WO2005045939A1 - 薄膜トランジスタ及びその製造方法 - Google Patents
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- WO2005045939A1 WO2005045939A1 PCT/JP2004/010759 JP2004010759W WO2005045939A1 WO 2005045939 A1 WO2005045939 A1 WO 2005045939A1 JP 2004010759 W JP2004010759 W JP 2004010759W WO 2005045939 A1 WO2005045939 A1 WO 2005045939A1
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
- H10K85/113—Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
-
- 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
- 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]
- H10K10/466—Lateral bottom-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
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/191—Deposition of organic active material characterised by provisions for the orientation or alignment of the layer to be deposited
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
Definitions
- the present invention relates to a thin film transistor and a method for manufacturing the same, and more particularly to a thin film transistor using a 7 ⁇ -conjugated organic semiconductor having an orientation formed as a semiconductor layer, and a method for manufacturing the same.
- TFTs thin film transistors
- a current flowing between a source electrode and a drain electrode provided in contact with the semiconductor layer is insulated from the semiconductor layer. It is configured to be controlled by the voltage applied to the gate electrode provided via the layer (that is, the electric field generated by the applied voltage).
- semiconductor materials that are currently put into practical use include amorphous silicon, which is relatively inexpensive in terms of characteristics as compared with crystalline silicon, but is relatively inexpensive. Semiconductor materials.
- examples of insulating materials that are currently in practical use include silicon oxide and silicon nitride.
- the TFT manufacturing process using these semiconductor materials and insulating materials requires a large-scale apparatus such as a plasma CVD method and a thin-film control apparatus for precision processing. Therefore, the manufacturing cost of TFT is high.
- the manufacturing process generally includes a process at a processing temperature exceeding 350 ° C., there is a limitation on usable substrate materials and the like.
- an organic semiconductor composed of an organic compound has attracted attention as a semiconductor material that can be used for TFT.
- This organic semiconductor is a low-cost process and a low-temperature process, compared to the case where an inorganic semiconductor such as amorphous silicon or low-temperature polysilicon is used.
- the semiconductor layer can be formed by a manufacturing process such as spin coating, inkjet printing, and immersion coating. Therefore, the manufacturing cost of the TFT can be reduced, and restrictions on usable substrate materials and the like are eliminated.
- the low-cost process and the low-temperature process described above it is possible to form a TFT on a flexible substrate and a large-area substrate. Or, it is expected to be used for paper-like displays or wireless ID tags.
- currently reported organic semiconductors have lower carrier mobilities than the aforementioned inorganic semiconductors. Therefore, various efforts have been made to achieve carrier mobility comparable to that of amorphous silicon.
- a 7T conjugated organic semiconductor is composed of an organic compound having a molecular skeleton having a 7T conjugated double bond. It is considered that semiconductor characteristics can be obtained by the valence band and conduction band generated by the overlap of 7t orbitals in the ⁇ -shared double bond, and the band gap between them.
- the ease of electric conduction depends on the electric conductivity along the main chain direction in the molecule, Electric conduction using the overlap of ⁇ orbitals, and electric conduction by hobbing of electrons between molecules are in order.
- polytetrafluoroethylene is pressed onto the substrate at a constant pressure and slides to align.
- a method of forming an oriented film by contacting a polytetrafluoroethylene compound on the upper surface of a polytetrafluoroethylene film which has been formed and oriented is disclosed (for example, Japanese Patent Laid-Open Publication No. 7-2). No. 0 659 9).
- a method has been disclosed in which a ⁇ -conjugated oligomer molecule is oriented and grown by using a hot-wall-epitaxy method (for example, Japanese Patent Laid-Open Publication No. 2002-270720). No.). By using these alignment methods, it becomes possible to minimize the electric conduction due to the hobbing of the electrons between the molecules.
- the orientation direction of the ⁇ -conjugated organic semiconductor molecule is controlled so as to be parallel to a perpendicular line connecting the zose electrode and the drain electrode of TFTF.
- a method of effectively utilizing electric conduction along the main chain direction in the molecule or a method for example, Japanese Patent Laid-Open Publication No. 5-2775695, and Japanese Patent Publication : Japanese Patent Application Laid-Open No. 2003-52028874
- the orientation direction of the ⁇ -conjugated organic semiconductor molecules is controlled so as to be perpendicular to the vertical line connecting the source electrode and the drain electrode of TFTF. Accordingly, there has been proposed a method of effectively utilizing electric conduction utilizing the 7t orbital overlap between adjacent molecules (for example, Japanese Patent Laid-Open Publication No. 9-111). No. 6163).
- the orientation direction of the ⁇ -conjugated organic semiconductor molecule is controlled so as to be parallel to the straight line connecting the source electrode and the drain electrode of the TFT.
- the distance between the source electrode and the drain electrode is smaller than the length of the main chain of the ⁇ -conjugated organic semiconductor molecule.
- the number of electron transfers between ⁇ -conjugated organic semiconductor molecules increases with the distance.
- the movement of electrons between the ⁇ -conjugated organic semiconductor molecules which are adjacent to each other in the direction perpendicular to the perpendicular line connecting the source electrode and the drain electrode is caused by the electric field between the source electrode and the drain electrode.
- Electrons move in a direction orthogonal to the direction in which they are formed. It has to be moved, which is very difficult.
- a T-conjugated organic semiconductor molecule having a very long molecular length compared to the distance between the source electrode and the drain electrode is used, or when compared to the molecular length of the redundant conjugated organic semiconductor molecule, except when the distance from the drain electrode is sufficiently small, the orientation direction of the ⁇ -conjugated organic semiconductor molecules is controlled so as to be parallel to the vertical line connecting the source electrode and the drain electrode of the TFT. However, it is not possible to obtain sufficient carrier mobility.
- the orientation direction of the 7 ⁇ -conjugated organic semiconductor molecules is controlled so as to be perpendicular to the vertical line connecting the source electrode and the drain electrode of the TF ⁇ , whereby adjacent 7 ⁇ -conjugated organic semiconductor molecules are aligned with each other.
- the longitudinal direction of the main chain of the ⁇ -conjugated organic semiconductor molecule is aligned perpendicular to the perpendicular line connecting the source electrode and the drain electrode.
- the number of electron movements increases in proportion to the increase in the distance.
- the orientation direction of the ⁇ -conjugated organic semiconductor molecule is controlled to be perpendicular to the perpendicular line connecting the source electrode and the drain electrode of TF, and the orientation degree is increased, the carrier mobility can be improved. Has limitations.
- the present invention has been made in order to solve the above-mentioned problems, and has been made of a TFT having improved carrier mobility constituted by forming ⁇ -conjugated organic semiconductor molecules in a predetermined direction and a method of manufacturing the TFT. Its primary purpose is to provide.
- the present invention also provides an active matrix type display in which a plurality of TFs with improved carrier mobility are arranged, a wireless ID tag using the TF with improved carrier mobility in an integrated circuit unit, A portable television using the TF II having an improved carrier mobility in an integrated circuit unit,
- the second objective is to provide portable devices such as communication terminals, PDAs, and portable medical devices.
- a TFT according to the present invention is a thin film transistor having a semiconductor layer and a source region and a drain region separately provided so as to face the semiconductor layer.
