WO2005022660A1 - 有機半導体膜、それを用いた電子デバイス、およびそれらの製造方法 - Google Patents
有機半導体膜、それを用いた電子デバイス、およびそれらの製造方法 Download PDFInfo
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- WO2005022660A1 WO2005022660A1 PCT/JP2004/012581 JP2004012581W WO2005022660A1 WO 2005022660 A1 WO2005022660 A1 WO 2005022660A1 JP 2004012581 W JP2004012581 W JP 2004012581W WO 2005022660 A1 WO2005022660 A1 WO 2005022660A1
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- semiconductor film
- organic semiconductor
- organic
- polymer compound
- conductive polymer
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Classifications
-
- 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]
- H10K10/466—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
Definitions
- the present invention relates to an organic semiconductor film, an electronic device using the same, and a method for manufacturing the same.
- organic material as a material for forming a semiconductor layer (semiconductor film), in particular, a thin film transistor (TFT) have been proposed, and research and development thereof have been actively conducted.
- TFT thin film transistor
- the advantages of using organic materials for the semiconductor layer are various.
- conventional inorganic thin film transistors based on inorganic amorphous silicon, etc. require a heating process at about 350-400 ° C
- organic TFTs can be manufactured using a low-temperature heating process at about 50-200 ° C. It is.
- Another advantage of an organic material is that a semiconductor layer can be formed using an easy forming method such as spin coating, an ink-jet method, printing, or the like, and a large-area device can be manufactured at low cost.
- One of the indices used to determine the performance of a TFT is the carrier mobility of the semiconductor layer.
- Many studies have been made to improve the carrier mobility of the organic semiconductor layer (organic semiconductor film) in organic TFTs. Have been.
- studies focusing on the molecules of the organic material forming the organic semiconductor layer (organic semiconductor film) include, for example, studies using poly (3-alkylthiophene) (Patent Document 1) Etc.).
- Patent Document 1 Etc. studies focused on the structure of organic TFTs includes, for example, improving the crystal orientation of the organic semiconductor layer by interposing an alignment film between the gate insulating layer and the organic semiconductor layer.
- Patent Document 2 proposes to improve carrier mobility
- Patent Document 1 Japanese Patent Application Laid-Open No. H10-10-9000 1
- Patent Document 2 Japanese Patent Application Laid-Open No. 9 _ 23 2 58 9
- an object of the present invention is to provide an organic semiconductor film that can be used for, for example, an electronic device and the like, and in particular, can obtain a high-performance TFT by using it for an organic TFT, and a method of manufacturing the same.
- the organic semiconductor film of the present invention is formed of an organic conductive high molecular compound, and has a wavelength range of 300 to 800 nm when measured by a solid visible / ultraviolet absorption spectrum method. It is an organic semiconductor film showing two or more spectral peaks.
- the organic semiconductor film of the present invention can be used for, for example, an electronic device and the like, and in particular, has a high performance when used for an organic TFT.
- FIG. 1 is a schematic diagram of organic TFTs of an example and a comparative example.
- FIG. 2 is a visible / ultraviolet absorption spectrum diagram of P 3 HT used in Example 1 and Comparative Example in a solution state.
- FIG. 3 is a visible / ultraviolet absorption spectrum diagram of the organic semiconductor films of Example 1 and Comparative Example.
- FIG. 4 is a graph showing carrier mobilities of the organic semiconductor films of Example 1 and Comparative Example.
- FIG. 5 is a schematic diagram showing a mechanism for estimating a change in visible / ultraviolet absorption spectrum of an organic conductive polymer compound solution.
- FIG. 6 is a schematic diagram showing a mechanism for estimating the relationship between a change in the visible / ultraviolet absorption spectrum of the organic conductive polymer compound solution and a change in the carrier mobility of the organic semiconductor film.
- FIG. 7 is a schematic diagram showing a mechanism for estimating the relationship between the molecular weight distribution width of the organic conductive polymer compound and the carrier mobility.
- FIG. 8 is a graph showing the carrier mobilities of the organic semiconductor films of Examples 1 and 2 and Comparative Example.
- FIG. 9 is a graph showing an XRD spectrum diagram of the organic semiconductor film for the organic TFTs of Examples 1 and 2.
