WO2004110105A1 - 有機半導体素子及びその製造方法 - Google Patents
有機半導体素子及びその製造方法 Download PDFInfo
- Publication number
- WO2004110105A1 WO2004110105A1 PCT/JP2004/007991 JP2004007991W WO2004110105A1 WO 2004110105 A1 WO2004110105 A1 WO 2004110105A1 JP 2004007991 W JP2004007991 W JP 2004007991W WO 2004110105 A1 WO2004110105 A1 WO 2004110105A1
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- Prior art keywords
- organic semiconductor
- layer
- forming
- forming step
- electrode
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Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/20—Changing the shape of the active layer in the devices, e.g. patterning
- H10K71/231—Changing the shape of the active layer in the devices, e.g. patterning by etching of existing layers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having potential barriers
- H10K10/20—Organic diodes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having potential barriers
- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/464—Lateral top-gate IGFETs comprising only a single gate
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
Definitions
- the present invention relates to an organic semiconductor device containing an organic compound having semiconductor properties and a method for producing the same.
- a photoetching method As a method of forming a pattern of a thin film made of an inorganic material or an organic material, a photoetching method, an evaporation method using a mask, and the like are known.
- a photoresist is formed on the thin film in a predetermined pattern, a portion of the thin film that is not covered with the resist is removed by wet etching or dry etching, and the resist is peeled off. This is a method of forming a thin-film pattern.
- the vapor deposition method using a mask is a method in which a mask having a pattern of a predetermined opening is closely attached to a substrate, a thin film material is deposited through the opening, and the mask is removed to form a thin film pattern on the substrate.
- semiconductor devices such as LSIs and display devices such as LCDs and organic electroluminescence (hereinafter referred to as organic EL) are formed and fabricated. Disclosure of the invention
- the organic semiconductor device of the present invention includes a first structure portion including a first electrode, an organic semiconductor layer including an organic compound having semiconductor characteristics, and a first structure portion facing the first structure portion via the organic semiconductor layer.
- a second structure portion including two electrodes wherein the second structure portion includes a mask portion made of a material having etching resistance, and the organic semiconductor layer uses the mask portion as a mask. It is characterized by being etched and patterned to form a pattern.
- the method for manufacturing an organic semiconductor element according to the present invention includes a first structure portion including a first electrode, an organic semiconductor layer including an organic compound having semiconductor characteristics, and a first structure portion facing the first structure portion via the organic semiconductor layer.
- a second structure portion including a second electrode, wherein the first structure portion forming step of forming the first structure portion, wherein the organic semiconductor is formed on the first structure portion.
- FIG. 1 is a sectional view showing an organic semiconductor device according to the present invention.
- FIG. 2 is a sectional view showing a modification of the organic semiconductor device according to the present invention.
- FIG. 3 is a sectional view showing a modification of the organic semiconductor device according to the present invention.
- FIG. 4 is a cross-sectional view sequentially showing the processing steps of the method for manufacturing an organic semiconductor device according to the present invention.
- FIG. 5 is a cross-sectional view showing side etching that occurs when isotropic etching is performed.
- FIG. 6 is a cross-sectional view showing a modification of the method for manufacturing an organic semiconductor device according to the present invention.
- FIG. 7 is a cross-sectional view illustrating a method for manufacturing an organic EL display panel according to the present invention.
- FIG. 8 is a cross-sectional view illustrating a method of manufacturing a full-color display panel according to the present invention.
- FIG. 9 is a cross-sectional view showing a modification of the method of manufacturing a full-color display panel according to the present invention.
- FIG. 10 is a cross-sectional view showing a modification of the method for manufacturing an organic EL display panel according to the present invention.
- FIG. 11 is a cross-sectional view showing a modification of the method for manufacturing an organic EL display panel according to the present invention.
- FIG. 12 is a cross-sectional view showing a modification of the method for manufacturing an organic EL display panel according to the present invention.
- FIG. 13 is a cross-sectional view illustrating a method for manufacturing an organic TFT according to the present invention.