- the semiconductor layer has a ⁇ -conjugated organic semiconductor molecule as a main component, and the 7 ⁇ -conjugated organic semiconductor molecule is oriented so that ⁇ orbitals substantially face each other, and a main chain molecule.
- a configuration is adopted in which the axis is inclined with respect to the direction of the electric field in the channel formed in the semiconductor layer.
- a source region and a drain region mean a source electrode and a drain electrode, and a contact layer or a high-concentration impurity region (layer) connecting the source electrode and the drain electrode to a semiconductor layer.
- the concept that includes. With this configuration, charge transfer along the main chain direction in the 7U conjugated organic semiconductor molecule and charge transfer using the overlap of ⁇ orbits from the source region where the electric field is applied to the drain region are realized.
- the source region and the drain region are separately provided so as to have sides facing each other in the semiconductor layer, and the ⁇ -conjugated organic semiconductor molecule is arranged such that the molecular axis of the main chain is perpendicular to the facing side. It adopts a configuration in which it is tilted and oriented with respect to various directions. Further, a source region and a drain region are provided separately in the semiconductor layer so as to have surfaces facing each other in the thickness direction of the semiconductor layer, and the ⁇ -conjugated organic semiconductor molecule is formed in the main chain. A configuration is adopted in which the molecular axis is inclined with respect to the direction perpendicular to the surface facing the above.
- the molecular axis of the main chain of the C-conjugated organic semiconductor molecule is oriented at an angle with respect to the direction perpendicular to the side opposite to the source region and the drain region.
- the conduction along the main chain direction in the inside is effectively used in the charge transfer between the source region and the drain region.
- the ⁇ orbitals between adjacent ⁇ -conjugated organic semiconductor molecules are They are formed so as to face each other in the direction from the region to the drain region.Therefore, the electric charge transfer between molecules is not by hobbing but by using the overlap of ⁇ orbits from the source region where the electric field is applied to the drain region. Charge transfer is dominant. Therefore, it is assumed that TF with high carrier mobility can be realized.
- the semiconductor device further includes a gate electrode provided on at least one surface of the semiconductor layer with a gate insulating layer interposed therebetween, and the ⁇ conjugate in a state where a voltage equivalent to the time when the thin film transistor is applied to the gate electrode is applied.
- the ⁇ -conjugated organic semiconductor molecule is The direction in which the molecular axis of the main chain is inclined at an angle of 0 calculated by the formula (1) with respect to the direction perpendicular to the side or the surface facing the source region and the drain region is substantially the orientation direction. It is preferable to adopt a configuration in which they are oriented as follows. According to such a configuration, the state when the thin film transistor is turned on (the source region and the drain region are formed based on the direction in which the conductivity is highest), so that a TFT with even higher carrier mobility is realized. I can do it.
- the molecular axis of the main chain of the t-conjugated organic semiconductor molecule is oriented in a plane substantially parallel to the main surface of the semiconductor layer, and the orientation range is the angle> It is preferable to adopt a configuration of ⁇ 10 °. With this configuration, a TFT having high carrier mobility can be realized for a material in which the molecular axis of the main chain of the ⁇ -conjugated organic semiconductor molecule can be oriented in a plane substantially parallel to the main surface of the semiconductor layer. I do.
- the present invention provides the ⁇ -conjugated organic semiconductor molecule, wherein the main chain is oriented such that the molecular axis of the main chain does not exist in a plane substantially parallel to the main surface of the semiconductor layer. It is preferable to adopt a configuration having an angle of 0 ⁇ 5 °. With this configuration, the molecular axis of the main chain of the ⁇ -conjugated organic semiconductor molecule is It is assumed that a TFT having a high carrier mobility can be realized for a material that can be oriented at a predetermined angle with respect to a plane substantially parallel to the plane.
- the present invention preferably adopts a configuration in which the extending directions of the ⁇ orbitals in the ⁇ -conjugated organic semiconductor molecule are not all unified in the same vector direction.
- the extending directions of the ⁇ orbitals in one ⁇ -conjugated organic semiconductor molecule are not all unified in the same vector direction. It is assumed that the 7 ° orbital between ⁇ -conjugated organic semiconductor molecules can be easily opposed.
- the present invention more preferably adopts a configuration in which the 7C conjugated organic semiconductor molecule is crystalline.
- the degree of orientation of the ⁇ -conjugated organic semiconductor molecules can be increased as compared with the case where amorphous molecules are used, so that a TFT with even higher carrier mobility can be realized.
- a method of manufacturing a TF according to the present invention is a method of manufacturing a thin film transistor having a semiconductor layer, and a source region and a drain region provided separately from each other so as to face the semiconductor layer.
- the ⁇ -conjugated organic semiconductor molecule is used as a main component in the semiconductor layer, the ⁇ -conjugated organic semiconductor molecule is oriented so that ⁇ orbits are substantially opposed to each other, and the molecular axis of the main chain is the semiconductor layer.
- a configuration is adopted in which the liquid crystal molecules are oriented in a direction inclined with respect to the direction of the electric field in the channel formed in the device. With this configuration, charge transfer along the main chain direction in the ⁇ -conjugated organic semiconductor molecule and charge transfer utilizing the overlap of ⁇ orbits from the source region where the electric field is applied to the drain region are effective. It is assumed that TFTs with high carrier mobility can be realized.
- a source region and a drain region are separately provided so as to have sides facing each other in the semiconductor layer, and the 7T conjugated organic semiconductor molecule is arranged such that the molecular axis of the main chain is perpendicular to the facing side. It adopts a configuration in which it is tilted with respect to the direction. Further, a source region and a drain region are provided separately in the semiconductor layer so as to have surfaces facing each other in the thickness direction of the semiconductor layer, and the 7 ⁇ -conjugated organic semiconductor molecule is provided in the main chain. A configuration is adopted in which the molecular axis is inclined and oriented with respect to the direction perpendicular to the opposite surface.
- the molecular axis of the main chain of the ⁇ -conjugated organic semiconductor molecule is oriented at an angle with respect to the direction perpendicular to the opposite sides of the source region and the drain region. It is assumed that conduction along the main chain direction in the organic semiconductor molecule is effectively used in charge transfer between the source region and the drain region. Also, the trajectories of adjacent conjugated organic semiconductor molecules are formed so as to oppose each other in the direction from the source region to the drain region. Therefore, the movement of the charge between the molecules is not hobbing but the source region where the electric field is applied. The main charge transfer is based on the overlap of redundant orbits in the direction from the drain region to the drain region. Therefore, it is assumed that TF II with high carrier mobility can be manufactured.
- the semiconductor device has a gate electrode provided on at least one surface of the semiconductor layer with a gate insulating layer interposed therebetween, and the gate electrode is supplied with a voltage equivalent to that when the thin film transistor is turned on.
- the ⁇ -conjugated organic semiconductor is The direction in which the molecular axis of the main chain of the semiconductor molecule is inclined at an angle 0 calculated by the formula (1) with respect to the direction perpendicular to the side or the surface facing the source region and the drain region is substantially It is preferable to adopt a configuration in which alignment is performed as the alignment direction.