- FIG. 10 is a cross-sectional view schematically showing an example of a presumed structure of a part of the organic TFT. BEST MODE FOR CARRYING OUT THE INVENTION
- an organic semiconductor film formed of an organic conductive polymer compound has two visible / ultraviolet absorption spectra (also referred to as an ultraviolet / visible absorption spectrum or UV / VIS spectrum) as described above. It has been found that when the above spectrum peak is shown, characteristics such as carrier mobility are improved as compared with the case where only one spectrum peak is shown.
- the mechanism of the correlation between the visible / ultraviolet absorption spectrum and the carrier mobility is unknown, but, for example, as described below, it is related to the arrangement of the organic conductive polymer compound molecules in the organic semiconductor film. It is thought that there is.
- the present invention has made it possible to obtain an organic semiconductor film having a further improved carrier mobility than before.
- the “solid-state visible / ultraviolet absorption spectrum method” for the organic semiconductor film means “visible as a solid (solid state) without performing an operation such as dissolving the organic semiconductor film in a solvent.
- a method for measuring the ultraviolet absorption spectrum More specifically, the organic semiconductor film is formed by forming the same thin film as the organic semiconductor film on a glass substrate (thickness: 1.0 mm), and using an ultraviolet / visible spectrophotometer (trade name, manufactured by JASCO Corporation) : Using a UV-Visible near-infrared spectrophotometer V-570), at room temperature and normal pressure, in the wavelength range from ultraviolet to visible light (300 to 800 nm), a reference (organic semiconductor film is formed) at wavelength l nm intervals.
- the thickness of the thin film is not particularly limited since it does not affect the number of vector peaks, but is, for example, 100 to 200 nm.
- the intensity and wavelength of the two or more spectral peaks in the organic semiconductor film of the present invention are not particularly limited, for example, the intensity of the shortest wavelength side peak is larger than the intensity of any other peak.
- the peak at the longest wavelength side is present in the wavelength region of 550 to 800 nm, for example, the peak at the shortest wavelength side is preferably 350 to 800 nm.
- the organic conductive polymer compound is preferably polythiophene represented by the following formula (I), for example, from the viewpoint of higher carrier mobility and the like.
- R is a hydrogen atom or an arbitrary substituent, and is not particularly limited, but is preferably a substituent which does not inhibit required characteristics as an organic semiconductor.
- n is the degree of polymerization.
- R is more preferably at least one selected from the group consisting of a hydrogen atom, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted carbon ring, wherein the alkyl group is It is a straight-chain or branched alkyl group having 1 to 12 carbon atoms.
- the carbocycle is a saturated or unsaturated carbocycle having 3 to 20 ring carbon atoms, and more preferably a monocyclic or condensed ring.
- the alkyl group is, for example, at least one selected from the group consisting of a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, an octyl group, a decyl group, and a dodecyl group. May be linear or branched.
- the alkyl group is particularly preferably a linear or branched alkyl group having 6 or more carbon atoms, for example, at least one selected from the group consisting of a hexyl group, an octyl group, a decyl group, and a dodecyl group. Yes, they may be linear or branched.
- the expression that the alkyl group according to the above examples may be “linear or branched” means, for example, that the “propyl group” includes both an n-propyl group and an isopropyl group, and that the “butyl group”
- group is meant to include n-butyl, sec-butyl, isobutyl and tert-butyl.
- the carbocycle is more preferably a benzene ring (phenyl group).
- the alkyl group and the substituent on the carbon ring are more preferably at least one selected from the group consisting of a halogen, a hydroxy group, a mercapto group, a carboxy group, and a sulfo group.
- R when R is, for example, an n-hexyl group, an organic semiconductor film having particularly good characteristics can be obtained.
- a suitable polythiophene is not limited thereto, and various types are possible.
- the polythiophene in which R is an n-hexyl group is referred to as poly (3-hexylthiophene) or P 3 HT.
- the degree of polymerization n is not particularly limited, but is preferably, for example, an integer of 50 to 1,200.
- the molecular weight is preferably 10,000 to 200,000, and when R is a hexyl group, the polymerization degree is 55 to 1200, and when R is a dodecyl group, Has a polymerization degree of 50 to 1,050.
- the organic conductive polymer It is more preferable that the molecular weight distribution width MwZMn obtained by dividing the weight average molecular weight Mw of the compound by the number average molecular weight Mn is in the range of 1.00 to 1.85, because the characteristics of the organic semiconductor film are further improved.
