the source electrode and the drain electrode as a mask, but in the opposite mode, the gate electrode is used as a mask.
- the source electrode and the drain electrode can be formed by a self-alignment method.
- FIGS. 10A to 10D, FIGS. 11A to 11C, and FIGS. 12A to 12B are process cross-sectional views for explaining a method of manufacturing the flexible semiconductor device 100 '.
- a metal foil 70 is prepared. That is, the step (A) "of the manufacturing method of the present invention is performed.
- the metal foil 70 may be made of, for example, a copper foil or an aluminum foil.
- the step (B) As shown in FIG. 10B, the insulating layer 10 is formed on the surface of the metal foil 70.
- the insulating layer 10 also includes a portion (10 g) that becomes a gate insulating film.
- a photocurable conductive paste layer 11 is formed on the insulating layer 10 by applying a photocurable conductive paste. That is, the step (C) "is carried out. Specifically, a photocurable conductive paste is provided on the main surface b on the opposite side of the main surface of the insulating layer from the side on which the gate electrode is formed. A photocurable conductive paste layer 11 is formed, and then a support substrate 73 is formed on the conductive paste layer 11 as shown in Fig. 10D. However, as described above, a ceramic base material or a metal base material may be used as the support substrate 73.
- the metal foil 70 is etched to form the gate electrode 12. Specifically, the metal foil 70 is subjected to photolithography and wet processing. Etching is performed to form the gate electrode 12. Then, as shown in FIG.11 (b), light (for example, UV light) 63 is irradiated from the gate electrode side. To implement. Specifically, as shown in the figure, the gate electrode 12 is used as a part of the mask, and light is irradiated from the side where the gate electrode 12 is formed toward the conductive paste layer 11. Thereby, the conductive paste layer 11 can be partially irradiated through the insulating layer 10, and the irradiated layer 11 can be cured. The cured portions become the source electrode 30s and the drain electrode 30d. As the irradiation light 63, light having a wavelength capable of transmitting the insulating layer 10 and curing the conductive paste layer 11 is used.
- the irradiation light 63 light having a wavelength capable of transmitting the insulating layer 10 and curing the conductive paste
- the end surface 13 of the gate electrode 12 and the end surface 31 s of the source electrode 30 s can be made to coincide with each other.
- the end face 13 and the end face 31d of the drain electrode 30d can be matched. That is, in this irradiation step, a self-aligned gate structure can be manufactured. In this self-aligned gate structure, as described above, there is a possibility that a slight error may occur in matching between the end faces (13, 31s, 31d) due to light diffraction / scattering.
- the support substrate 73 is removed.
- the source electrode 30s and the drain electrode 30d are used as bank members, and between the electrodes (30s and 30d).
- the semiconductor layer 20 is formed.
- a resin film layer 60 covering the semiconductor layer 20 and the source / drain electrodes (30s, 30d) is formed. A part of the resin film layer 60 becomes a fitting portion 65 that enters the gap 50 between the source / drain electrodes (30s, 30d).
- the flexible semiconductor device 100 ′ can be obtained through the above steps.
- Such a manufacturing method can also form a self-aligned gate structure. That is, the source electrode 30 s and the drain electrode 30 d can be formed by partially curing the conductive paste layer 11 using a part of the gate electrode 12 as a mask. Therefore, the positional relationship among the gate electrode 12, the source electrode 30s, and the drain electrode 30d can be automatically determined without using mask alignment that is likely to cause errors.
- a circuit 90 illustrated in FIG. 13 is a drive circuit mounted on an image display device (here, an organic EL display), and represents a configuration of one pixel of the image display device here.
- Each pixel of the image display apparatus of this example is configured by a circuit of a combination of two transistors (100A, 100B) and one capacitor 85.
- This drive circuit includes a switching transistor (hereinafter referred to as “Sw-Tr”) 100A and a driving transistor (hereinafter referred to as “Dr-Tr”) 100B.
- Both transistors (100A , 100B) is composed of the flexible semiconductor device 100 of the present invention.
- the capacitor 85 can be formed in part of the structure of the flexible semiconductor device 100.
- the insulating layer 10 of this embodiment may be used as a dielectric layer of the capacitor 85.
- the gate electrode of the Sw-Tr 100A is connected to the selection line 94.
- One of the source electrode and the drain electrode of the Sw-Tr 100A is connected to the data line 92, and the other is connected to the gate electrode of the Dr-Tr 100B.
- one of the source electrode and the drain electrode of the Dr-Tr 100B is connected to the power supply line 93, and the other is connected to the display unit (here, an organic EL element) 80.
- the capacitor 85 is connected between the source electrode and the gate electrode of the Dr-Tr 100B.
- the drive voltage is input from the data line 92 and is selected by the Sw-Tr 100A. Is accumulated. A voltage generated by the charge is applied to the gate electrode of the Dr-Tr 100B, and a drain current corresponding to the voltage is supplied to the display unit 80, thereby causing the display unit (organic EL element) 80 to emit light. ing.
- FIGS. 14A and 14B show a laminated structure 200 in which a circuit 90 is constructed by the flexible semiconductor device 100 (100A, 100B) of this embodiment.
- the flexible semiconductor device 100A is disposed on the upper side, and the flexible semiconductor device 100B is disposed on the lower side.
- the drain electrode 30d of the flexible semiconductor device 100A is connected to the gate electrode 12 of the flexible semiconductor device 100B through a via 82.
- the drain electrode 30 d of the flexible semiconductor device 100 ⁇ / b> A is connected to the upper electrode 85 a of the capacitor 85 through the via 82.
- the dielectric layer of the capacitor 85 is the same layer 10 as the gate insulating film 10g of the flexible semiconductor device 100B.
- the lower electrode 85a of the capacitor 85 is an electrode extending from the source electrode 30s of the flexible semiconductor device 100B.
- the drain electrode 30d of the flexible semiconductor device 100B is connected to the wiring 84 via the via 82.
- the protrusion 65A of the resin film 60A is inserted into the gap 50 of the flexible semiconductor device 100A.
- the protrusion 65B of the resin film 60B is inserted into the gap 50 of the flexible semiconductor device 100B.
- Each protrusion 65 (65A, 65B) also forms a gap 50 and a fitting structure. Therefore, in the configuration shown in this example, since the periphery of the channel portion of each flexible semiconductor device 100 (100A, 100B) is used as a fitting structure, it is not necessary to separately form a fitting structure for improving adhesiveness. It has the advantage of being good. As can be seen from FIG.
- both the flexible semiconductor devices 100A and 100B have a self-aligned gate structure. That is, in the present invention in the mask mode, the end face 13 of the gate electrode 12 and the end face 31s of the source electrode 30s and the end face 31d of the drain electrode 30d coincide.
- FIG. 15A (a) and (b) to FIG. 15E (a) and (b) are plan views schematically showing respective layers (101 to 105) of a laminated structure 200 of another example.
- FIG. 16 (a) is a part (enlarged view) of a sectional view taken along line VII-VII in FIGS. 15A (a) to 15E (a), while FIGS. 15A (b) to 15E (b).
- FIG. 6 is a part (enlarged view) of a sectional view taken along line XI-XI in FIG. FIG.
- FIG. 17 (a) is a part (enlarged view) of a sectional view taken along line VIII-VIII in FIGS. 15A (a) to 15E (a), while FIG. FIG. 16B is a part (enlarged view) of a sectional view taken along line XII-XII in FIG. 15E (b).
- the gate electrode 12 is disposed.
- 15B (a) and (b) are provided with the source electrode 30s, the drain electrode 30d, and the semiconductor layer 20 located between them (30s, 30d).
- a gate electrode 12 and a via 82 are arranged in the layer 103 shown in FIGS. 15C (a) and (b).
- a layer 104 shown in FIGS. 15D (a) and 15 (b) is provided with a source electrode 30s, a drain electrode 30d, and a semiconductor layer 20 located between (30s, 30d) therebetween.