- the present invention provides the ⁇ -conjugated organic semiconductor molecule, wherein a molecular axis of a main chain of the ⁇ -conjugated organic semiconductor molecule is oriented so as to exist in a plane substantially parallel to a main surface of the semiconductor layer; It is preferable to adopt a configuration of 0 ⁇ 10 °. With this configuration, it is possible to manufacture a TFT having high carrier mobility for a material in which the molecular axis of the main chain of the 7 ⁇ -conjugated organic semiconductor molecule can be oriented in a plane substantially parallel to the main surface of the semiconductor layer. I can do it.
- the present invention provides the 7 ° conjugated organic semiconductor molecule, wherein the molecular axis of the main chain is oriented so as not to be in a plane substantially parallel to the main surface of the semiconductor layer, and the orientation range is set to the angle. It is preferable to adopt a configuration of 0 ⁇ 5 °. With this configuration, a material in which the molecular axis of the main chain of the ⁇ -conjugated organic semiconductor molecule can be oriented at a predetermined angle with respect to a plane substantially parallel to the main surface of the semiconductor layer has a high carrier mobility. Can be manufactured.
- the present invention uses, as the ⁇ -conjugated organic semiconductor molecule, any one of thiophene, acetylene, pyrrole, phenylene, and acene, or a derivative having a main chain of a molecular skeleton obtained by combining these. Take the configuration. It is assumed that such a configuration can realize charge transfer of a 7T conjugate system having excellent carrier mobility.
- An active matrix display using a thin film transistor according to the present invention is characterized in that the thin film transistor according to any one of claims 1 to 9 includes a plurality of thin film transistors as switching elements for driving pixels. It adopts a configuration that is provided. According to this configuration, it is possible to realize a low-cost, good-characteristic or paper-like display.
- a wireless ID tag using a thin film transistor according to the present invention has a structure in which the thin film transistor according to any one of claims 1 to 9 is used as a semiconductor element for forming an integrated circuit. take.
- wireless ID tags can be attached to objects or materials of various shapes. Can be It is also assumed that a wireless ID tag that can be formed into an arbitrary shape can be realized.
- a portable device using the thin film transistor according to the present invention is configured such that the thin film transistor according to any one of claims 1 to 9 is used as a semiconductor element for forming an integrated circuit.
- the portable device include a portable television, a communication terminal, a PDA, a portable medical device, and the like.
- the present invention is not limited to these portable devices, and includes, for example, any portable devices such as portable AV devices and portable computers. With this configuration, it is assumed that advantages such as low cost, flexibility, impact resistance, and being able to be formed into an arbitrary shape can be added to portable devices such as a mobile TV, a communication terminal, a PDA, and a portable medical device.
- FIG. 1 is a cross-sectional view schematically showing each of the first representative configurations of the TFT.
- FIG. 2 is a cross-sectional view schematically showing each of the second representative configurations of the TFT.
- Figure 3 is a diagram showing the structure of oligothiophene derivative molecules, which are 7T conjugated organic semiconductor molecules used for the semiconductor layer.
- Figure 3A shows the chemical structural formula.
- Figure 3B shows the state of the bond and the ⁇ electron cloud.
- FIG. 3C is a perspective view schematically showing molecules.
- FIG. 4 is a perspective view schematically showing an orientation state of oligothiophene derivative molecules in a semiconductor layer.
- FIG. 5 is a schematic diagram showing a configuration of a measurement sample for measuring the carrier mobility of T F ⁇ .
- FIG. 6 shows the measurement of the change in carrier mobility when the orientation angle of the oligothiophene derivative molecule was changed when various gate voltages were applied.
- FIG. 6A shows the measurement result when the gate voltage is 20 V
- FIG. 6B shows the measurement result when the gate voltage is 30 V
- FIG. 6C shows the measurement result when the gate voltage is 30 V.
- the measurement results when the gate voltage is 40 V are shown.
- FIG. 7 is a graph showing the results of measuring the change in TFT carrier mobility using an oligothiophene derivative molecule having six five-membered rings and both terminals chemically modified with alkyl groups.
- FIG. 8 is a diagram showing the structure of pen-based benzene, which is a conjugated organic semiconductor molecule used for the semiconductor layer.
- FIG. 8A shows the chemical structural formula of pen-based benzene
- FIG. 8C is a perspective view schematically showing Benzensen, showing the state of the bond and the ⁇ electron cloud.
- FIG. 9 is a perspective view schematically showing the orientation state of pen-sensing in the semiconductor layer.
- Figure 10 is a graph showing the results of measuring the change in carrier mobility when the orientation angle of the pen is changed when various gate voltages are applied.
- Figure 10 1 shows the gate voltage.
- Fig. 10B shows the measurement results when the gate voltage was 40 V, and
- Fig. 10B shows the measurement results when the gate voltage was 40 V.
- FIG. 11 is a perspective view schematically showing a configuration of an active matrix type display using an organic EL for a display section.
- FIG. 12 is an enlarged schematic diagram showing the configuration of the TFT drive circuit unit.
- FIG. 13 is a perspective view schematically showing a configuration of a wireless ID tag using the TFT according to the present embodiment.
- FIG. 14 is a front view schematically showing a configuration of a portable television using the TFT according to the present embodiment.
- FIG. 15 is a front view schematically showing a configuration of a mobile phone using the TFT according to the present embodiment.
- FIG. 16 is a perspective view schematically showing a configuration of a portable medical device using the TFT according to the present embodiment.
- FIG. 1 is a cross-sectional view schematically showing each of the first representative configurations of the TFT.
- FIGS. 1A to 1D various configurations are conceivable as the configuration of TFT 100 according to the present embodiment.
- the components include a substrate 11, a gate electrode 12, a gate insulating layer 13, a semiconductor layer 14, a source electrode 15, and a drain electrode 16.
- FIG. 1A and FIG. 1B are generally called a potter gate method.
- 1C and 1D are called a top gate method.
- FIG. 1A and FIG. 1C are also called a top contact method because of the positional relationship between the semiconductor layer 14 and the source electrode 15 and the drain electrode 16.
- 1B and 1D are also called a bottom contact method.
- the TFT 100 shown in FIGS. 1A to 1D is called a horizontal TFT because the source electrode 15 and the drain electrode 16 are arranged so as to face in a horizontal direction in a sectional view. ing.
- 2A and 2B are cross-sectional views schematically showing each of the second typical configurations of the TFT.
- the substrate 11, the gate electrode 12, the gate insulating layer 13, The provision of the semiconductor layer 14, the source electrode 15, and the drain electrode 16 makes the TFT 100 shown in FIG. 1A to FIG. This is basically the same.
- the source electrode 15 and the drain electrode 16 form the semiconductor layer 14 in the film thickness direction ( (In the vertical direction). For this reason, the TFT 200 is called a vertical TFT.
- the effect obtained by the present invention is obtained by controlling the orientation direction of the ⁇ -conjugated organic semiconductor molecules used for the semiconductor layer in a direction appropriate to the arrangement of the source electrode and the drain electrode.
- the configuration of the TFT itself may be any of the configurations shown in FIGS. 1 and 2, that is, it is not limited to any configuration. Therefore, in the following description, a case where the configuration of T F ⁇ ⁇ ⁇ 100 of the top gate type shown in FIG. 1C is applied as a typical example of the configuration of TFT.