- the lower limit of the molecular weight distribution width MwZMn is not particularly limited. Ideally, the lower limit is closer to 1, but is, for example, 1.51 or more. Further, for example, it is more preferable that the weight average molecular weight Mw of the organic conductive polymer compound is in the range of 41,000 to 55,000, and the number average molecular weight Mn is 27,150 or more. In this case, the upper limit of the number average molecular weight Mn is not particularly limited, but is a numerical value not exceeding the value of the weight average molecular weight Mw, for example, 33,200 or less.
- the organic conductive polymer compound has a number average molecular weight Mn and a weight average molecular weight Mw of 0.05 to 1.0% by weight (for example, 0.08% by weight).
- the value obtained is the value obtained when the polymer compound solution is subjected to gel permeation chromatography (GPC) using a model 300 TDA-Triple mode (trade name) manufactured by Viscotek.
- the mobile phase solvent is chloroform or THF
- the column is TSKgel GMH XL (using two 30 cm (length) X7.8 inm id (inner diameter))
- the temperature is 40 ° C (both column and detector)
- the concentration of the organic conductive polymer compound solution is 0.08% by weight (when the solvent is THF, the solvent (THF) is 1 mL (0.8892 g) and the organic conductive polymer is The compound can be measured at an injection amount of 100 zL and a flow rate of 1. OmL / min.
- the carrier mobility of the organic semiconductor film of the present invention for example, l (T 4 cm 2 / V -.
- the upper limit of the mobility is not particularly limited, and the higher the better, the better, for example, is lO ⁇ cmVV ⁇ s or less. It can be measured by the method described in the above-described embodiment.
- the organic semiconductor film of the present invention in an X-ray diffraction (XRD) spectrum diagram, two points where a part where a peak exists and a part where it does not exist are connected by a straight line, and the diffraction X-ray relative intensity at the peak apex is obtained.
- the i if Oite scattering angle 2 S to the straight line has a diffraction X-ray relative intensity of points equal to the peak apex and i 0, i / i. Is preferably 1.6 or more.
- a large value indicates that the organic conductive polymer compound molecules in the organic semiconductor film are regularly arranged, and thus is considered preferable from the viewpoint of improving carrier mobility.
- the i / i. Is the value measured using an automatic X-ray diffractometer called RINT-TF-PC (trade name) of Rigaku Corporation. Said i / i. Is more preferably 1.8 or more, and the i / i.
- the upper limit of the value is not particularly limited, it is, for example, 3.6 or less.
- the electronic device of the present invention has high performance by including the organic semiconductor film of the present invention, and its use is not particularly limited, but is preferably used, for example, as a thin film transistor (TFT). Further, the electronic device of the present invention is not particularly limited except that it includes the organic semiconductor film of the present invention, and its structure and the like are arbitrary.
- the same structure as that of the related art can be appropriately used.
- a structure in which the organic semiconductor film is formed on an insulating layer is possible. In that case, a contact angle of water on a surface of the insulating layer in contact with the organic semiconductor film is reduced. It is preferable that the angle is 13 ° or less.
- the small contact angle indicates that the wettability with respect to water and other liquids is large, and is considered preferable from the viewpoint of improving the adhesion to the organic semiconductor film, and further improving the carrier mobility.
- the lower limit is not particularly limited, but is, for example, 0.1 ° or more.
- the contact The antennal value shall be the value measured using Elma Sales Co., Ltd. model G-1 (trade name). Next, a method for manufacturing an organic semiconductor film of the present invention will be described.
- the characteristics such as carrier mobility in the organic semiconductor film of the organic TFT many relationships with the organic semiconductor material and the organic TFT structure have been examined as described above, but the relationship with the formation process is too specific. No proposal had been made. Therefore, by clarifying the relationship between carrier mobility and the organic semiconductor film formation process, it is possible to achieve higher carrier mobility by combining it with an effective organic semiconductor material, and to obtain stable carrier mobility. It has been desired to realize a forming process for this. Therefore, the present inventors have conducted intensive studies and as a result, have found a production method of the present invention described below. Although the manufacturing method of the present invention may be used for manufacturing any kind of organic semiconductor film, it is suitable for manufacturing the organic semiconductor film of the present invention.
- the method for manufacturing the organic semiconductor film of the present invention is not particularly limited, and may be manufactured by any method, but is preferably manufactured by the manufacturing method of the present invention described below.