- wirings 84 and vias 82 are arranged in the layer 101 shown in FIGS. 15A (a) and (b).
- the protrusion 65A of the resin film 60A is fitted in the gap 50 of the flexible semiconductor device 100A, while the protrusion 65B of the resin film 60B is The flexible semiconductor device 100B is fitted in the gap 50.
- the dielectric layer 10 of the capacitor 85 is a common layer with the gate insulating film 10g of the flexible semiconductor device 100B.
- both the flexible semiconductor devices 100A and 100B have a self-aligned gate structure.
- FIG. 18 is a cross-sectional view of an OLED (organic EL) image display device 300 in which three colors of R (red), G (green), and B (blue) are arranged in three pixels on the flexible semiconductor device of the present invention.
- the semiconductor device only the resin film and the pixel electrode (cathode) are shown.
- the light emitting layer 170 made of a light emitting material corresponding to each color is disposed on the pixel electrode 150 of each of the R, G, and B pixels.
- a pixel restricting portion 160 is formed between adjacent pixels to prevent light emitting materials from being mixed and at the same time to facilitate positioning when arranging the EL material.
- a transparent electrode layer (anode layer) 180 is formed on the upper surface of the light emitting layer 170 so as to cover the entire pixels.
- the material used for the pixel electrode 150 may be a metal such as Cu.
- the charge injection layer for improving the charge injection efficiency to the light emitting layer 170 and the light from the light emitting layer are reflected to increase the light extraction efficiency upward. Therefore, the surface may have a laminated structure with 0.1 ⁇ m of Al (for example, Al / Cu) as a reflective electrode.
- the material used for the light-emitting layer 170 is not particularly limited.
- a polyfluorene-based light-emitting material and a substance having a tree-like multi-branched structure use a heavy metal such as Ir or Pt at the center of a dendron skeleton of a so-called dendrimer.
- a dendrimer-based light emitting material can be used.
- the light emitting layer 170 may have a single layer structure, but in order to facilitate charge injection, MoO 3 is used as a hole injection layer and LiF is used as an electron injection layer, and a stacked structure such as an electron injection layer / light emitting layer / hole injection layer is used. It is good. ITO can be used for the transparent electrode 180 of the anode.
- the pixel restricting portion 160 may be any insulating material, but for example, a photosensitive resin mainly composed of polyimide or SiN can be used.
- the image display device may have a color filter as shown in FIG.
- a flexible semiconductor device 100 a plurality of pixel electrodes 150 formed on the flexible semiconductor device 100, a light emitting layer 170 formed so as to entirely cover the pixel electrodes 150, and A transparent electrode layer 180 formed on the light emitting layer 170 and a color filter 190 formed on the transparent electrode layer 180 are provided.
- the color filter 190 has a function of converting the light from the light emitting layer 170 into three colors of red, green, and blue, so that R (red) G (blue) B Three (blue) pixels can be configured. That is, in the image display device 300 shown in FIG.
- each light emitting layer divided by the pixel restricting unit emits red, green, and blue separately, whereas in the image display device 300 ′ in FIG. 19,
- the light emitted from the light emitting layer itself has no distinction of color (for example, it is white light), but the light passes through the color filter 190 to generate red, green, and blue light. Yes.
- a flexible semiconductor device 100 including a pixel electrode 150 is prepared.
- the pixel electrode 150 can be formed by patterning the metal foil (that is, the metal foil provided on the flexible film layer is partially removed through photolithography or the like).
- the pixel electrode 150 can also be formed by applying a pixel electrode raw material to a predetermined location by a printing method or the like.
- an “image display unit composed of a plurality of pixels” is formed on the flexible semiconductor device.
- a plurality of pixel restricting portions 160 are formed on the flexible semiconductor device 100, and the regions partitioned by the plurality of pixel restricting portions 160 and the pixel electrodes 150 are formed.
- a light emitting layer 170 is formed.
- the pixel regulation layer 160 is formed so as to cover the entire pixel electrode with a photosensitive resin material mainly composed of polyimide to form a precursor layer 160 ′ of the pixel regulation part, and then the precursor layer 160 ′ is formed on the precursor layer 160 ′.
- the light emitting layer 170 of a predetermined color is formed on a predetermined pixel electrode.
- a method for forming the light-emitting layer 170 for example, a polyfluorene-based light-emitting material can be dissolved in xylene to form a 1% solution, which can be disposed on the pixel electrode by an ink-jet method.
- the thickness of the light emitting layer 170 can be about 80 nm.
- a transparent conductive layer 180 (for example, an ITO film) is formed so as to cover the light emitting layer 170.
- the ITO film of the transparent conductive layer can be formed by sputtering.
- the image display apparatus 300 having the structure shown in FIG. 20 (e) and FIG. 18 can be constructed through the above processes.
- a manufacturing mode of the image display device 300 ′ having a color filter will be described.
- Such a manufacturing mode is substantially the same as the above manufacturing method, although there are some differences.
- the white light emitting layer 170 is formed in a solid film shape on the entire surface (see FIG. 21B).
- the transparent electrode layer 180 is formed in the same manner as described above (see FIG. 21C).
- the three colors R (red), G (green), and B (blue) of the color filter 190 are placed at desired pixel positions.
- FIG. 21D the image display device 300 ′ can be completed.
- FIG. 22 shows a mode in which the flexible semiconductor device 100 of this embodiment is manufactured by a roll-to-roll method.
- a structure including a support substrate 72 on which a transistor (TFT) including the semiconductor layer 20 is formed (that is, in FIG. 3A or FIG. 7A).
- the structure shown) is passed between the pair of rollers 220A and 220B together with the resin film 60.
- a film laminate 110 (that is, the structure shown in FIG. 3B or FIG. 7B) in which the “support substrate 72 on which the transistor is formed” and the “resin film 60” are integrated is obtained. It is done.
- a support substrate 72 (a structure shown in FIG. 3A or FIG. 7A) on which a transistor (TFT) is formed proceeds in the direction of an arrow 201.
- the resin film 60 is unwound from the roller 210 (see arrow 215) and proceeds in the direction of the arrow 202 along the auxiliary roller 212.
- the metal foil 70 and the resin film 60 are laminated and integrated between the heat and pressure rollers (220A, 220B) that rotate as indicated by an arrow 225.
- a part (65) of the resin film 60 is inserted into the gap 50 to form a fitting structure.
- the metal foil with a resin film (film laminate) 110 is wound around a roller 230 (see arrow 235).
- the support substrate 72 is made of a metal material and the gate electrode 12 is manufactured by patterning the support substrate 72, the flexible semiconductor device 100 is completed through an etching process (not shown) for performing the patterning.
- the roller 230 can be wound up.
- FIGS. 23A and 23B show a cross section of a part 250 of the film laminate 110 wound around the roller 230.
- FIG. As shown in the drawing, since the source / drain electrodes 30 are laminated on the inner side of the resin film 60, the source / drain electrodes 30 are compressed and the resin film 60 is pulled. As a result, the source / drain electrodes 30 and the resin film 60 have different strain magnitudes, and shear stress is generated at the interface, which causes peeling. In the case of a normal laminated structure, the occurrence of peeling is suppressed by the adhesive force between the source / drain electrodes 30 (patterned metal foil 70) and the resin film 60. However, according to the configuration of the present invention, since the fitting structure (50, 65) firmly holds the laminated structure in addition to the adhesive force, the adhesion is improved and the occurrence of peeling or the like is prevented or alleviated. be able to.
- the metal foil 70 is unwound from an initial roller (not shown), and all (or part of) the steps shown in FIGS. 2 (a) to 3 (c) are performed on the roller, chamber, and etching. It is also possible to execute continuously using a tank or the like.
- the semiconductor layer can be easily and effectively modified.