- the TF ⁇ 100 adopting the top gate method comprises a substrate 11, a semiconductor layer 14 composed of ⁇ -conjugated organic semiconductor molecules, a source electrode 15, and a drain electrode 15. 16, a gate insulating layer 13, and a gate electrode 12.
- a semiconductor layer 14 is provided on the main surface of the substrate 11, and a source electrode 15 and a drain electrode 16 are provided on the semiconductor layer 14 so as to be separated from each other.
- a gate insulating layer 13 is provided so as to cover the source electrode 15 and the drain electrode 16 and the exposed surface of the semiconductor layer 14.
- the gate electrode 12 is provided on the gate insulating layer 13 so as to be located at least between the source electrode 15 and the drain electrode 16 in plan view.
- the TF layer 100 adopting the top gate method shown in FIG. 1C has a semiconductor layer 14, a source electrode 15, a drain electrode 16, and a gate insulating layer 13 laminated on a substrate 11.
- the gate electrode 12 is provided on the gate insulating layer 13.
- a C-conjugated organic semiconductor molecule dissolved and dispersed in a predetermined solvent is flattened in a desired orientation direction in advance. It is applied on a substrate 11 having grooves formed in rows. Then, the substrate 11 coated with the ⁇ -conjugated organic semiconductor molecules is sufficiently dried to form a semiconductor layer 14 made of ⁇ -conjugated organic semiconductor molecules on the substrate 11 in an oriented manner.
- a predetermined electrode material is pre-patterned so as to obtain a desired shape. After printing by using the screen plate, dry it thoroughly.
- the source electrode 15 and the drain electrode 16 having desired shapes are formed on the semiconductor layer 14.
- a predetermined insulating material is printed on the source electrode 15, the drain electrode 16, and the semiconductor layer 14 by using a pre-patterned screen plate. Dry thoroughly.
- a gate insulating layer 13 having a desired shape is formed on the semiconductor layer 14, the source electrode 15 and the drain electrode 16.
- a predetermined electrode material is pre-patterned to obtain a desired shape. After printing by using a plate, it is dried thoroughly. As a result, a gate electrode 12 having a desired shape is formed on the gate insulating layer 13.
- the TF 100 is formed by printing the semiconductor layer 14, the source electrode 15 and the drain electrode 16, the gate insulating layer 13, and the gate electrode 12 on the substrate 11 using a screen plate. It is formed by printing by a method and then drying it sufficiently.
- a polyethylene-based plastic substrate was used as a material constituting the substrate 11.
- an oligothiophene derivative molecule which is one of the ⁇ -conjugated organic semiconductor molecules, was used as a material for forming the semiconductor layer 14.
- an electrode material mainly composed of poly 3,4-ethylenedioxythiophene hereinafter, referred to as PEDOT
- PEDOT poly 3,4-ethylenedioxythiophene
- the material constituting the gate insulating layer 13 is In this case, polyvinyl phenol was used.
- oligothiophene derivative molecule which is a ⁇ -conjugated organic semiconductor molecule used for the semiconductor layer 14 will be described in detail.
- FIG. 3 is a diagram showing the structure of an oligothiophene derivative molecule, which is a ⁇ -conjugated organic semiconductor molecule used for the semiconductor layer 14.
- Fig. 3 ⁇ ⁇ shows the chemical structural formula of the oligothiophene derivative molecule
- Fig. 3 ⁇ ⁇ shows the state of ⁇ bond and ⁇ electron cloud in the oligothiophene derivative molecule
- Fig. 3C schematically shows the oligothiophene derivative molecule. It is a perspective view shown in FIG. In FIG. 3, the description of the chemical structure of the terminal of the main chain of the oligothiophene derivative molecule is omitted.
- a ⁇ electron cloud 23 exists in a direction perpendicular to each five-membered ring surface composed of carbon atoms 21 and sulfur atoms 22. ing.
- the ⁇ electron cloud 23 since the five-membered rings do not exist in the same plane but are slightly twisted and bonded by the splice bond, the ⁇ electron cloud 23
- the vectors that indicate the direction of existence of a cell are not standardized in a certain direction.
- an oligothiophene derivative molecule in which the terminal of the main chain of the oligothiophene molecule is chemically modified with a predetermined substituent is actually used. Specifically, as shown in Fig.
- an oligothiol that has eight five-membered rings containing a sulfur atom and whose both ends of the main chain are chemically modified with an alkyl group (for example, —C 10 H 21 ) A phen derivative molecule is used.
- a method of studying the orientation angle of the oligothiophene derivative molecule which characterizes the present invention, and the study results will be described. Note that in the following description In Fig. 3C, one molecule of an oligothiophene derivative molecule is represented by a rectangular box as shown in Fig. 3C. Also, it is assumed that the C electron cloud exists in a direction that is substantially perpendicular to this square plane, although not all vectors indicating the direction of its existence are actually unified.
- FIG. 4 is a perspective view schematically showing an orientation state of the oligothiophene derivative molecule 40a in the semiconductor layer 40 obtained by the above-described manufacturing method.
- the plane formed by the X and Y axes represents a plane parallel to the main surface of the semiconductor layer 40, and the Z axis direction indicates the thickness direction of the semiconductor layer 40.
- the oligothiophene derivative molecule 40a is oriented such that the molecular axis of its main chain is parallel to the Y-axis direction, and a square representing each molecular plane is formed by the YZ axis. It is arranged so as to be parallel to the plane to be set. That is, the semiconductor layer 40 is configured such that the T orbitals of the adjacent oligothiophene derivative molecules are opposed to each other in directions other than the Y-axis direction and the Z-axis direction, that is, in the X-axis direction.
- the source electrode and the drain each having a rectangular shape with respect to the Y-axis direction, which is the orientation direction of the oligothiophene derivative molecule 40a, using the semiconductor layer 40 thus oriented and formed, as shown in FIG.
- Each of the TFTs 100 was fabricated by tilting the perpendicular line 10 common to the opposing sides of the electrode 10 by 10 °, that is, each of the oligothiophene derivative molecules 40a had substantially the ⁇ orbital. They were oriented so as to face each other, and the molecular axes of the main chains were each inclined at an angle of 10 ° with respect to the direction perpendicular to the side facing the source electrode and the drain electrode.
- each of the manufactured TFs 100 is a plastic substrate 41, a semiconductor layer 42 composed of the semiconductor layer 40 of FIG. 4, a source electrode 43, and a drain electrode. 4, an insulating layer 45, and a gate electrode 46.
- the arrow 47 indicates the orientation direction of the oligothiophene derivative molecule (not shown in FIG. 5) in the semiconductor layer 42.
- the carrier mobility of the TFT 100 was obtained by measuring the I-V characteristics when various gate voltages were applied to the gate electrode. .
- FIG. 6 is a graph showing the results of measuring the change in carrier mobility when the orientation angle of the oligothiophene derivative molecule was changed when various gate voltages were applied.
- Fig. 6 ⁇ shows the measurement results when the gate voltage is 20 V
- Fig. 6B shows the measurement results when the gate voltage is 30 V
- Fig. 6C shows the measurement results when the gate voltage is 30 V.
- the measurement results at 40 V are shown.