- the first production method of the present invention is a method for producing an organic semiconductor film, which contains an organic conductive polymer compound, and is 300 to 800 when measured by a visible / ultraviolet absorption spectrum method. It is characterized by comprising a step of forming a solution exhibiting two or more spectral peaks in a wavelength region of nm into a thin film, and a step of drying the solution formed in the thin film.
- the organic conductive polymer compound is preferably, for example, polythiophene represented by the formula (I).
- an ultraviolet-visible spectrophotometer manufactured by JASCO Corporation, trade name: ultraviolet-visible near-infrared spectrophotometer V-570
- a glass cell optical path length 1.0 cm
- the solvent used in the production of the organic semiconductor film was used, and the concentration was 0.01% by weight.
- a reference solution an organic conductive polymer compound was used without containing an organic conductive polymer compound
- the same solution as the above-mentioned solution except that it consists only of a solvent) is used at the same time, and the measurement is carried out at room temperature and normal pressure in the wavelength range from ultraviolet to visible light (300 to 800 nm) at a wavelength of 1 M1.
- these measurement conditions are merely an example of the measurement conditions for judging the suitability of the organic conductive polymer compound solution
- the first production method of the present invention is a method of producing using the measurement conditions. It is not limited to.
- FIGS. 5 and 6 show schematic diagrams of the above mechanism, but these diagrams merely show an example of the presumed mechanism, and do not limit the present invention in any way.
- 5A and 5B are schematic diagrams showing states of molecules in the organic conductive polymer compound solution
- FIG. 5C is a schematic diagram showing states of aggregation of the molecules.
- FIGS. 6A and 6B are schematic diagrams showing what happens to the state of the molecules when an organic semiconductor film is formed using the solution shown in FIGS. 5A and 5B.
- 7 is an organic conductive polymer compound molecule
- 8 is a solution in which it is dissolved
- 3 is an organic semiconductor film formed by the molecule 7.
- the organic semiconductor film formed using the solution also has an irregular arrangement of the organic conductive polymer compound molecule. It is thought that it becomes. If electrons move easily between main chains (between molecules), the spectral peak generally tends to shift slightly to longer wavelengths, but this is not absolute.
- the intensity and wavelength of the two or more spectral peaks are not particularly limited.
- the intensity of the shortest wavelength side peak is larger than the intensity of any other peak or It is preferable that the peaks at the longest wavelength are in the wavelength range of 550 to 800 nm.
- the shortest wavelength side peak is present in the wavelength region of 300 to 500 nm, and at least one of the other peaks is the shortest wavelength side peak.
- the wavelength is preferably 100 nm or more longer than the wavelength.
- the interaction between the organic conductive polymer compound molecules is different from that in the solid state, and there is also the interaction between the organic conductive polymer compound molecules and the solvent molecules.
- the wavelength is slightly different from the solid state.
- a second production method of the present invention is a method for forming an organic semiconductor film, comprising: a step of forming a solution containing an organic conductive polymer compound into a thin film; and a step of drying the solution formed in the thin film.
- the method for producing, wherein the organic conductive polymer compound has a molecular weight distribution width Mw / Mn obtained by dividing a weight average molecular weight Mw by a number average molecular weight Mn in a range of 1.00 to 1.85. I do.
- the organic conductive polymer compound is preferably, for example, polythiophene represented by the above formula (I).
- the definitions of R and n are as described above, and preferred examples of R and the preferred range of n are also as described above.
- the lower limit of the molecular weight distribution width MwZMn is not particularly limited, and ideally, the closer to 1, the better, but for example, 1.51 or more. Further, for example, it is more preferable that the organic conductive polymer compound has a weight average molecular weight Mw of 41,000 to 550000, and a number average molecular weight Mn of 27,150 or more. .
- the upper limit of the number average molecular weight Mn is not particularly limited, but is a value not exceeding the value of the weight average molecular weight Mw, for example, 33,200 or less.
- the organic conductive polymer compound when Mw / Mn is 1.00 ⁇ 1.85 under the measurement conditions shown in the examples described below, the conditions that can be used in the second production method of the present invention Shall be satisfied.
- this measurement condition was determined for the organic conductive polymer compound. This is merely an example of measurement conditions for judging suitability, and the second production method of the present invention is not limited to a method of producing using these measurement conditions.