- modification can be performed when the semiconductor layer 20 is made of an oxide semiconductor.
- a crystalline oxide semiconductor such as ZnO contains many amorphous layers in the crystalline layer immediately after film formation by sputtering or the like, and thus does not exhibit characteristics as a semiconductor device. There are many.
- the state shown in FIG. 3A or 7A that is, the state in which the gap 50 is filled with a semiconductor material (here, an oxide semiconductor) is a flexible state.
- the annealing process and the laser irradiation process are performed. It can be executed without major restrictions. By performing such a process, the crystallinity of an oxide semiconductor such as ZnO can be improved, and as a result, semiconductor characteristics can be improved.
- an amorphous oxide semiconductor such as InGaZnO can have an effect of improving semiconductor characteristics.
- oxygen vacancies are repaired by laser irradiation in an oxygen atmosphere (for example, in the air) in a state where the gap 50 is filled with a semiconductor material (here, an amorphous oxide semiconductor).
- a semiconductor material here, an amorphous oxide semiconductor
- the conductivity of the oxide semiconductor It is also possible to control the conductivity of the oxide semiconductor.
- oxygen vacancies When there are many oxygen vacancies in the oxide semiconductor, it means that there are a lot of transmission electrons (that is, the carrier concentration is high), and therefore the conductivity is high.
- the oxide semiconductor Conductivity control can be performed. Note that even in H plasma (hydrogen plasma) treatment, a reducing atmosphere is formed, and oxygen vacancies can be easily generated in the oxide semiconductor.
- the present invention described above includes the following aspects: 1st aspect: It is a flexible semiconductor device, Comprising: Gate electrode, An insulating layer provided on the gate electrode and having a portion to be a gate insulating film; and a source electrode and a drain electrode formed on the insulating layer and made of metal foil; There is a gap between the source electrode and the drain electrode, whereby the source electrode and the drain electrode arranged across the gap are bank members, A semiconductor layer is formed in the gap; A resin film layer is formed on the insulating layer so as to cover the semiconductor layer, the source electrode, and the drain electrode, and the resin film layer is provided with a protruding portion that fits into the gap.
- Semiconductor device Comprising: Gate electrode, An insulating layer provided on the gate electrode and having a portion to be a gate insulating film; and a source electrode and a drain electrode formed on the insulating layer and made of metal foil; There is a gap between the source electrode and the drain electrode, whereby the source electrode and the drain electrode
- Second aspect The flexible semiconductor device according to the first aspect, wherein, of the surfaces formed by the source electrode and the drain electrode, end surfaces facing each other with the gap therebetween form an inclined surface.
- Sixth aspect The flexible semiconductor device according to the fifth aspect, wherein the oxide semiconductor is ZnO or InGaZnO.
- the gate insulating film is formed of an inorganic material.
- the metal foil includes a valve metal, and the gate insulating film is an anodic oxide film of the valve metal.
- An image display device using the flexible semiconductor device according to any one of the first to eighth aspects The flexible semiconductor device; and an image display unit composed of a plurality of pixels formed on the flexible semiconductor device, There is a gap between the source electrode and the drain electrode of the flexible semiconductor device, whereby the source electrode and the drain electrode arranged across the gap are bank members, An image display device, wherein a semiconductor layer of the flexible semiconductor device is formed in the gap, and a protrusion fitted into the gap is provided in a resin film layer of the flexible semiconductor device.
- the image display unit is A pixel electrode formed on the flexible semiconductor device; An image display device comprising: a light emitting layer formed on the pixel electrode; and a transparent electrode layer formed on the light emitting layer.
- Eleventh aspect The image display apparatus according to the tenth aspect, wherein the light emitting layer is formed in a region partitioned by a pixel restricting portion.
- Twelfth aspect The image display apparatus according to the tenth aspect, further comprising a color filter on the transparent electrode layer.
- a method of manufacturing a flexible semiconductor device Preparing a metal foil (A), Forming an insulating layer including a portion to be a gate insulating film on the metal foil (B), Forming a support substrate on the insulating layer (C); Etching a part of the metal foil to form a source electrode and a drain electrode from the metal foil (D), A step (E) of forming a semiconductor layer in a gap located between the source electrode and the drain electrode using the source electrode and the drain electrode as a bank member; and the semiconductor layer, the source electrode, and the drain electrode Forming a resin film layer on the insulating layer so as to cover (F) Comprising In the step (F), a part of the resin film layer is fitted into the gap between the source electrode and the drain electrode.
- step (D) photolithography and wet etching are performed on the metal foil to sandwich the gap among the surfaces formed by the source electrode and the drain electrode.
- a method of manufacturing a flexible semiconductor device wherein the opposite end surfaces are inclined surfaces.
- Fifteenth aspect A method for manufacturing a flexible semiconductor device according to the thirteenth or fourteenth aspect, wherein the step (F) is performed by a roll-to-roll method.
- a method for manufacturing a flexible semiconductor device is performed using any one of the thirteenth to fifteenth aspects.
- Seventeenth aspect A method of manufacturing a flexible semiconductor device according to any one of the thirteenth to sixteenth aspects, wherein a ceramic base or a metal base is used as the support substrate.
- Eighteenth aspect A method for manufacturing a flexible semiconductor device according to any one of the thirteenth to seventeenth aspects, wherein the gate insulating film is formed by a sol-gel method in the step (B).
- Nineteenth aspect The method for manufacturing a flexible semiconductor device according to the seventeenth aspect, wherein the gate insulating film is subjected to heat treatment after the step (B).
- Twenty aspect A method for manufacturing a flexible semiconductor device according to the seventeenth or nineteenth aspect, wherein the semiconductor layer is subjected to heat treatment after the step (E).
- a metal base material is used as the support substrate, and after the step (F), the metal base material is patterned to form a gate electrode.
- a method for manufacturing a flexible semiconductor device Twenty-second aspect: a flexible semiconductor device, An insulating layer having a portion to be a gate insulating film; and a source electrode and a drain electrode formed on the insulating layer and made of metal foil.
- a semiconductor layer is formed in a gap between the source electrode and the drain electrode;
- a gate electrode is formed on the main surface opposite to the side on which the source electrode and the drain electrode are formed, One end face of the source electrode and one end face of the gate electrode are positioned in alignment with each other, and one end face of the drain electrode and the other end face of the gate electrode are aligned with each other.
- a flexible semiconductor device is located. Twenty-third aspect: In the twenty-second aspect, the end face of the gate electrode is formed so as to coincide with the end faces of both the source electrode and the drain electrode in a self-aligning manner. Flexible semiconductor device.
- Twenty-fourth aspect In the twenty-second aspect, a contact A between the one end face of the source electrode and the insulating layer, and a contact B between the one end face of the gate electrode and the insulating layer are mutually connected. As opposed to A flexible semiconductor device characterized in that a contact C between the one end face of the drain electrode and the insulating layer and a contact D between the other end face of the gate electrode and the insulating layer are opposed to each other. .
- Twenty-fifth aspect In any one of the twenty-second to twenty-fourth aspects, among the surfaces formed by the source electrode and the drain electrode, end surfaces facing each other across the gap form an inclined surface. Flexible semiconductor device.
- Twenty-sixth aspect In any one of the twenty-second to twenty-fifth aspects, a resin film layer is formed on the insulating layer so as to cover the semiconductor layer, the source electrode, and the drain electrode.
- the flexible semiconductor device, wherein the projection of the film layer and the gap between the source electrode and the drain electrode have complementary shapes.
- Twenty-seventh aspect The flexible semiconductor device according to any one of the twenty-second to twenty-sixth aspects, wherein the semiconductor layer includes silicon.
- Twenty-eighth aspect The flexible semiconductor device according to any one of the twenty-second to twenty-sixth aspects, wherein the semiconductor layer includes an oxide semiconductor.