- the horizontal axis represents the angle between the molecular axis of the main chain of the oligothiophene derivative molecule and the perpendicular to the opposite side of the source electrode and the drain electrode
- the vertical axis represents the carrier mobility ( cm 2 / V sec).
- the conductivity ⁇ 1 is 7.7 X 10 -3 SZm
- the conductivity H 2 is 1.9 X 10 “3
- the orientation angle was 90 °, the carrier mobility was the lowest.
- the carrier mobility increases as the orientation angle of the oligothiophene derivative molecule becomes larger than 0 °, as in the case where the gate voltage is 20 V.
- the orientation angle exceeded 90 °, the carrier mobility gradually decreased.
- the orientation angle was 90 °, the carrier mobility became the lowest.
- the carrier mobility is improved as the orientation angle of the oligothiophene derivative molecule becomes larger than 0 °, as in the case where the gate voltages are 20 V and 30 V. When the orientation angle exceeds 90 °, the carrier mobility gradually decreases. When the orientation angle is 90 °, the carrier mobility becomes the lowest.
- the orientation angle of the oligothiophene derivative molecule is 90 °, that is, the molecular axis of the main chain of the oligothiophene derivative molecule is in a direction perpendicular to the side opposite to the source electrode and the drain electrode. It was found that the carrier mobility was the lowest when it was perpendicular to it. 6A to 6C, the carrier mobility in the hatched region is that when the orientation angle of the oligothiophene derivative molecule is 0 °, that is, when the oligothiophene derivative molecule moves from the source electrode to the drain electrode. It was found that the ⁇ orbital between adjacent molecules in the direction toward the electrode was improved compared to the case where they were not formed so as to face each other.
- the orientation angle at which the highest carrier mobility can be obtained is calculated by using the conductivity ⁇ 1 when the orientation angle is 0 ° and the conductivity ⁇ 2 when the orientation angle is 90 ° as follows: ) Is found to be near 0 calculated by Further, as a result of further investigation on a preferable range of the orientation angle of the oligothiophene derivative molecule, as shown in FIGS. 6A to 6C, a range of ⁇ 10 ° centered on 0 calculated by the equation (1) is obtained. It turned out to be the most suitable.
- the oligothiophene derivative molecule used for the semiconductor layer 40 has six five-membered rings, and has an alkyl group at both ends (for example, one C 10 H 2 i).
- a similar measurement sample was prepared and measured.
- Figure 7 shows the measurement results.
- the measurement results shown in FIG. 7 show the measurement results when the gate voltage is 30 V. Note that the horizontal axis and the vertical axis in FIG. 7 are the same as those in FIG.
- the ⁇ -conjugated organic semiconductor molecule used for the semiconductor layer has eight or six five-membered rings, and each terminal is an alkyl group (for example, -C 10 H 2 l).
- the effect of the present invention is not limited to a material having such a structure. That is, the effect obtained by the present invention is expressed by the positional relationship between the arrangement direction of the source electrode and the drain electrode of the TFT and the orientation direction of the semiconductor layer. Similar effects can be obtained even when semiconductor molecules are used.
- a polythiophene derivative having a different number of five-membered rings may be used, or the terminal modifying group may be replaced with another appropriate one. It is also possible to change to a suitable substituent. Further, a modifying group may be introduced not in the terminal but in the middle of the main chain.
- the squares representing the oligothiophene derivative molecules are schematically shown as being arranged parallel to the plane formed by the YZ axes, but all the squares representing the molecular planes are completely formed by the XY axes. It does not need to be upright with respect to the plane.
- the molecular plane may be slightly inclined, and the inclination does not need to be uniform.
- the vector direction indicating the existence direction of the 7 ⁇ electron cloud is not unified in one direction, such as the oligothiophene derivative molecule used in this example, the allowable range of the inclination becomes wider.
- the effect of facilitating the production of the TF according to the present invention is obtained.
- TF 100 having the configuration shown in FIG. 1 is adopted.
- the effects of the present invention can be obtained by controlling the orientation of the semiconductor layer at an appropriate angle with respect to the plane of the substrate. Therefore, the configuration of ⁇ FT100 itself is not limited to the configuration shown in FIG. 1B.
- the TF ⁇ 100 employing the bottom gate method is composed of a substrate 11, a gate electrode 12, a gate insulating layer 13, and a source electrode 15. , A drain electrode 16 and a semiconductor layer 14 made of 7t conjugated organic semiconductor molecules.
- a gate electrode 12 is provided on the main surface of the substrate 11, and the gate insulating layer 13 is formed so as to cover the exposed surfaces of the gate electrode 12 and the substrate 11. Is provided.
- a source electrode 15 and a drain electrode 16 are provided on the gate insulating layer 13 so as to be located on both sides of the gate electrode 12 in plan view. Then, the source electrode 5 and the drain electrode 6 are connected to the exposed surface of the gate insulating layer 13.
- the semiconductor layer 14 is provided so as to cover it.
- the TFT 100 adopting the bottom gate method shown in FIG. 1B has a gate electrode 12, a gate insulating layer 13, a source electrode 15, and a drain electrode 1 on a substrate 11. 6, and the semiconductor layer 14 are sequentially laminated.
- a predetermined electrode material is formed on the substrate 11 by a vacuum deposition method and then patterned.
- a gate electrode 12 having a predetermined shape is formed at a predetermined position on the substrate 11.
- a predetermined insulating material is applied by a spin coating method and then dried sufficiently.
- a predetermined electrode material is formed by a vacuum evaporation method and then patterned. As a result, a source electrode 15 and a drain electrode 16 having a predetermined shape are formed on the gate insulating layer 13.
- a ⁇ -conjugated organic semiconductor molecule is formed by a vacuum evaporation method and then patterned.
- the angle between the molecular axis of the 7 ⁇ -conjugated organic semiconductor molecule and the plane of the substrate 11 was controlled by adjusting the film forming conditions.
- the direction of the overlap is uniform for each grain in normal film formation, but the direction is random for each grain as a whole layer.
- an orientation layer is applied and dried on the gate insulating layer 13 serving as a base, so that uniform layering of molecules can be obtained as a whole layer.
- ⁇ F ⁇ 100 is obtained by depositing the gate electrode 12, the gate insulating layer 13, the source electrode 15, the drain electrode 16, and the semiconductor layer 14 on the substrate 11 by vacuum deposition. It is formed by film formation and coating by a method or a spin coating method.
- TF 100 in this example a polyethylene-based plastic substrate was used as a material for forming the substrate 11. Also, the gate electrodes 1 and 2 Gold (hereinafter, Au) was used as a constituent material. In addition, as a material for forming the gate insulating layer 13, polyvinyl phenol was used. Au was used as a material for forming the source electrode 15 and the drain electrode 16. As a material for forming the semiconductor layer 14, pen-sen, which is one of the ⁇ -conjugated organic semiconductor molecules, was used.
- pentacene which is a ⁇ -conjugated organic semiconductor molecule used for the semiconductor layer 14, will be described in detail.
- FIG. 8 is a diagram showing the structure of pentacene, which is a ⁇ -conjugated organic semiconductor molecule used for the semiconductor layer 14.
- Fig. 8 ⁇ shows the chemical structural formula of Pensene-sen
- Fig. 8B shows the state of the bond and ⁇ electron cloud in pentacene
- Fig. 8C is a perspective view schematically showing Pensene-sen. .