- FIGS. 7A and 7B are schematic diagrams showing the arrangement of molecules in a solution of organic conductive polymer compound molecules when the molecular weight distribution width is large and small, respectively.
- the organic conductive polymer compound molecules are difficult to be regularly arranged in a solution if the variation in the size of the molecule is large, whereas if the variation is small, the main chain is as shown in Fig.
- the method for adjusting the molecular weight and the molecular weight distribution width of the organic conductive polymer compound is not particularly limited, and examples thereof include the following methods.
- the so-called centrifugal separation method that is, when a centrifugal force is applied to a substance having a different molecular weight by rotation, the property that the higher the molecular weight is distributed to the outside is used, and the one having a desired molecular weight and the other having an inappropriate molecular weight are used.
- centrifugal separation method that is, when a centrifugal force is applied to a substance having a different molecular weight by rotation, the property that the higher the molecular weight is distributed to the outside is used, and the one having a desired molecular weight and the other having an inappropriate molecular weight are used.
- a chromatography method that is, a method of separating a large molecule from a small molecule by subjecting a solution of the organic conductive polymer compound to gel permeation chromatography (GPC) or the like.
- the reprecipitation method that is, first, the organic conductive polymer compound is dissolved in a minimum amount of a solvent (good solvent).
- a purification method in which the resulting solution is dropped into a solvent (poor solvent) having low solubility in the organic conductive polymer compound to cause precipitation to occur.
- the method for optimizing the molecular weight and the molecular weight distribution width is not limited to these, and any other method may be used, and good results can be obtained by using a commercially available organic conductive polymer compound as it is. If it can be used, it may be used without any processing.
- the organic conductive polymer compound solution in order to obtain higher carrier mobility, is preferably allowed to stand before being formed into a thin film, It is more preferable to allow the sample to stand still. At this time, the standing time is not particularly limited, but is preferably 10 minutes or more, and the upper limit thereof is not particularly limited, but is, for example, 60 minutes or less.
- the mechanism by which the carrier mobility is further improved by such a method is not clear, but the organic conductive polymer compound molecules are regularly oriented by allowing the solution to stand, and thus the molecular orientation state of the organic semiconductor film is also improved. It will be regular and it will be reflected in carrier mobility. The gelation during the standing of the solution may be due to the regular orientation of the organic conductive polymer molecules to form microcrystals. Even if the organic conductive polymer compound solution is not left standing until it gels, the effect of improving carrier mobility can be obtained.However, since the change in the state of the solution can be easily confirmed visually, the solution is left standing until it gels. Is preferred. In addition, since it is difficult to process the organic conductive polymer compound solution while it is gelled, it is more preferable to return to a liquid state by reheating before forming a thin film.
- the solvent of the organic conductive polymer compound solution is not particularly limited, but the organic conductive polymer compound From the viewpoint of the solubility of the product, for example, it is preferable to include at least one of an aromatic hydrocarbon, a halogenated aromatic hydrocarbon, an aliphatic hydrocarbon, and an octogenated aliphatic hydrocarbon, Toluene, 0-xylene
- the method further includes a step of preparing an insulator, and a step of plasma-etching the insulator surface. It is preferable to form the solution containing the organic conductive polymer compound into a thin film from the viewpoint of further improving the carrier mobility of the organic semiconductor film.
- the insulator is not particularly limited, absolute ⁇ included in the electronic device, for example, a gate insulating layer or the like of a thin film transistor (TFT) may be, but not particularly limited thereof forming materials, for example, S i0 2 , S iO x, S iN x , A1N X, polyimide, polyester, polymethyl methacrylate, and the like.
- TFT thin film transistor
- FIG. 10 is a sectional view schematically showing an estimated structure of a part of an organic TFT using the organic semiconductor film.
- FIG. 10A shows a case where the gate insulating layer was not subjected to the plasma etching treatment
- FIG. 10B shows a case where the gate insulating layer was subjected to the plasma etching treatment.
- these organic TFTs are A gate insulating layer 2 is laminated on the gate electrode 4, and an organic semiconductor film 3 is further laminated thereon. Further, in FIG. 10B, the adhesion between the gate insulating layer 2 and the organic semiconductor film 3 is further improved as compared with FIG. 10A.