- Twenty-ninth aspect The flexible semiconductor device according to the twenty-eighth aspect, wherein the oxide semiconductor is ZnO or InGaZnO.
- the oxide semiconductor is ZnO or InGaZnO.
- the gate insulating film is formed of an inorganic material.
- Thirty-first aspect The flexible semiconductor according to any one of the twenty-second to twenty-ninth aspects, wherein the metal foil includes a valve metal, and the gate insulating film is an anodic oxide film of the valve metal. apparatus.
- the flexible semiconductor device uses the flexible semiconductor device according to any one of the twenty-second to thirty-first aspects, The flexible semiconductor device; and an image display unit composed of a plurality of pixels formed on the flexible semiconductor device, In the flexible semiconductor device, one end face of the source electrode and one end face of the gate electrode are positioned in alignment with each other, and one end face of the drain electrode and the other end face of the gate electrode are mutually connected.
- the image display apparatus according to the thirty-third aspect, wherein the light emitting layer is formed in a region partitioned by a pixel restricting portion.
- a thirty-sixth aspect is a method of manufacturing a flexible semiconductor device, Step of preparing metal foil (A) ', Forming an insulating layer including a portion to be a gate insulating film on the metal foil (B) ′; Etching a part of the metal foil to form a source electrode and a drain electrode from the metal foil (C) ′, A step (D) ′ of forming a photocurable conductive paste layer by providing a photocurable conductive paste on the main surface of the insulating layer opposite to the side on which the semiconductor layer is formed; And using the source electrode and the drain electrode as a mask, irradiating light from the side on which the source electrode and the drain electrode are formed, thereby curing a part of the photocurable conductive paste layer.
- Step (E) ′ for forming gate electrode A method for manufacturing a flexible semiconductor device, comprising: Thirty-seventh aspect: In the thirty-sixth aspect, after the step (C) ′, a semiconductor layer is formed on the main surface of the insulating layer so as to fit in the gap between the source electrode and the drain electrode. And In the step (E) ′, a part of the photocurable conductive paste layer is cured by transmitting the irradiated light through the semiconductor layer, and a method for manufacturing a flexible semiconductor device .
- the source electrode and the drain electrode are used as bank members, and a semiconductor material is provided in a gap between the source electrode and the drain electrode.
- a method for manufacturing a flexible semiconductor device characterized in that: Thirty-ninth aspect: In any one of the thirty-sixth to thirty-eight aspects, in step (C) ′, photolithography and wet etching are performed on the metal foil to form a surface formed by the source electrode and the drain electrode.
- step (C) ′ photolithography and wet etching are performed on the metal foil to form a surface formed by the source electrode and the drain electrode.
- a method for manufacturing a flexible semiconductor device characterized in that end surfaces facing each other are inclined surfaces.
- a resin film layer is formed on the insulating layer so as to cover the semiconductor layer, the source electrode, and the drain electrode.
- a method for manufacturing a flexible semiconductor device further comprising a step.
- Forty-first aspect In the fortieth aspect, in the step of forming the resin film layer, a part of the resin film layer is fitted into a gap between the source electrode and the drain electrode.
- a method for manufacturing a flexible semiconductor device Forty-second aspect: The method for producing a flexible semiconductor device according to the forty-first or forty-first aspect, wherein the step of forming the resin film layer is performed by a roll-to-roll method.
- the gate insulating film is formed by a sol-gel method.
- Forty-fourth aspect The method for manufacturing a flexible semiconductor device according to any one of the thirty-sixth to forty-third aspects, wherein heat treatment is performed on the gate insulating film after the step (B) ′.
- the method includes a step of forming a support substrate on the insulating layer, and subjecting the semiconductor layer to a heat treatment
- a method for manufacturing a flexible semiconductor device characterized in that: A forty-sixth aspect: a method of manufacturing a flexible semiconductor device, Step of preparing metal foil (A) ", Step (B) "of forming an insulating layer including a portion to be a gate insulating film on the metal foil Step (C) "of forming a photocurable conductive paste layer by providing a photocurable conductive paste on the main surface of the insulating layer opposite to the side on which the gate electrode is formed, Etching a part of the metal foil to form a gate electrode from the metal foil (D) " And using the gate electrode as a mask, irradiating light from the side where the gate electrode is formed, thereby curing a part of the photocurable conductive paste layer to
- the source electrode and the drain electrode are used as bank members, and a semiconductor material is provided in a gap between the source electrode and the drain electrode.
- a method for manufacturing a flexible semiconductor device which is characterized by the following.
- a fifty-first aspect a method of manufacturing an image display device comprising the flexible semiconductor device according to any one of the first to eighth or 22-31 aspects, (I) providing the flexible semiconductor device provided with a pixel electrode; and (II) forming an image display unit composed of a plurality of pixels on the flexible semiconductor device. Manufacturing method.
- 52nd aspect In the 51st aspect, in the step (II), a plurality of pixel restricting portions are formed, and the pixels are formed on the pixel electrodes in a region partitioned by the plurality of pixel restricting portions.
- a method for manufacturing an image display device Fifty-third aspect: In the fifty-first aspect, in the step (II), a light emitting layer is formed on the pixel electrode so as to cover the pixel electrode, and a color filter is formed on the light emitting layer. A method for manufacturing an image display device.
- an Ag paste is used as the photocurable conductive paste, but the present invention is not necessarily limited to such mode.
- Cu particles can be used instead of Ag particles, an unsaturated polyester resin can be used as a photocurable resin, or butyl carbitol acetate (BCA) can also be used as a photocurable conductive paste.
- BCA butyl carbitol acetate
- the present invention in the above mask mode, as a specific example of the light to be irradiated, a mode in which light having a wavelength of about 436 nm (so-called g-line) is used (the resin film layer is made of acrylic resin (PMMA) or polycarbonate ( PC), the gate insulating film is made of silicon oxide, and the semiconductor layer is made of InGaZnO), the present invention is not necessarily limited to such an embodiment.
- the wavelength of irradiation light can select the wavelength which can harden a photocurable paste, and the wavelength which permeate
- transmission does not mean 100% transmission, but transmission to the extent that irradiation light sufficient to cure the photocurable paste reaches.
- light having a wavelength of about 365 nm may be used.
- each component of the flexible semiconductor device of the present invention is configured such that the flexible semiconductor device can be suitably used as a TFT (Thin Film Transistor).
- TFT Thin Film Transistor
- a zero potential is applied to the source electrode and a necessary voltage is applied to the drain electrode.
- a semiconductor layer is formed between the source electrode and the drain electrode and is called a channel region.
- the channel region is formed on the gate structure so as to be in contact with the gate insulating film.
- the gate structure includes a gate insulating film and a gate electrode.
- the electric resistance of the channel region can be changed, and as a result, the value of the current flowing between the source electrode and the drain electrode can be changed.
- This is the basic operation of the TFT and the function of each component.
- the resin film does not directly participate in the operation of the lower TFT, it plays a role of sealing and protecting each component of the TFT such as the source electrode, and mechanically holding each component of the TFT such as the source electrode. Due to the role of the support substrate and the flexibility of the resin film itself, the entire semiconductor device of the present invention is provided with flexibility to realize a flexible semiconductor device.
- the manufacturing method of the present invention is excellent in productivity of flexible semiconductor devices.
- the obtained flexible semiconductor device can be used for various image display units, and can also be used for electronic paper, digital paper, and the like.
- it can be used in an image display unit of a digital still camera and a camcorder, an image display unit of electronic paper as shown in FIG.
- the flexible semiconductor device obtained by the manufacturing method of the present invention is applicable to various uses (for example, RF-IDs, memories, MPUs, solar cells, sensors, etc.) that are currently being studied for printing electronics. be able to.