- a ⁇ -conjugated system composed of repeating six-membered rings with multiple double bonds has developed.
- the hydrogen atom is not specified.
- the electronic state is calculated using a method such as the molecular orbital method, the existence range of the electron cloud of ⁇ electrons used for the T bond in the double bond can be obtained.
- a t electron cloud 73 exists in a direction perpendicular to each of the six-membered ring surfaces composed of carbon atoms 71. Since the six-membered rings exist in the same plane in this Pennsensen, the vector indicating the direction in which the ⁇ electron cloud 73 exists is unified to the direction perpendicular to the square plane shown in Fig. 8C. Have been.
- Pen-Sen is represented by a rectangular rectangle as shown in FIG. 8C.
- FIG. 9 is a perspective view schematically showing an orientation state of pentacene 48a in the semiconductor layer 48 obtained by the above-described manufacturing method.
- the plane formed by the XY axes represents a plane parallel to the main surface of the semiconductor layer 48
- the Z-axis direction represents the thickness direction of the semiconductor layer 48.
- pen sen 48 a is located on a plane in which the molecular axis of the main chain is formed by the XY axes. Are arranged so that the squares representing the respective molecular planes face each other in a direction parallel to the X-axis. Note that the source electrode and the drain electrode make any angle to the semiconductor layer 48 thus formed.
- the pentacene 48a is also formed such that the X-axis direction is the channel direction.
- the carrier mobility of the TFT 100 was obtained by measuring the I-V characteristics when various gate voltages were applied to the gate electrode. . Also, the angle ⁇ . Is 0 °, the conductivity between the source electrode and the drain electrode (ie, equivalent to the conductivity ⁇ 1 in the direction represented by the molecular axis of the main chain of the ⁇ -conjugated organic semiconductor molecule) is formed.
- FIG. 10 is a graph showing the results of measuring the change in carrier mobility when the orientation angle of the pen is changed when various gate voltages are applied.
- FIG. 10 ⁇ shows the measurement results when the gate voltage is 20 V
- FIG. 10B shows the measurement results when the gate voltage is 40 V.
- the horizontal axis and the vertical axis in FIG. 10 are the same as those in FIG.
- the conductivity 1 is 3.2 X 10-3 SZm
- the conductivity 2 is 6.3 X It was 10 -2 SZm.
- the carrier mobility of the semiconductor layer 48 is such that the orientation angle is 0 ° (that is, the molecular axis of the pen is larger than the substrate plane) as the orientation angle of the pen is larger than 0 °.
- the carrier mobility in the hatched area in FIGS. 10A and 10B is that the molecular axis of the pen is close to 90 ° when the orientation angle of the pen is around 90 °.
- the structure is erect on a plane and the molecular axis of the main chain of the 7T conjugated organic semiconductor molecule is improved as compared with the case where the molecular axis of the main chain of the 7T conjugated organic semiconductor molecule is perpendicular to the perpendicular of the opposite side of the source electrode and the drain electrode I got it.
- the orientation angle at which the highest carrier mobility can be obtained is calculated by using the conductivity ⁇ 1 when the orientation angle is 0 ° and the conductivity H 2 when the orientation angle is 90 ° as follows: ) Was found to be near 0 calculated by Further, as a result of further investigation on a preferred range of the orientation angle of the pen, as shown in FIGS. 10A and 10B, a range of ⁇ 5 ° centered on 0 calculated by equation (1) (however, , Excluding the portion exceeding 90 °) was found to be most suitable.
- pen-based pentacene was used as the U-conjugated organic semiconductor molecule used for the semiconductor layer. It is not limited to the material. That is, the effect of the present invention is manifested by the positional relationship between the orientation direction of the molecular axis of the ⁇ -conjugated organic semiconductor molecules constituting the semiconductor layer and the substrate plane. The same effect can be obtained even when is used.
- other oligoacenes such as tetracene having a different number of six-membered rings may be used, or an oligoacene-based derivative in which a part of those structures is substituted or chemically modified may be used. good.
- the case where a derivative of a thiophene polymer is used is described, and in the second embodiment, a case where a derivative of an acene polymer is used, as an example.
- the invention is not limited to the material, and even if an acetylene-based, pyrrole-based, or phenylene-based polymer derivative is used, the film is formed by controlling the orientation direction in accordance with the gist of the present invention. The same effect can be obtained in the case of the above. Also, when a derivative of a copolymer obtained by combining any of the above materials is used, the same effect as the effect of the present invention can be obtained. In addition, when selecting a material from these materials, if a crystalline material is selected as in the case of the pen described in the second embodiment, a higher carrier is used as compared with the case where an amorphous material is used. Mobility can be obtained.
- a material mainly composed of PED ⁇ which is an organic material, or Au is used as an electrode material of the source electrode, the drain 'electrode, and the gate electrode.
- Other conductive polymer materials can also be used, and inorganic materials such as ITO and Cu can also be used.
- ITO and Cu inorganic materials
- the gate insulating layer and the substrate are not limited to the materials used in the first and second embodiments, but it is preferable to select an elastic material like the electrode or use a material which is not easily affected by bending. I like it.
- a method for orienting the oligothiophene derivative molecules in a predetermined direction a method is provided in which a groove is formed in a substrate, and the oligothiophene derivative molecule dispersed in a solvent is applied thereon and dried.
- a method of orienting the pen in a predetermined direction a method of forming an orientation layer on a gate insulating layer serving as a base and performing vacuum deposition under predetermined conditions to form a film.
- the effect of the present invention is manifested by the positional relationship between the orientation direction of the semiconductor layer and the source electrode-drain electrode or the substrate plane, as described above. Is not a problem.
- the LB method described as the background art the stretching method, a method in which polytetrafluoroethylene is pressed onto a substrate at a constant pressure to slide and form an orientation, and an organic semiconductor is brought into contact therewith, or ⁇ -conjugated
- the same effect can be obtained by forming an oriented oligomer film of a system oligomer molecule using a method using a hot-wall-epitaxy method or the like.
- a method of chemically modifying a side chain of a ⁇ -conjugated organic semiconductor molecule with a liquid crystal substituent and controlling the alignment by utilizing the effect of the substituent may be used.
- the orientation angle considered to be optimal at each gate voltage is shown as 0, but these are not uniquely determined by the material. That is, even if the conductivity is 1 and ⁇ 2 are the same material, the conductivity may vary depending on the film formation state, the configuration of TFT, and the like. However, by determining the orientation angle in accordance with the gist of the present invention, it becomes possible to configure ⁇ F ⁇ with the highest carrier mobility in the state actually used.
- a seat-like flexible display As an application example using the TFT described in the first and second embodiments, a seat-like flexible display, a wireless ID tag, a portable television, a communication terminal, a portable medical device, and the like.
- portable equipment such as equipment.
- OLED is displayed as a seatlike flexible display.
- An example of the configuration of the active matrix type display used for the display unit is described.
- FIG. 11 is a perspective view schematically showing a configuration of an active matrix display using an organic EL according to the present embodiment for a display unit.
- the active matrix display has a TFT drive circuit 110 connected to pixel electrodes on a plastic substrate 101 in an array.