- an organic semiconductor device 1 has a substrate 2 made of a substrate material such as a resin.
- Substrate 2 is good as long as it has insulating properties at least on its surface
- the insulating material may be made of glass or silicon wafers whose surface is oxidized.
- the substrate 2 may have flexibility. Further, the substrate 2 may be transparent.
- a first structural part 3 including a first electrode is provided on the substrate 2.
- the first electrode is made of a low-resistance material such as a metal.
- the first structural section 3 may be made of a transparent material. Also, it is possible to include a protective layer made of a moisture-proof material.
- the organic semiconductor layer 4 may include a light emitting layer having electroluminescence characteristics. Further, a functional layer for improving the luminous efficiency of the light emitting layer may be included.
- the functional layer includes an organic compound layer made of a low molecular weight organic compound or a high molecular weight organic compound, and may be formed by combining a layer made of a low molecular weight compound and a layer made of a high molecular weight compound.
- a second structural part 5 including a second electrode is provided on the organic semiconductor layer 4, a second structural part 5 including a second electrode is provided.
- the second electrode is made of a low-resistance material such as a metal.
- the second structure section 5 may be transparent.
- the second structure section 5 may include an insulating layer having insulating properties.
- the second structure portion 5 includes a mask portion made of a material that is more excellent in etching resistance such as corrosion resistance than the organic semiconductor layer 3.
- the mask portion may be made of an inorganic compound such as a metal and a metal oxide. Even if the second electrode is a mask part, it is OK.
- the organic semiconductor element 1 having a strong structure has an organic semiconductor layer pattern formed by performing an etching process using the mask portion as a mask. In the organic semiconductor element having such a configuration, there is no displacement between the organic semiconductor layer and the mask portion.
- the organic semiconductor element as described above is an organic EL element.
- the second structural unit 5 may include a protective unit having a function of preventing deterioration of the organic semiconductor element.
- the protection section may be made of a material having moisture resistance such as resin, metal oxide, metal nitride and the like. Further, the protection section may be formed by laminating a plurality of layers made of the above materials.
- the protective portion may be a mask portion as described above.
- the second structural part is composed of the second electrode 6 and the protective layer 7. Since the etching process is performed using the protective layer 7 as a mask, the pattern of the organic semiconductor layer 4 can be formed according to the pattern of the protective layer 7. According to a powerful configuration, the shape of the organic semiconductor element can be changed by changing the pattern of the protection unit.
- the first structure may include a plurality of electrodes.
- the first structure portion includes a first electrode 8 and a third electrode 9, and the first electrode 8 and the third electrode 9 may be a source electrode and a drain electrode.
- the second structure may include a gate insulating layer 10 provided on the organic semiconductor layer 4 and a gate electrode 11 provided on the gate insulating layer 10.
- the organic semiconductor element having such a configuration becomes an organic thin film transistor (hereinafter, referred to as an organic TFT).
- the method for manufacturing an organic semiconductor device includes a first structure portion forming step of forming a first structure portion 3 including an electrode on a substrate 2 (FIG. 4A).
- the first structural part forming step is a step of forming the first structural part by a film forming means using a sputtering method, a CVD method, a printing method, or the like.
- the film forming means may include a pattern forming means for forming a thin film pattern by using a thin film pattern forming method such as a photoetching method.
- the organic semiconductor layer forming step is a step of forming the organic semiconductor layer 4 using various film forming methods such as a spin coating method, a blade coating method, a vapor deposition method, a printing method, and an ink jet method.
- a spin coating method a blade coating method
- a vapor deposition method a vapor deposition method
- a printing method a printing method
- an ink jet method a material such as a polymer compound to which the evaporation method is difficult to apply
- the spin coating method and the blade coating method can be used to form the organic semiconductor layer 4 having a uniform thickness.
- the organic semiconductor layer 4 can be formed by a combination of the above-described film forming methods.