- the present application includes Japanese Patent Application No. 2010-112317 (Application Date: May 14, 2010, Title of Invention: “Flexible Semiconductor Device and Method of Manufacturing the Same”) and Japanese Patent Application No. 2010-112319 (Application) Date: May 14, 2010, title of invention: “flexible semiconductor device and manufacturing method thereof”), claiming priority under the Paris Convention. All the contents disclosed in the application are incorporated herein by this reference.
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Abstract
Description
フレキシブル半導体装置の製造方法であって、
金属箔を用意する工程(A)、
金属箔に、ゲート絶縁膜となる部位を含む絶縁層を形成する工程(B)、
絶縁層の上に、支持基板を形成する工程(C)、
金属箔の一部をエッチングして、金属箔からソース電極およびドレイン電極を形成する工程(D)、
ソース電極およびドレイン電極をバンク部材として用いて、ソース電極およびドレイン電極の間に位置する間隙に半導体層を形成する工程(E)、
半導体層、ソース電極およびドレイン電極を覆うように、絶縁層の上に樹脂フィルム層を形成する工程(F)
を含んで成り、工程(F)では、樹脂フィルム層の一部を、ソース電極およびドレイン電極の間の間隙へと嵌合させる、フレキシブル半導体装置の製造方法が提供される。
ゲート電極、
ゲート電極上に設けられ、ゲート絶縁膜となる部位を有する絶縁層、
絶縁層の上に形成され、金属箔から構成されたソース電極およびドレイン電極
を有して成り、
ソース電極およびドレイン電極の間には間隙が存在し、それによって、かかる間隙を挟んで配置されたソース電極およびドレイン電極がバンク部材となっており、
半導体層が間隙に収まるように形成されており、
半導体層、ソース電極およびドレイン電極を覆うように樹脂フィルム層が絶縁層の上に形成され、その樹脂フィルム層には間隙に嵌合した突起部が設けられている。
フレキシブル半導体装置;および
フレキシブル半導体装置上に形成されている複数の画素より構成された画像表示部
を有して成り、
フレキシブル半導体装置のソース電極およびドレイン電極の間には間隙が存在し、それによって、間隙を挟んで配置されたソース電極およびドレイン電極がバンク部材となっており、
間隙にはフレキシブル半導体装置の半導体層が形成され、フレキシブル半導体装置の樹脂フィルム層には間隙に嵌合した突起部が設けられていることを特徴としている。
図1(a)及び(b)を参照しながら、本発明の実施形態に係るフレキシブル半導体装置100について説明する。図1(a)は、本発明のフレキシブル半導体装置100の構成を模式的に示す斜視図である。また、図1(b)は、フレキシブル半導体装置100のソース30sと、チャネル22(20)と、ドレイン30dとの関係を示す図である。
本発明におけるようなバンク部材は、光硬化による別の電極形成の“マスク”として用いることができる。具体的には、金属箔のエッチングにより得られた「間隙を有するソース・ドレイン電極」をマスクとして用いて光照射を実施し、それによって、光硬化性導電性ペースト層を部分的に硬化させてゲート電極を形成することができる。これは、従来技術におけるフレキシブル半導体装置の設計では「トランジスタの寄生容量の影響を考慮する必要があり、かかる寄生容量を一定かつ最小にすることが望まれている」といった事情があるので、その事情にとって特に有利となる。以下マスク態様の本発明について詳述する。
金属箔を用意する工程(A)’、
金属箔に、ゲート絶縁膜となる部位を含む絶縁層を形成する工程(B)’、
金属箔の一部をエッチングして、かかる金属箔からソース電極およびドレイン電極を形成する工程(C)’、
絶縁層の主面のうち半導体層が形成される側と反対側の主面に、光硬化性の導電性ペーストを供して、光硬化性導電性ペースト層を形成する工程(D)’、ならびに
ソース電極およびドレイン電極をマスクとして用いて、かかるソース電極およびドレイン電極が形成された側から光を照射し、それによって、光硬化性導電性ペースト層の一部を硬化させてゲート電極を形成する工程(E)’
を含んで成ることを特徴とする。
ゲート絶縁膜となる部位を有する絶縁層、および
絶縁層の上に形成され、金属箔から構成されたソース電極およびドレイン電極
を有して成り、
ソース電極およびドレイン電極の間の間隙には半導体層が形成されており、
絶縁層の主面のうち、ソース電極およびドレイン電極が形成された側と反対側の主面にゲート電極が形成されており、
ソース電極の一方の端面(又は端部)とゲート電極の一方の端面(又は端部)とが相互に整合して位置していると共に、ドレイン電極の一方の端面(又は端部)とゲート電極の他方の端面(又は端部)とが相互に整合して位置している。
金属箔を用意する工程(A)”、
金属箔に、ゲート絶縁膜となる部位を含む絶縁層を形成する工程(B)”、
絶縁層の主面のうちゲート電極が形成される側と反対側の主面に、光硬化性の導電性ペーストを供して、光硬化性導電性ペースト層を形成する工程(C)”、
金属箔の一部をエッチングして、該金属箔からゲート電極を形成する工程(D)”、および
ゲート電極をマスクとして用いて、ゲート電極が形成された側から光を照射し、それによって、光硬化性導電性ペースト層の一部を硬化させてソース電極およびドレイン電極を形成する工程(E)”
を含んで成る。
ゲート絶縁膜となる部位を有する絶縁層、および
絶縁層の上に形成され、金属箔から構成されたソース電極およびドレイン電極
を有して成り、
ソース電極およびドレイン電極の間の間隙には半導体層が形成されており、
絶縁層の主面のうち、ソース電極およびドレイン電極が形成された側と反対側の主面にゲート電極が形成されており、
ソース電極の一方の端面とゲート電極の一方の端面とが相互に整合して位置していると共に、ドレイン電極の一方の端面とゲート電極の他方の端面とが相互に整合して位置している(より具体的には「ソース電極・ドレイン電極がゲート電極と自己整合的に一致するように形成されている」)。
図13を参照して、本発明に係るフレキシブル半導体装置100を画像表示装置に搭載する態様について説明する(ちなみに、フレキシブル半導体装置100’を画像表示装置に搭載する態様であっても同様である)。図13に示した回路90は、画像表示装置(ここでは有機ELディスプレイ)に搭載される駆動回路であり、ここでは画像表示装置の一画素の構成を表している。この例の画像表示装置の各画素は、2つのトランジスタ(100A、100B)と、1つのコンデンサ85との組み合わせの回路から構成されている。この駆動回路には、スイッチ用トランジスタ(以下、「Sw-Tr」と称する)100Aと、駆動用トランジスタ(以下、「Dr-Tr」と称する)100Bとが含まれており、両方のトランジスタ(100A、100B)とも、本発明のフレキシブル半導体装置100から構成されている。なお、フレキシブル半導体装置100の構造体の一部に、コンデンサ85を形成することも可能である。その場合、本実施形態の絶縁層10を、コンデンサ85の誘電体層として利用してもよい。
次に、画素表示装置の製造方法について説明する。具体的には、図20を参照して本態様のOLEDの製造方法について説明する。
本発明のフレキシブル半導体装置100は、“フレキシブル”であるために、ロール・ツー・ロール方式によって作製することが可能である。図22は、本実施形態のフレキシブル半導体装置100がロール・ツー・ロール工法で作製される態様を表している。