- an organic EL layer 102 and a protective film 104 are provided on the TFT drive circuit 110.
- a transparent electrode 103 is provided on the upper surface of the organic EL layer 102.
- the organic EL layer 102 is formed by laminating layers such as an electron transport layer, a light emitting layer, and a hole transport layer.
- the source electrode line 105 and the gate electrode line 106 extended from a predetermined electrode of each TFT are connected to a control circuit (not shown).
- an enlarged view of the TFT drive circuit unit 110 is shown in FIG.
- the laminated structure of the TFT itself is basically the same as the laminated structure shown in the first embodiment.
- a semiconductor layer 114, a source electrode 115, a drain electrode 116, a gate insulating layer 113, and a gate electrode 112 are laminated. Being done.
- the drain electrode 116 is electrically connected to the pixel electrode 117 of the organic EL.
- An insulating layer 118 is provided at the intersection of the gate electrode line 106 connected to the gate electrode 112 and the source electrode line 105 connected to the source electrode 115. Have been.
- the TFT portion can be manufactured by a low cost process, so that the entire display is inexpensive, and A sheet-like display excellent in mechanical flexibility and impact resistance can be realized. Also, it is possible to provide an active matrix type display having a high display speed (reaction speed).
- the effect of the present invention is not limited to the active matrix type display having this configuration. In other words, if the display is an active matrix type display that requires a TFT circuit, the same effect can be obtained.
- the structure of the driver circuit portion for driving the pixel is not limited to the structure described in this embodiment mode. That is, for example, a configuration in which a TFT for current driving for driving one pixel and a TFT for switching for controlling the TFT may be used. Further, a circuit configuration in which a plurality of TFTs are further combined can be used.
- FIG. 13 is a perspective view schematically showing a configuration of a wireless ID tag using the TFT according to the present embodiment.
- the wireless ID tag 120 uses a film-like plastic substrate 122 as a base material.
- An antenna section 122 and a memory IC section 123 are provided on the substrate 121.
- the memory IC section 123 can be configured using the TFT described in the first and second embodiments.
- the wireless ID tag 120 can be used by attaching it to an uneven surface such as a confectionery bag or a drink can by giving an adhesive effect to the back surface. Note that a protective film is provided on the surface of the wireless ID tag 120 as necessary.
- the wireless ID tag As described above, by configuring the wireless ID tag using the TFT described in the first and second embodiments, it is possible to realize a wireless ID tag that can be attached to various shapes or materials. become. In addition, it is possible to provide a wireless ID tag having a high reaction speed (processing speed).
- the effect of the present invention is not limited to the configuration of the wireless ID tag shown in FIG. Therefore, the layout of the antenna, memory and IC
- the configuration method can be set arbitrarily.
- an ethics circuit unit can be incorporated in a wireless ID tag.
- the present invention is not limited to this embodiment.
- the present invention is not limited to this embodiment.
- a high-performance wireless ID tag having excellent mechanical flexibility and impact resistance can be manufactured at low cost.
- FIGS. 14 to 16 show some specific applications of the portable device using the TFT according to the present invention.
- FIG. 14 is a front view schematically showing a configuration of a portable television using the TFT according to the present embodiment.
- the portable television set 130 includes a display section 131 composed of a liquid crystal display device or the like for displaying a television image, and a stretchable rod antenna here. Adjustment of the volume of the audio output output from the receiving unit 13 2 that can receive the broadcast radio wave, the power switch 13 that controls the ON / OFF of the portable TV 13 0, and the audio output device 13 5 described later An operation switch 134 for switching the channel of the television broadcast to be received, an audio output unit 135 including a speaker or the like for outputting television audio, and an audio signal or a video signal input or output to the portable television 130. Input / output terminal 13 6 output from portable TV 13 0, and recording media insertion section 1 3 7 for inserting recording media for recording audio and video signals related to received TV broadcasts as needed And
- the portable television 130 is internally provided. It has integrated circuits such as ICs and LSIs. Then, an integrated circuit using the TFT according to the present invention is appropriately used as an arithmetic element, a storage element, a switching element, and the like that constitute the portable television set 130. Thereby, the portable television set 130 functions as a portable television broadcast receiver.
- a mobile phone is exemplified as the communication terminal.
- FIG. 15 is a front view schematically showing a configuration of a mobile phone using the TFT according to the present embodiment.
- the mobile phone 140 includes a display section 141 including a liquid crystal display device or the like for displaying a telephone number and the like, and a whip antenna which can be stored here.
- a transmitting / receiving unit 144 capable of transmitting and receiving communication radio waves, a sound output unit 144 including a speaker or the like for outputting communication voice, a camera unit 144 having a CCD element or the like capable of photographing, a mobile phone 1 Speech input consisting of a movable part for folding 14 to fold 40 as needed, multiple operation switches for inputting telephone numbers and characters, and a condenser microphone for inputting communication voice Part 1 4 7 is provided.
- the mobile phone 140 has an integrated circuit such as IC or LSI therein. Then, the integrated circuit using the TFT according to the present invention is appropriately used as an arithmetic element, a storage element, a switching element, and the like that constitute the mobile phone 140. Thereby, the mobile phone 140 functions as a mobile communication terminal.
- FIG. 16 is a perspective view schematically showing a configuration of a portable medical device using the TFT according to the present embodiment.
- a portable medical device that automatically performs a medical treatment such as drug administration on a patient based on the acquired biological information is illustrated.
- a patient's arm 155 which will be described later, is perspectively represented.
- the portable medical device 150 according to the present embodiment includes a display unit 151, including a liquid crystal display device or the like that displays the operating state of the device, acquired biological information, and the like.
- An operation switch 152 for performing settings related to the operation of the portable medical device 150, and biological information acquired by a transcutaneous contact unit 154, which will be described later, are processed.
- a medical treatment unit 153 that performs medical treatment such as drug administration to the patient via the transdermal contact unit 154, and sequentially collects the patient's biological information for medical treatment And a transcutaneous contact unit 154 for substantially performing medical treatment on the patient.
- the portable medical device 150 When the portable medical device 150 is used to perform a medical treatment on a patient, the portable medical device 150 is carried around the patient's arm 150 as shown in FIG. 16, for example. Is done. In the mounted state shown in FIG. 16, the percutaneous contact portion 154 and the surface of the patient's arm 155 are in close contact with each other. Then, in the mounted state shown in FIG. 16, the portable medical device 150 acquires biological information for medical treatment from the arm 150 via the percutaneous contact unit 154. When the patient's biological information is acquired, the acquired biological information is input to the medical treatment unit 153. In the medical treatment section 153, predetermined processing for medical treatment of the acquired biological information is performed. Then, based on the result of the processing, the medical treatment section 153 performs medical treatment such as drug administration to the patient via the transdermal contact section 154.
- the portable medical device 150 has an integrated circuit such as an IC or an LSI therein.
- An integrated circuit using the TFT according to the present invention is appropriately used as an arithmetic element, a storage element, a switching element, and the like that constitute the portable medical device 150. Thereby, the portable medical device 150 functions as a portable medical device.