- a second structure forming step (FIG. 4C) for forming a second structure 5 including an electrode on the organic semiconductor layer 4 is performed.
- the second structure forming step preferably does not include a step of heating the organic semiconductor layer to a high temperature.
- a vapor deposition method may be used, and a film may be formed by a film forming means.
- the second structure part forming step includes a mask part forming step of forming a mask part made of a material having etching resistance.
- the mask portion forming step may be, for example, a second electrode forming step of forming a second electrode.
- an etching step (FIG. 4D) of removing the organic semiconductor layer 4 not covered by the mask part by etching is performed.
- an etching means using a dry etching method or a wet etching method can be used.
- Dry etching is a method of chemically or physically etching an object with an active gas (etching gas).
- the etching gas include ozone (o 3 ), oxygen (O 2 ), argon (Ar), carbon tetrafluoride (CF 4 ), and a mixed gas thereof.
- the etching process by dry etching is a process in which an organic compound is decomposed by ozone generated by, for example, irradiating an oxygen-containing gas with ultraviolet light (UV).
- the dry etching step may be a step of exposing a plasma gas to an organic compound to decompose the organic compound. Les ,.
- the etching process is also a good reactive ion etching (RIE) process in which etching is performed by accelerating and colliding the ionized etching gas.
- RIE reactive ion etching
- Wet etching is a method of chemically or physically removing an object with an etchant capable of dissolving a thin film made of an organic compound.
- the etchant is, for example, an organic solvent that can dissolve the organic semiconductor layer.
- the etching solution may contain a component that decomposes the organic compound in the organic semiconductor layer.
- the etching step is preferably performed in an environment where there is no moisture around the substrate to be etched, for example, in an environment filled with an inert gas or in a vacuum. Do inside. By performing etching in a strong state, it is possible to prevent the organic semiconductor from being deteriorated by moisture.
- the maximum temperature of the etching step is preferably set to a temperature lower than the glass transition temperature (Tg), melting point, and sublimation temperature of the organic layer.
- the mask In the etching step, if the mask is exposed to an etching gas and an etching solution, the mask may be deteriorated.
- the mask portion is made of a material such as metal which is easily oxidized
- the metal is oxidized.
- the etching rate ratio should be 15 or less. Preferable 1: 1 or less is more preferred 1Z100 or less is most preferred.
- the thickness of the mask portion is determined in consideration of the thickness removed by etching with reference to the etching rate ratio.
- the etching step may be a step of etching at least one organic compound layer.
- a functional layer such as a protective layer which also has a moisture-proof material strength.
- the organic semiconductor device 1 is obtained through the above steps (FIG. 4 (e)).
- the mask portion functions as a mask when performing the etching and constitutes the organic semiconductor element, a separate step of manufacturing a mask is unnecessary.
- the number of steps can be reduced because the mask removing step performed in the conventional technique is unnecessary.
- a pattern can be formed without exposure to a solvent or water, a pattern of an organic semiconductor layer made of a material having no water resistance can be formed.
- the organic semiconductor layer 4 supporting the mask portion 13 has an end portion force of the mask portion 13. Accordingly, the width is smaller than the width of the mask portion 13.
- a short circuit prevention layer for preventing such a short circuit may be provided between the second electrode and the first electrode.
- the short-circuit prevention layer forming step of forming the short-circuit prevention layer is performed in the first structural portion. It is performed between the forming step and the second structure part forming step.
- a short circuit preventing layer forming step for forming the short circuit preventing layer 14 made of an insulating material is performed.
- the short-circuit preventing layer forming step is also a step of forming a short-circuit preventing layer 14 on the first electrode 12 by pattern forming means using a photo-etching method after forming a film by a film forming method such as a sputtering method. good.
- the short-circuit prevention layer forming step may be a step of forming a short-circuit prevention layer 14 by irradiating a predetermined pattern with light after disposing the photosensitive material.
- an inorganic compound having etching resistance such as a metal oxide or a metal nitride
- an organic compound such as polyimide or photoresist may be used as the insulating layer material.