- the mechanism is presumed to be due to the fact that the wettability of the gate insulating layer 2 is further improved by plasma etching the surface of the gate insulating layer 2. That is, since the wettability of the surface is further improved, it becomes more compatible with the organic conductive polymer compound solution, and the solution is formed into a thin film, and adheres to the organic semiconductor film 3 obtained by drying. It is thought that the property will be further improved. Further, by further improving the adhesion, the area where the gate insulating layer 2 and the organic semiconductor film 3 are substantially in contact with each other is further increased. As a result, it is presumed that the loss when the gate voltage is applied to the organic semiconductor film 3 is reduced, leading to a further improvement in the carrier mobility.
- the following is also presumed as another factor that further improves the carrier mobility. That is, when the wettability of the surface of the gate insulating layer 2 is further improved as described above, the surface structure of the surface of the organic semiconductor film 3 in contact with the gate insulating layer 2 becomes more uniform, and the molecular arrangement of the organic conductive polymer compound is increased. It is possible that the columns will be more regular. Then, in the organic semiconductor film 3, the regularity of the molecular arrangement, for example, the crystal orientation (the degree of the main chain stack) is improved, so that it is estimated that the carrier mobility is further improved.
- the mechanism for estimating that carrier mobility is considered to be improved by regularly arranging the organic conductive polymer compound molecules is as described above.
- the manufacturing method of the present invention when the insulator surface is subjected to plasma etching, a synergistic effect with adjusting the MwZMn of the organic conductive polymer compound or the visible / ultraviolet absorption spectrum of the solution is obtained. Can be considered. Specifically, the organic semiconductor polymer molecules are particularly easily arranged regularly by the synergistic effect. It is speculated that the carrier mobility of the conductor film may be further improved.
- the conditions of the plasma etching process are not particularly limited.
- the distance between the surface and the electrode, the ion current, and the like are considered in consideration of an etching rate, an etching degree (degree of hitting) of the surface to be etched, and the like. It is preferable to appropriately set the size, processing time, and the like.
- the gas used for the plasma etching treatment is not particularly limited, but examples include oxygen, argon, and the like.
- the plasma etching is preferably performed in an atmosphere containing oxygen gas, from the viewpoints of further improving etching efficiency, reducing damage to the insulator surface by etching, and carrier mobility of the organic semiconductor film. preferable.
- the relationship between the damage given to the insulator surface by etching and the carrier mobility of the organic semiconductor film can be considered, for example, as follows. That is, if the degree of etching of the insulator surface is too large (too striking), the insulator surface is roughened, so that the molecules of the organic conductive polymer compound are difficult to be regularly arranged. Carrier mobility may not be improved. It is presumed that the use of oxygen gas makes it easy to obtain a particularly appropriate etching degree, which leads to prevention of the insulator surface roughness, and in particular that the carrier mobility of the organic semiconductor film is improved. However, this description is also merely an example of the presumed mechanism, and does not limit the present invention in any way.
- a method of forming the solution into a thin film is not particularly limited.
- a spin coating method, a casting method, a printing method such as screen printing or gravure printing Conventional methods such as an ink jet printing method can be appropriately used.
- the drying method is also limited.
- natural drying may be used, but heat drying or vacuum drying is preferable from the viewpoint of production efficiency, and heating and vacuum treatment may be performed simultaneously to dry.
- the temperature, pressure, and the like during drying are not particularly limited, and, for example, the same conditions as in the conventional organic semiconductor film production may be appropriately applied.
- a method for manufacturing an electronic device according to the present invention is a method for manufacturing an electronic device including an organic semiconductor film, wherein the organic semiconductor film is manufactured by the first or second manufacturing method according to the present invention.
- a high-performance electronic device can be manufactured by this method.
- the method for manufacturing an electronic device of the present invention is not particularly limited, and for example, a method similar to a conventional method for manufacturing an electronic device can be appropriately applied.
- the electronic device is not particularly limited, but is preferably, for example, a thin film transistor (TFT).
- a plurality of organic TFTs were manufactured, the correlation between applied voltage and current was examined, and the carrier mobilities were calculated and compared.
- Each organic TFT was manufactured by changing the organic semiconductor film, but all other portions were manufactured using the same material and had the same configuration. Specifically, the organic semiconductor films were all manufactured using P 3 H T (poly (3-hexylthiophene)), but were manufactured by changing the molecular weight distribution width of P 3 H T and the like.