上述したことであるが、本発明に従えば、半導体層の改質を容易かつ効果的に行うことができる。特に半導体層20を酸化物半導体から構成した場合の改質を行うことができる。例えば、ZnOなどの結晶性の酸化物半導体では、スパッタなどで成膜した直後には結晶層の中に多く非晶質層が含まれており、それによって、半導体デバイスとしての特性を示さない場合が多い。しかしながら、本発明では、図3(a)または図7(a)に示した状態、すなわち、間隙50に半導体材料(ここでは、酸化物半導体)が充填された状態は、フレキシブルな状態でありながら、ソース・ドレイン電極30(30s・30d)と絶縁層10と半導体層20とから構成された構造であるので(すなわち、残りは、支持基板72であるので)、アニール工程や、レーザ照射工程を大きな制約なく実行することができる。そのような工程を実行することで、ZnOなどの酸化物半導体の結晶性を向上させて、その結果、半導体特性を改善することができる。
なお、総括的に述べると、上述した本発明は、以下の態様を包含している:
第1の態様:フレキシブル半導体装置であって、
ゲート電極、
前記ゲート電極上に設けられ、ゲート絶縁膜となる部位を有する絶縁層、および
前記絶縁層の上に形成され、金属箔から構成されたソース電極およびドレイン電極
を有して成り、
前記ソース電極および前記ドレイン電極の間には間隙が存在し、それによって、該間隙を挟んで配置された前記ソース電極および前記ドレイン電極がバンク部材となっており、
前記間隙に半導体層が形成されており、
前記絶縁層の上には、前記半導体層、前記ソース電極および前記ドレイン電極を覆うように樹脂フィルム層が形成され、該樹脂フィルム層には前記間隙に嵌合した突起部が設けられているフレキシブル半導体装置。
第2の態様:前記第1の態様において、前記ソース電極および前記ドレイン電極が成す面のうち、前記間隙を挟んで対向する端面が傾斜面を成していることを特徴とするフレキシブル半導体装置。
第3の態様:前記第1または第2の態様において、前記樹脂フィルム層の前記突起部と、前記ソース電極および前記ドレイン電極の間の前記間隙とが、相補的な形状を有していることを特徴とするフレキシブル半導体装置。
第4の態様:前記第1~3の態様のいずれかにおいて、前記半導体層が、シリコンを含んで成ることを特徴とするフレキシブル半導体装置。
第5の態様:前記第1~3の態様のいずれかにおいて、前記半導体層が酸化物半導体を含んで成ることを特徴とするフレキシブル半導体装置。
第6の態様:前記第5の態様において、前記酸化物半導体がZnOまたはInGaZnOであることを特徴とするフレキシブル半導体装置。
第7の態様:前記第1~6の態様のいずれかにおいて、前記ゲート絶縁膜が無機材料から形成されていることを特徴とするフレキシブル半導体装置。
第8の態様:前記第1~6の態様のいずれかにおいて、前記金属箔が弁金属を含んで成り、前記ゲート絶縁膜が前記弁金属の陽極酸化膜であることを特徴とするフレキシブル半導体装置。
第9の態様:前記第1~8の態様のいずれかのフレキシブル半導体装置を用いた画像表示装置であって、
前記フレキシブル半導体装置;および
前記フレキシブル半導体装置上に形成されている複数の画素より構成された画像表示部
を有して成り、
前記フレキシブル半導体装置のソース電極およびドレイン電極の間には間隙が存在し、それによって、該間隙を挟んで配置された前記ソース電極および前記ドレイン電極がバンク部材となっており、
前記間隙には前記フレキシブル半導体装置の半導体層が形成されており、前記フレキシブル半導体装置の樹脂フィルム層には前記間隙に嵌合した突起部が設けられていることを特徴とする、画像表示装置。
第10の態様:前記第9の態様において、
前記画像表示部が、
前記フレキシブル半導体装置上に形成されている画素電極;
前記画素電極上に形成されている発光層;および
前記発光層上に形成されている透明電極層
を有して成ることを特徴とする画像表示装置。
第11の態様:前記第10の態様において、前記発光層が、画素規制部によって仕切られた領域に形成されていることを特徴とする画像表示装置。
第12の態様:前記第10の態様において、前記透明電極層上にカラーフィルターを有して成ることを特徴とする画像表示装置。
第13の態様:フレキシブル半導体装置の製造方法であって、
金属箔を用意する工程(A)、
前記金属箔に、ゲート絶縁膜となる部位を含む絶縁層を形成する工程(B)、
前記絶縁層の上に、支持基板を形成する工程(C)、
前記金属箔の一部をエッチングして、該金属箔からソース電極およびドレイン電極を形成する工程(D)、
前記ソース電極および前記ドレイン電極をバンク部材として用いて、該ソース電極および該ドレイン電極の間に位置する間隙に半導体層を形成する工程(E)、および
前記半導体層、前記ソース電極および前記ドレイン電極を覆うように、前記絶縁層の上に樹脂フィルム層を形成する工程(F)
を含んで成り、
前記工程(F)では、前記樹脂フィルム層の一部を、前記ソース電極および前記ドレイン電極の間の前記間隙へと嵌合させる、フレキシブル半導体装置の製造方法。
第14の態様:前記第13の態様において、前記工程(D)では、金属箔に対してフォトリソとウェットエッチングとを実施して、前記ソース電極および前記ドレイン電極が成す面のうち前記間隙を挟んで対向する端面を傾斜面とすることを特徴とするフレキシブル半導体装置の製造方法。
第15の態様:前記第13または14の態様において、前記工程(F)をロール・ツー・ロール工法により行うことを特徴とするフレキシブル半導体装置の製造方法。
第16の態様:前記第13~15の態様のいずれかにおいて、前記支持基板を除去した後、前記絶縁層のうち前記ゲート絶縁膜となる部位の表面にゲート電極を形成することを特徴とするフレキシブル半導体装置の製造方法。
第17の態様:前記第13~16の態様のいずれかにおいて、前記支持基板としてセラミック基材または金属基材を用いることを特徴とするフレキシブル半導体装置の製造方法。
第18の態様:前記第13~17の態様のいずれかにおいて、前記工程(B)ではゾルゲル法によって前記ゲート絶縁膜を形成することを特徴とするフレキシブル半導体装置の製造方法。
第19の態様:前記第17の態様において、前記工程(B)の後、前記ゲート絶縁膜に加熱処理を施すことを特徴とするフレキシブル半導体装置の製造方法。
第20の態様:前記第17または19の態様において、前記工程(E)の後、前記半導体層に加熱処理を施すことを特徴とするフレキシブル半導体装置の製造方法。
第21の態様:前記第13~15の態様のいずれかにおいて、前記支持基板として金属基材を用い、前記工程(F)の後、前記金属基材をパターニングすることによってゲート電極を形成することを特徴とするフレキシブル半導体装置の製造方法。
第22の態様:フレキシブル半導体装置であって、
ゲート絶縁膜となる部位を有する絶縁層、および
前記絶縁層の上に形成され、金属箔から構成されたソース電極およびドレイン電極
を有して成り、
前記ソース電極および前記ドレイン電極の間の間隙には半導体層が形成されており、
前記絶縁層の主面のうち、前記ソース電極および前記ドレイン電極が形成された側と反対側の主面にゲート電極が形成されており、
前記ソース電極の一方の端面と前記ゲート電極の一方の端面とが相互に整合して位置していると共に、前記ドレイン電極の一方の端面と前記ゲート電極の他方の端面とが相互に整合して位置している、フレキシブル半導体装置。
第23の態様:前記第22の態様において、前記ソース電極および前記ドレイン電極の双方の前記端面に対して前記ゲート電極の前記端面が自己整合的に一致するように形成されていることを特徴とするフレキシブル半導体装置。
第24の態様:前記第22の態様において、前記ソース電極の前記一方の端面と前記絶縁層との接点Aと、前記ゲート電極の前記一方の端面と前記絶縁層との接点Bとが相互に対向していると共に、
前記ドレイン電極の前記一方の端面と前記絶縁層との接点Cと、前記ゲート電極の前記他方の端面と前記絶縁層との接点Dとが相互に対向していることを特徴とするフレキシブル半導体装置。