- the organic functional layer forming step (FIG. 6 (c)) and the second electrode forming step (FIG. 6 (d)) are sequentially performed, and etching is performed using the second electrode as a mask (FIG. e))) is performed to obtain the organic semiconductor element 1B.
- an anode forming step for forming an anode 15 on a transparent glass substrate 2 is performed.
- the anode forming step includes forming a 1500-A thick indium tin oxide (hereinafter referred to as ITO) layer using a sputtering method, and forming a strong ITO layer in a predetermined pattern.
- Pattern forming step for example, a photoresist AZ6112 manufactured by Tokyo Ohka Kogyo Co., Ltd. is formed in a predetermined pattern on the ITO layer, immersed in a mixed solution of ferric chloride aqueous solution and hydrochloric acid, and covered with the resist. This is the step to remove the ITO from the part.
- the anode can be made of indium monozinc oxide (hereinafter referred to as IZO), Au, Pd, or other material that has a large work function.
- the extraction electrode forming step includes a film forming step of forming a chromium (Cr) layer having a thickness of 1500 A using a sputtering method, and a pattern forming step of forming the Cr layer into a predetermined pattern.
- a photoresist AZ6112 manufactured by Tokyo Ohka Kogyo Co., Ltd. is formed in a predetermined pattern on the Cr layer, immersed in an aqueous cerium ammonium nitrate solution, and covered with the resist. This is the step of removing.
- an organic functional layer forming step for forming the organic functional layer 17 including at least one light emitting layer is performed.
- the organic functional layer may include a functional layer such as a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer.
- the functional layer may include an inorganic compound such as LiF! / ,.
- the organic functional layer forming step includes, for example, a step of spin-coating a solution of a polyaniline derivative dissolved in an organic solvent of N, N-dimethylformamide (DMF) and added with an acid to form the solution on substantially the entire surface of the substrate. Including. Next, a 250-A-thick Nichido NPD ( ⁇ , ⁇ '-di-1-naphthalenyl-N, ⁇ '-diphenyl- (l, 1, —biphenyl) —4,4, -diamine) A step of sequentially laminating Alq3 (tris (8-hydroxyquinoline) aluminum) having a thickness of 600 A is performed.
- a 250-A-thick Nichido NPD ⁇ , ⁇ '-di-1-naphthalenyl-N, ⁇ '-diphenyl- (l, 1, —biphenyl) —4,4, -diamine
- the laminating step is a step of forming a pixel region using, for example, an evaporation method using a mask.
- the organic functional layer forming step includes a window forming step (FIG. 7D) of partially removing the organic functional layer 17 on the extraction electrode 16 to form the window 18.
- the window forming step is, for example, a step of irradiating the organic functional layer with laser light.
- the wavelength of the laser light it is preferable to use a wavelength having a low light absorption rate of the extraction electrode supporting the organic functional layer and the substrate.
- Laser light extraction electrode This is because it is possible to prevent the organic functional layer from being damaged by the heat generated by being absorbed by the above. For example, light of 532 nm, which is the second harmonic of a YAG laser, can be used.
- the window may be formed by covering the area other than the window with a mask and performing dry etching.
- a cathode forming step of forming a cathode 19 on the organic functional layer 17 is performed.
- the cathode 19 is formed so as to be connected to the extraction electrode 16 through the window 18.
- the cathode can be formed in the same step as the step of forming the anode. Since the base that supports the cathode while being pressed is an organic functional layer that is weak against heat and solvents, it is preferable that the organic functional layer is formed by a process that does not damage the organic functional layer, such as a vapor deposition method.
- the cathode may be made of a material having a small work function, such as Al, an Al—Li alloy, or an Mg—Ag alloy.
- an etching step for etching the organic functional layer 17 is performed using the cathode 19 as a mask.
- the etching process is, for example, a dry etching process.
- the dry etching step is a step of performing etching using, for example, so-called plasma etching, in which oxygen gas converted into plasma is reacted with a resist.