- the following effects can be obtained. It is. That is, as an integrated circuit used in the above-described portable device, various devices using semiconductor characteristics such as an arithmetic element, a storage element, and a switching element can be considered, but in the portable device, mechanical flexibility, When the performances listed as advantages of organic materials such as impact resistance, environmental resistance at the time of disposal, light weight, low cost, etc. are required, a part of them should be configured using the TFT according to the present invention. As a result, a high-performance device can be realized at low cost. As a result, a portable device having the above-mentioned advantages can be manufactured at low cost.
- the portable devices to which the TFT according to the present invention are not limited to the above-described configurations.
- the portable device to which the TFT according to the present invention can be applied is not limited to the above-described device.
- PDA terminals, wearable audio-visual equipment, portable conveniences—evening, wristwatch-type communication equipment, etc., that require mechanical flexibility, impact resistance, environmental friendliness when discarded, light weight, low cost, etc. It is possible to preferably apply the TFT according to the present invention to equipment for use.
- FIGS. 1B and 1C show that the present invention is applied to the TFT having the configuration shown in FIGS. 1B and 1C.
- the present invention is similarly applied to the TFT having the configuration shown in FIGS. 1A and 1D.
- FIG. 1A shows that a gate electrode 12, a gate insulating layer 13, and a semiconductor layer 14 are stacked on a substrate 11, and a source electrode 15 and a drain electrode are formed on the semiconductor layer 14. 16 are stacked and configured.
- FIG. 1D shows that a source electrode 15, a drain electrode 16, a semiconductor layer 14, and a gate insulating layer 13 are stacked on a substrate 11, and a gate is formed on the gate insulating layer 13. Electrodes 12 are stacked and configured.
- the case where the source electrode and the drain electrode have a rectangular shape has been described, but the source electrode and the drain electrode are formed so as to have sides facing each other in plan view. If so, the present invention can be suitably applied. Source and drain electrodes are optional The present invention can be applied to the case where the orientation is such that the molecular axis of the main chain of the ⁇ -conjugated organic semiconductor is inclined with respect to the direction of the electric field in the channel formed in the semiconductor layer. Can be.
- the configuration of the thin film transistor having the source electrode and the drain electrode which are separately provided so as to have sides facing each other in a plan view is described.
- the ⁇ -conjugated organic semiconductor molecule has a substantially ⁇ orbital.
- the molecular axis of the main chain may be inclined with respect to the direction perpendicular to the opposite side.
- the present invention has the above-described configuration, and provides a TF ⁇ ⁇ having improved carrier mobility formed by orienting ⁇ -conjugated organic semiconductor molecules in a predetermined direction, and a method for producing the same.
- An active matrix display in which a plurality of TFTs having improved carrier mobility are arranged, a radio ID tag using the TFT having improved carrier mobility in an integrated circuit section, and a carrier movement. It is possible to provide a portable device or the like using the TFT with an improved degree for the integrated circuit section.
- the TFT according to the present invention and a method for manufacturing the same are useful as a TFT having improved carrier mobility constituted by forming 7T conjugated organic semiconductor molecules in a predetermined direction and a method for manufacturing the TFT.
- the TF according to the present invention The T is useful for manufacturing seat-like or paper-like active matrix displays, wireless ID displays, and portable equipment such as mobile TVs and mobile phones.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Thin Film Transistor (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/578,887 US7465955B2 (en) | 2003-11-11 | 2004-07-22 | Thin-film transistor and method of fabricating same |
EP04748024A EP1684360A4 (en) | 2003-11-11 | 2004-07-22 | THIN FILM TRANSISTOR AND METHOD OF MANUFACTURE |
JP2005515233A JP4365825B2 (ja) | 2003-11-11 | 2004-07-22 | 薄膜トランジスタ及びその製造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-381294 | 2003-11-11 | ||
JP2003381294 | 2003-11-11 |
Publications (1)
Publication Number | Publication Date |
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WO2005045939A1 true WO2005045939A1 (ja) | 2005-05-19 |
Family
ID=34567275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/010759 WO2005045939A1 (ja) | 2003-11-11 | 2004-07-22 | 薄膜トランジスタ及びその製造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7465955B2 (ja) |
EP (1) | EP1684360A4 (ja) |
JP (1) | JP4365825B2 (ja) |
KR (1) | KR100783851B1 (ja) |
CN (1) | CN100487919C (ja) |
WO (1) | WO2005045939A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009231313A (ja) * | 2008-03-19 | 2009-10-08 | Sumitomo Chemical Co Ltd | 電子素子 |
US8071422B2 (en) | 2005-12-20 | 2011-12-06 | Lg Display Co., Ltd. | Method of fabricating thin film transistor including organic semiconductor layer and substrate |
WO2012124666A1 (ja) * | 2011-03-14 | 2012-09-20 | 帝人株式会社 | 薄膜トランジスタ及びその製造方法 |
WO2013008880A1 (ja) * | 2011-07-12 | 2013-01-17 | 大日本印刷株式会社 | 有機半導体素子の製造方法および有機半導体素子 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2450381B (en) * | 2007-06-22 | 2009-11-11 | Cambridge Display Tech Ltd | Organic thin film transistors |
GB2469507B (en) | 2009-04-16 | 2011-05-04 | Cambridge Display Tech Ltd | Organic thin film transistors |
KR102343656B1 (ko) | 2015-01-15 | 2021-12-27 | 삼성디스플레이 주식회사 | 유기 발광 표시 장치 |
CN112117333A (zh) * | 2020-09-24 | 2020-12-22 | 京东方科技集团股份有限公司 | 一种薄膜晶体管及其制备方法、显示基板、显示装置 |
CN114388559A (zh) * | 2020-10-20 | 2022-04-22 | 华为技术有限公司 | 显示面板、显示面板的制作方法及电子设备 |
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2004
- 2004-07-22 WO PCT/JP2004/010759 patent/WO2005045939A1/ja active Application Filing
- 2004-07-22 US US10/578,887 patent/US7465955B2/en active Active
- 2004-07-22 KR KR1020067009069A patent/KR100783851B1/ko active IP Right Grant
- 2004-07-22 JP JP2005515233A patent/JP4365825B2/ja not_active Expired - Fee Related
- 2004-07-22 EP EP04748024A patent/EP1684360A4/en not_active Withdrawn
- 2004-07-22 CN CNB2004800332001A patent/CN100487919C/zh not_active Expired - Fee Related
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WO2012124666A1 (ja) * | 2011-03-14 | 2012-09-20 | 帝人株式会社 | 薄膜トランジスタ及びその製造方法 |
WO2013008880A1 (ja) * | 2011-07-12 | 2013-01-17 | 大日本印刷株式会社 | 有機半導体素子の製造方法および有機半導体素子 |
Also Published As
Publication number | Publication date |
---|---|
US7465955B2 (en) | 2008-12-16 |
EP1684360A4 (en) | 2009-09-23 |
KR100783851B1 (ko) | 2007-12-10 |
JPWO2005045939A1 (ja) | 2007-05-24 |
CN1879223A (zh) | 2006-12-13 |
EP1684360A1 (en) | 2006-07-26 |
CN100487919C (zh) | 2009-05-13 |
JP4365825B2 (ja) | 2009-11-18 |
US20070158641A1 (en) | 2007-07-12 |
KR20060089242A (ko) | 2006-08-08 |
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