第25の態様:前記第22~24の態様のいずれかにおいて、前記ソース電極および前記ドレイン電極が成す面のうち、前記間隙を挟んで対向する端面が傾斜面を成していることを特徴とするフレキシブル半導体装置。
第26の態様:前記第22~25の態様のいずれかにおいて、前記絶縁層の上には、前記半導体層、前記ソース電極および前記ドレイン電極を覆うように樹脂フィルム層が形成されており
前記樹脂フィルム層の突起部と、前記ソース電極および前記ドレイン電極の間の前記間隙とが、相補的な形状を有していることを特徴とする、フレキシブル半導体装置。
第27の態様:前記第22~26の態様のいずれかにおいて、前記半導体層がシリコンを含んで成ることを特徴とするフレキシブル半導体装置。
第28の態様:前記第22~26の態様のいずれかにおいて、前記半導体層が酸化物半導体を含んで成ることを特徴とするフレキシブル半導体装置。
第29の態様:前記第28の態様において、前記酸化物半導体がZnOまたはInGaZnOであることを特徴とするフレキシブル半導体装置。
第30の態様:前記第22~29の態様のいずれかにおいて、前記ゲート絶縁膜が無機材料から形成されていることを特徴とするフレキシブル半導体装置。
第31の態様:前記第22~29の態様のいずれかにおいて、前記金属箔が弁金属を含んで成り、前記ゲート絶縁膜が前記弁金属の陽極酸化膜であることを特徴とする、フレキシブル半導体装置。
第32の態様:前記第22~31の態様のいずれかのフレキシブル半導体装置を用いた画像表示装置であって、
前記フレキシブル半導体装置;および
前記フレキシブル半導体装置上に形成されている複数の画素より構成された画像表示部
を有して成り、
前記フレキシブル半導体装置では、ソース電極の一方の端面とゲート電極の一方の端面とが相互に整合して位置していると共に、前記ドレイン電極の一方の端面と前記ゲート電極の他方の端面とが相互に整合して位置していることを特徴とする、画像表示装置。
第33の態様:前記第32の態様において、
前記画像表示部が、
前記フレキシブル半導体装置上に形成されている画素電極;
前記画素電極上に形成されている発光層;および
前記発光層上に形成されている透明電極層
を有して成ることを特徴とする画像表示装置。
第34の態様:前記第33の態様において、前記発光層が、画素規制部によって仕切られた領域に形成されていることを特徴とする画像表示装置。
第35の態様:前記第33の態様において、前記透明電極層上にカラーフィルターを有して成ることを特徴とする画像表示装置。
第36の態様:フレキシブル半導体装置の製造方法であって、
金属箔を用意する工程(A)’、
前記金属箔に、ゲート絶縁膜となる部位を含む絶縁層を形成する工程(B)’、
前記金属箔の一部をエッチングして、該金属箔からソース電極およびドレイン電極を形成する工程(C)’、
前記絶縁層の主面のうち半導体層が形成される側と反対側の主面に、光硬化性の導電性ペーストを供して、光硬化性導電性ペースト層を形成する工程(D)’、ならびに
前記ソース電極および前記ドレイン電極をマスクとして用いて、前記ソース電極および前記ドレイン電極が形成された側から光を照射し、それによって、前記光硬化性導電性ペースト層の一部を硬化させてゲート電極を形成する工程(E)’
を含んで成る、フレキシブル半導体装置の製造方法。
第37の態様:前記第36の態様において、前記工程(C)’の後では、前記ソース電極と前記ドレイン電極との間の間隙に収まるように前記絶縁層の主面上に半導体層を形成し、
前記工程(E)’においては、前記照射された光が前記半導体層を透過することによって、前記光硬化性導電性ペースト層の一部が硬化することを特徴とする、フレキシブル半導体装置の製造方法。
第38の態様:前記第37の態様において、前記半導体層の形成においては、前記ソース電極および前記ドレイン電極をバンク部材として用いて、該ソース電極および該ドレイン電極の間の間隙に半導体材料を供することを特徴とする、フレキシブル半導体装置の製造方法。
第39の態様:前記第36~38の態様のいずれかにおいて、前記工程(C)’では、金属箔に対してフォトリソとウェットエッチングとを実施して、前記ソース電極および前記ドレイン電極が成す面のうち、相互に対向する端面を傾斜面とすることを特徴とする、フレキシブル半導体装置の製造方法。
第40の態様:前記第37の態様に従属する前記第38または39の態様において、前記半導体層、前記ソース電極および前記ドレイン電極を覆うように、前記絶縁層の上に樹脂フィルム層を形成する工程を更に含んで成ることを特徴とする、フレキシブル半導体装置の製造方法。
第41の態様:前記第40の態様において、前記樹脂フィルム層を形成する工程では、前記樹脂フィルム層の一部を、前記ソース電極および前記ドレイン電極の間の間隙へと嵌合させることを特徴とする、フレキシブル半導体装置の製造方法。
第42の態様:前記第40または41の態様において、前記樹脂フィルム層を形成する工程をロール・ツー・ロール工法により行うことを特徴とする、フレキシブル半導体装置の製造方法。
第43の態様:前記第36~42の態様のいずれかにおいて、前記工程(B)’では、ゾルゲル法によって前記ゲート絶縁膜を形成することを特徴とする、フレキシブル半導体装置の製造方法。
第44の態様:前記第36~43の態様のいずれかにおいて、前記工程(B)’の後、前記ゲート絶縁膜に加熱処理を施すことを特徴とする、フレキシブル半導体装置の製造方法。
第45の態様:前記第37の態様に従属する前記第38~44の態様のいずれかにおいて、前記絶縁層の上に支持基板を形成する工程を含んでなり、前記半導体層に加熱処理を施すことを特徴とする、フレキシブル半導体装置の製造方法。
第46の態様:フレキシブル半導体装置の製造方法であって、
金属箔を用意する工程(A)”、
前記金属箔に、ゲート絶縁膜となる部位を含む絶縁層を形成する工程(B)”、
前記絶縁層の主面のうちゲート電極が形成される側と反対側の主面に、光硬化性の導電性ペーストを供して、光硬化性導電性ペースト層を形成する工程(C)”、
前記金属箔の一部をエッチングして、該金属箔からゲート電極を形成する工程(D)”
および
前記ゲート電極をマスクとして用いて、前記ゲート電極が形成された側から光を照射し、それによって、前記光硬化性導電性ペースト層の一部を硬化させてソース電極およびドレイン電極を形成する工程(E)”
を含んで成る、フレキシブル半導体装置の製造方法。
第47の態様:前記第46の態様において、前記工程(E)”の後では、前記ソース電極と前記ドレイン電極との間の間隙に収まるように前記絶縁膜の主面上に半導体層を形成し、
前記半導体層の形成においては、前記ソース電極および前記ドレイン電極をバンク部材として用い、前記ソース電極および前記ドレイン電極の間の間隙に半導体材料を供することを特徴とする、フレキシブル半導体装置の製造方法。
第48の態様:前記第47の態様において、前記半導体層、前記ソース電極および前記ドレイン電極を覆うように、前記絶縁層の上に樹脂フィルム層を形成する工程を更に含んで成ることを特徴とする、フレキシブル半導体装置の製造方法。
第49の態様:前記第48の態様において、前記樹脂フィルム層を形成する工程では、前記樹脂フィルム層の一部を、前記ソース電極および前記ドレイン電極の間の前記間隙へと嵌合させることを特徴とする、フレキシブル半導体装置の製造方法。
第50の態様:前記第48または49の態様において、前記樹脂フィルム層を形成する工程をロール・ツー・ロール工法により行うことを特徴とする、フレキシブル半導体装置の製造方法。
第51の態様:前記第1~8または22~31の態様のいずれか1つのフレキシブル半導体装置を備えた画像表示装置の製造方法であって、
(I)画素電極を備えた前記フレキシブル半導体装置を供する工程;および
(II)前記フレキシブル半導体装置上に、複数の画素より構成されている画像表示部を形成する工程
を含んで成る、画像表示装置の製造方法。
第52の態様:前記第51の態様において、前記工程(II)では、複数の画素規制部を形成し、該複数の画素規制部によって仕切られた領域の前記画素電極上に前記画素を形成することを特徴とする画像表示装置の製造方法。