- plasma etching in which oxygen gas converted into plasma is reacted with a resist.
- ozone asshing in which ozone gas is used to react with a resist, may be used.
- a cathode material made of an inorganic material such as a metal has higher etching resistance than an organic functional layer. Therefore, the organic functional layer can be etched using the cathode as a mask.
- the organic EL display panel 20 is obtained.
- the pattern of the display area of the display panel can be formed only by the etching step without performing the mask removing step, so that the number of manufacturing steps can be reduced. Also, the formation of the display area and At the same time, the connection between the cathode and the extraction electrode can be made.
- the anode and the cathode are each formed in a stripe shape, and therefore, are preferably formed in a high-definition pattern. Therefore, the anode forming step and the cathode forming step may include, for example, a step of forming a pattern by laser irradiation. It is also acceptable to include a step of forming a partition having a reverse tapered cross section on the anode.
- the formation of the extraction electrode and the connection between the cathode and the extraction electrode may be performed after the etching step.
- an extraction electrode may be formed, and a connection member for electrically connecting the cathode and the extraction electrode may be provided. If the cathode does not suffer from deterioration or damage due to oxidation, etc., or if the material becomes strong, it is okay to provide no bowing electrode.
- a method for manufacturing an organic EL display panel that emits a plurality of colored lights will be described. As an example, a manufacturing process of a full-color display panel provided with a pixel region emitting three colors of red (R), green (G), and blue ( ⁇ ) is shown.
- the manufacturing process of the full-color display panel as shown in FIG. 8 includes an anode forming step of forming an anode 15 on a substrate (FIG. 8 (a)). After the anode formation step, an organic functional layer containing each of the red (R), green (G), and blue (B) coloring materials is formed.
- the organic functional layer includes a common layer forming step (FIG. 8 (b)) for forming a common layer 21 made of a common material among the above three color developing materials, and a color forming layer containing a different color forming material for each color (FIG. 8B). 22R, 22G, and 22B) in each of the pixel regions (FIG. 8 (c)).
- the common layer forming step is a step of forming a common layer on the entire surface of the substrate by film forming means using a spin coating method or the like.
- the color forming layer forming step is performed by a film forming unit using an inkjet method or the like. This is a step of forming a pattern of a coloring layer on the common layer.
- the color-forming layer may be formed by using a film forming means such as a printing method, a mask, or a vapor deposition method.
- the organic functional layer forming step may be a step of performing the common layer forming step after performing the color forming layer forming step.
- a cathode formation step for forming cathodes (19R, 19G, 19B) in each pixel region and an etching step (FIG. 8 (e)) for performing an etching process using the cathode as a mask ) And are performed in order to obtain the full-color display panel 23.
- the method of manufacturing a full-color display panel may be a manufacturing process as shown in FIG.
- the manufacturing process includes a step of forming a red organic functional layer 24 containing a coloring material that emits red (R) after the anode forming step (FIG. 9A) (FIG. 9B).
- a red cathode forming step (FIG. 9 (c)) for forming a red cathode 19R on the red organic functional layer 24 is performed.
- the red cathode 19R is formed in the red pixel area.
- Etching is performed using the red cathode 19R as a mask to form a red pixel area (Fig. 9 (d)).
- the green organic functional layer containing a coloring material that emits green (G) is disposed by a film forming means using a spin coating method or the like.
- a green cathode forming step (FIG. 9 (e)) for forming a green cathode 19G is performed on the green pixel region of the green organic functional layer 25.
- An etching process is performed using the green cathode 19G as a mask (FIG. 9F) to form a green pixel region.
- a blue organic functional layer 26 containing a coloring material that emits blue (B) is formed, and a blue cathode 19B is formed in the blue pixel region (FIG. 9 (g)). I do.
- Etching is performed using the blue cathode 19B as a mask to form a blue pixel region.
- the manufacturing process of the organic EL display panel includes a sealing process of sealing the organic functional layer. May be. After forming an anode 15, an organic functional layer 17, and a cathode 19 in this order on the substrate 2 as shown in FIG. 10 (FIGS. 10A to 10C), a sealing layer 27 covering the organic functional layer 17 is formed. (FIG. 10 (d)).
- the sealing step may be a step of forming a sealing layer made of silicon nitride by using a CVD method.
- the sealing layer is made of a material having etching resistance.
- the sealing layer preferably has moisture-proof properties. This is because the organic functional layer is covered with the moisture-proof sealing layer, thereby preventing deterioration of the organic functional layer due to moisture.
- an etching step (FIG. 10E) is performed using the sealing layer 27 as a mask to obtain the organic EL display panel 20A.
- the provision of the sealing layer can prevent deterioration of the organic functional layer during etching.
- the sealing step may be a step of sealing the organic functional layer by bonding a sealing can to a substrate.
- a sealing can for example, as shown in FIG. 11, in the sealing step using a sealing can, an anode 15 is provided on the substrate 2 (FIG. 11 (a)), and an organic functional layer 17 is formed on the anode 15 (FIG. 11 (b) ).
- a bonding area forming step (FIG. 11C) in which a part of the organic functional layer 17 is removed to provide a bonding area 28 for bonding the sealing can is performed.
- the adhesion region 28 can be formed by, for example, a dry etching method or a removal method by irradiating a laser beam.
- a cathode forming step (FIG. 11D) is performed, an adhesive 29 is disposed on the bonding area 28, and the sealing can 30 is bonded (FIG. Ll (e)).
- the sealing can 30 is made of a material having a concave portion and having moisture resistance. For example, a glass plate or a stainless steel material may be formed. Alternatively, a desiccant 31 made of BaO may be stuck in the recess.
- the bonding of the sealing can may be performed using, for example, an adhesive containing an ultraviolet curing epoxy resin.
- the adhesive preferably has etching resistance. The etching process is performed using the sealing can 30 as a mask to obtain the organic EL display panel 20B (FIG. Ll (f)).
- a short-circuit prevention layer made of a material having insulating properties may be formed between the end of the cathode and the anode.
- a short-circuit preventing layer forming step for forming the short-circuit preventing layer 32 is performed.
- the short-circuit preventing layer forming step includes, for example, a film forming step in which a polyimide PIX-1400 manufactured by Hitachi Chemical Co., Ltd. is disposed on a substrate by a film forming means using a spin coating method, and the polyimide layer is fixed by heating.
- a pattern forming step of forming a pattern of the polyimide layer is performed.
- a photoresist AZ6112 manufactured by Tokyo Ohka Kogyo Co., Ltd. is formed in a predetermined pattern on the polyimide layer, and the resist is developed and the polyimide layer is etched using NMD-3 manufactured by Tokyo Oka Kogyo Co., Ltd. Performing a step. After etching, the resist is removed by dipping the substrate in butyl acetate and the polyimide layer is fired.
- the organic functional layer forming step (FIG. 12 (c)) and the cathode forming step (FIG. 12 (d)) are sequentially performed. Etching is performed using the cathode 19 as a mask (FIG. 12 (e)) to obtain an organic EL display panel 20C.
- the organic EL display panel of the above embodiment may be configured by providing a substrate, a cathode, an organic functional layer, and an anode in this order.
- the source 'drain electrode forming step for example by sputtering in a thickness of 2000A gold (Au) Film forming process to form a thin film consisting of Forming a resist pattern.
- An etching step is also included, in which the substrate on which the resist pattern is formed is immersed in an eodizing solution to remove the gold not covered by the resist by etching. After the etching step, the substrate is immersed in acetone to remove the resist, and a pattern of a source electrode and a drain electrode is formed on the substrate.
- the source electrode and the drain electrode are made of a low-resistance material.
- metals such as Al, Ag, and Cu, alloys, and conductive polymers may be used.
- an organic semiconductor layer formation step for forming the organic semiconductor layer 35 is performed using a film formation method such as a vapor deposition method.