第53の態様:前記第51の態様において、前記工程(II)において、前記画素電極を覆うように前記画素電極上に発光層を形成し、該発光層上にカラーフィルターを形成することを特徴とする画像表示装置の製造方法。
以上、本発明の好適な実施形態を中心に説明してきたが、本発明はこれに限定されず、種々の改変がなされ得ることを当業者は容易に理解されよう。
10g ゲート絶縁膜
11 導電性ペースト
12 ゲート電極
13 ゲート電極の端面
20 半導体層
22 チャネル領域
30s ソース電極
30d ドレイン電極
31s ソース電極の端面
31d ドレイン電極の端面
50 間隙(間隙部)
60 樹脂フィルム
62 照射光
63 照射光
65 突起部(嵌合部)
70 金属箔
72 支持基板
73 支持基板
74 樹脂フィルム
80 表示部
82 ビア
84 配線
85 コンデンサ
90 駆動回路
92 データライン
94 選択ライン
100 フレキシブル半導体装置
110 フィルム積層体(積層構造体)
150 画素電極
160 画素規制部
160’画素規制部の前駆体層
165 画素規制部の形成に用いるフォトマスク
170 発光層
180 透明電極層
190 カラーフィルター
200 積層構造体
210 ローラ
212 補助ローラ
215 矢印
220 ローラ
230 ローラ
300 画像表示装置
300’ 画像表示装置
Claims (18)
- フレキシブル半導体装置であって、
ゲート電極、
前記ゲート電極上に設けられ、ゲート絶縁膜となる部位を有する絶縁層、および
前記絶縁層の上に形成され、金属箔から構成されたソース電極およびドレイン電極
を有して成り、
前記ソース電極および前記ドレイン電極の間には間隙が存在し、それによって、該間隙を挟んで配置された前記ソース電極および前記ドレイン電極がバンク部材となっており、
前記間隙に半導体層が形成されており、
前記絶縁層の上には、前記半導体層、前記ソース電極および前記ドレイン電極を覆うように樹脂フィルム層が形成され、該樹脂フィルム層には前記間隙に嵌合した突起部が設けられている、フレキシブル半導体装置。 - 前記ソース電極および前記ドレイン電極が成す面のうち、前記間隙を挟んで対向する端面が傾斜面を成していることを特徴とする、請求項1に記載のフレキシブル半導体装置。
- 前記樹脂フィルム層の前記突起部と、前記ソース電極および前記ドレイン電極の間の前記間隙とが、相補的な形状を有していることを特徴とする、請求項1に記載のフレキシブル半導体装置。
- 前記半導体層が、シリコンを含んで成ることを特徴とする、請求項1に記載のフレキシブル半導体装置。
- 前記半導体層が、酸化物半導体を含んで成ることを特徴とする、請求項1に記載のフレキシブル半導体装置。
- 前記酸化物半導体がZnOまたはInGaZnOであることを特徴とする、請求項5に記載のフレキシブル半導体装置。
- 前記ゲート絶縁膜が無機材料から形成されていることを特徴とする、請求項1に記載のフレキシブル半導体装置。
- 前記金属箔が弁金属を含んで成り、
前記ゲート絶縁膜が、前記弁金属の陽極酸化膜であることを特徴とする、請求項1に記載のフレキシブル半導体装置。 - 請求項1に記載のフレキシブル半導体装置を用いた画像表示装置であって、
前記フレキシブル半導体装置;および
前記フレキシブル半導体装置上に形成されている複数の画素より構成された画像表示部
を有して成り、
前記フレキシブル半導体装置のソース電極およびドレイン電極の間には間隙が存在し、それによって、該間隙を挟んで配置された前記ソース電極および前記ドレイン電極がバンク部材となっており、
前記間隙には前記フレキシブル半導体装置の半導体層が形成され、前記フレキシブル半導体装置の樹脂フィルム層には前記間隙に嵌合した突起部が設けられていることを特徴とする、画像表示装置。 - フレキシブル半導体装置の製造方法であって、
金属箔を用意する工程(A)、
前記金属箔に、ゲート絶縁膜となる部位を含む絶縁層を形成する工程(B)、
前記絶縁層の上に、支持基板を形成する工程(C)、
前記金属箔の一部をエッチングして、該金属箔からソース電極およびドレイン電極を形成する工程(D)、
前記ソース電極および前記ドレイン電極をバンク部材として用いて、該ソース電極および該ドレイン電極の間に位置する間隙に半導体層を形成する工程(E)、および
前記半導体層、前記ソース電極および前記ドレイン電極を覆うように、前記絶縁層の上に樹脂フィルム層を形成する工程(F)
を含んで成り、
前記工程(F)では、前記樹脂フィルム層の一部を、前記ソース電極および前記ドレイン電極の間の前記間隙へと嵌合させる、フレキシブル半導体装置の製造方法。 - 前記工程(D)では、金属箔に対してフォトリソとウェットエッチングとを実施して、前記ソース電極および前記ドレイン電極が成す面のうち前記間隙を挟んで対向する端面を傾斜面とすることを特徴とする、請求項10に記載のフレキシブル半導体装置の製造方法。
- 前記工程(F)をロール・ツー・ロール工法により行うことを特徴とする、請求項10に記載のフレキシブル半導体装置の製造方法。
- 前記支持基板を除去した後、前記絶縁層のうち前記ゲート絶縁膜となる部位の表面に、ゲート電極を形成することを特徴とする、請求項10に記載のフレキシブル半導体装置の製造方法。
- 前記支持基板として、セラミック基材または金属基材を用いることを特徴とする、請求項10に記載のフレキシブル半導体装置の製造方法。
- 前記工程(B)では、ゾルゲル法によって前記ゲート絶縁膜を形成することを特徴とする、請求項10に記載のフレキシブル半導体装置の製造方法。
- 前記工程(B)の後、前記ゲート絶縁膜に加熱処理を施すことを特徴とする、請求項14に記載のフレキシブル半導体装置の製造方法。
- 前記工程(E)の後、前記半導体層に加熱処理を施すことを特徴とする、請求項14に記載のフレキシブル半導体装置の製造方法。
- 前記支持基板として金属基材を用い、
前記工程(F)の後、前記金属基材をパターニングすることによって、ゲート電極を形成することを特徴とする、請求項10に記載のフレキシブル半導体装置の製造方法。
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JP2018078298A (ja) * | 2012-01-18 | 2018-05-17 | 株式会社半導体エネルギー研究所 | 半導体装置 |
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JP2019197218A (ja) * | 2013-11-20 | 2019-11-14 | 株式会社Joled | 表示装置 |
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JPWO2017051730A1 (ja) * | 2015-09-24 | 2018-07-26 | 富士フイルム株式会社 | 有機薄膜トランジスタおよび有機薄膜トランジスタの製造方法 |
JP2022105315A (ja) * | 2020-12-31 | 2022-07-13 | エルジー ディスプレイ カンパニー リミテッド | 重畳した画素駆動部を含む表示装置 |
JP7250896B2 (ja) | 2020-12-31 | 2023-04-03 | エルジー ディスプレイ カンパニー リミテッド | 重畳した画素駆動部を含む表示装置 |
JP7454723B2 (ja) | 2020-12-31 | 2024-03-22 | エルジー ディスプレイ カンパニー リミテッド | 重畳した画素駆動部を含む表示装置 |
Also Published As
Publication number | Publication date |
---|---|
CN102598231A (zh) | 2012-07-18 |
JPWO2011142089A1 (ja) | 2013-07-22 |
EP2571043A1 (en) | 2013-03-20 |
US20120280229A1 (en) | 2012-11-08 |
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