- the organic semiconductor layer is, for example, a pentacene layer of 100 OA.
- the organic semiconductor layer includes a material having an electron transporting property or a hole transporting property. For example, thiophene, phthalocyanine, oligothiophene, polythiophene or a derivative thereof may be used.
- a gate insulating layer forming step of providing the gate insulating layer 36 (FIG. 13C) is performed.
- the gate insulating layer forming step is a step of forming a 2000 A silicon nitride film by, for example, a sputtering method using a mask. A gate insulating film with a width of lmm in the channel direction is obtained at the channel portion.
- the gate insulating layer be made of a material having high insulation properties.
- inorganic substances such as metal oxides and metal nitrides, and resins such as polyimide and photoresist can be used. These may be combined. Further, it is preferable to have etching resistance.
- An etching step (FIG. 13D) for etching the organic semiconductor layer 35 is performed using the gate insulating layer 36 as a mask.
- the etching step is a step of performing an etching process using a plasma assing method, and for example, a parallel plate type plasma assing apparatus can be used.
- a gate electrode forming step of forming a gate electrode 37 on the insulating layer ( Figure 13 (e)).
- a Cr layer of 1000 A is formed by sputtering using a mask, and a gate electrode pattern having a width of 0.5 mm in the channel length direction is formed in the channel portion.
- the gate electrode forming step may be performed before the etching step.
- the gate electrode In the etching step, the gate electrode may be used as a mask.
- the gate insulating layer forming step does not require a pattern forming step, and the number of steps can be reduced.
- a short-circuit prevention layer for preventing short-circuit between the source or drain electrode and the gate electrode may be provided.
- the step of forming a short-circuit prevention layer for providing a short-circuit prevention layer is performed between the step of forming a source 'drain electrode and the step of forming a gate electrode.
- a short-circuit prevention layer may be provided on the source electrode and the drain electrode after the step of forming the source and drain electrodes.
- the second structure portion includes a mask portion made of a material having etching resistance, and the organic semiconductor layer is patterned by being etched using the mask portion as a mask.
- the organic semiconductor device since the pattern of the organic semiconductor layer is formed using the pattern of the mask portion constituting the organic semiconductor device, the pattern of the mask portion and the pattern of the organic semiconductor layer become inconsistent. Therefore, the organic semiconductor element can be stably manufactured.
- a method of manufacturing a semiconductor device comprising: forming a first structure portion for forming the first structure portion; and forming the organic semiconductor layer on the first structure portion.
- the method includes a mask part forming step and an etching step of performing an etching process on the organic semiconductor layer using the mask part as a mask. Since the mask portion to be formed is a member constituting the organic semiconductor element, the step of removing the mask is not required, so that the number of steps can be reduced.
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Abstract
Description
Claims
Priority Applications (2)
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US10/559,469 US7776645B2 (en) | 2003-06-06 | 2004-06-02 | Organic semiconductor device and its manufacturing method |
JP2005506815A JP4566910B2 (ja) | 2003-06-06 | 2004-06-02 | 有機半導体素子及びその製造方法 |
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US (1) | US7776645B2 (ja) |
JP (1) | JP4566910B2 (ja) |
KR (1) | KR100794612B1 (ja) |
CN (1) | CN100544534C (ja) |
TW (1) | TWI238449B (ja) |
WO (1) | WO2004110105A1 (ja) |
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US7776645B2 (en) | 2010-08-17 |
JPWO2004110105A1 (ja) | 2006-07-20 |
TW200501216A (en) | 2005-01-01 |
CN100544534C (zh) | 2009-09-23 |
CN1802877A (zh) | 2006-07-12 |
US20060246620A1 (en) | 2006-11-02 |
KR20060033724A (ko) | 2006-04-19 |
TWI238449B (en) | 2005-08-21 |
KR100794612B1 (ko) | 2008-01-14 |
JP4566910B2 (ja) | 2010-10-20 |
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