- the visible / ultraviolet absorption spectrum of the P 3 HT solution and the organic semiconductor film produced using the same were measured with an ultraviolet / visible spectrophotometer (trade name, manufactured by JASCO Corporation, trade name: ultraviolet-visible near-infrared spectrophotometer V-5). Measured in the wavelength range of ultraviolet to visible light (300 to 800 nm) at room temperature and normal pressure at wavelength lnm intervals using 70) did. At the time of measurement of the solution, the measurement was performed using a glass cell (optical path length: 1.0 cm) and a reference solution (the same solution as the above solution except that it did not contain P3HT and consisted only of an organic solvent).
- the solvent used was the same as that used in the production of organic TFT, and the concentration of the solution was 0.01% by weight.
- an organic semiconductor film formed on a glass substrate (thickness: 1.0 mm) with a film thickness of 100 to 200 nm is used as a reference (the glass substrate on which no organic semiconductor film is formed). It was measured together.
- the molecular weight of P3HT is 0.05-1.0 wt% concentration?
- the concentration of the sample solution was 0.05 to 1.0% by weight as described above.
- the measurement was made with 0.69 mg (0.08% by weight) of the organic conductive polymer compound per 1 mL (0.8892 g) of the solvent (THF).
- the mobile phase solvent is chromatoform or THF
- the column is TSKgel GMHXL (using two 30cm (length) X7.8IMI id (inner diameter))
- the temperature is 40 ° C (both column and detector)
- sample The solution injection volume was 100 ⁇ L and the flow rate was 1. OmL / min.
- P 3HT is manufactured by Sigma-Aldrich
- Regioregular was purchased and used by appropriately adjusting the molecular weight and the molecular weight distribution width by the centrifugation method, the chromatography method and the reprecipitation method.
- the “regioregular” is a product specification of Sigma-Aldrich, and means that in P 3 HT, the positional regularity of the hexyl group is high.
- FIG. 1 shows the structure of the organic TFT manufactured in this example. As mentioned above, a plurality of organic TFTs were manufactured, but all have the same structure. FIG. 1A is a side view of these organic TFTs, and FIG. 1B is a top view. Hereinafter, the structure of the organic TFT will be described with reference to FIG.
- the organic TFT has a substrate 1, a gate insulating layer 2, an organic semiconductor film (organic semiconductor layer) 3, a gate electrode 4, a drain electrode 5, and a source electrode 6 as main components.
- a gate electrode 4 is laminated on the upper surface of the substrate 1, a gate insulating layer 2 is laminated on a part of the upper surface of the gate electrode 4, and an organic semiconductor film 3 is further laminated thereon.
- On the organic semiconductor film 3, a drain electrode 5 and a source electrode 6 are separately laminated in different regions, respectively, and are arranged so that the drain electrode 5 and the source electrode 6 do not contact each other.
- the gate electrode 4 is shown in FIG. 1 as a structure laminated on the substrate 1 as described above for convenience of explanation. However, in the organic TFT actually manufactured in the present embodiment, the substrate 1 and the gate electrode 4 are integrated, and the portion of the upper surface of the substrate 1 where the gate insulating layer 2 is not stacked functions as the gate electrode 4.
- the structure also serves as
- the production of the organic TFT shown in FIG. 1 was specifically performed as follows. As described above, a plurality of organic TFTs were manufactured, but all of them were manufactured by the same method except for a part of the organic TFTs.
- a silicon (Si) plate having a low resistivity (0.1 to 10 QCDI) was prepared, and this was used as the substrate 1 serving also as the gate electrode 4.
- the upper surface of the substrate 1 Some of the by thermal oxidation treatment to form a Si0 2 layer of thickness 300 nm, and the Si0 2 layer and Gate insulating layer 2.
- the other portion of the upper surface of the substrate 1 was not subjected to the thermal oxidation treatment and the silicon was left exposed, and the electrical contact (measurement connection point) of the gate electrode 4 was taken from this portion.
- a conductive paste (not shown) was provided at the electrical contact (connection point for measurement).
- the gate electrode 4 to provide an electrical contact point may be provided a portion that Ru expose the silicon (Si) substrate by removing a part of the previous SL Si0 2 layer by a method such as etching or grinding.
- P 3HT poly (3-hexylthiophene)
- an organic solvent use chloroform, black benzene, benzene, para-xylene or a mixed solvent thereof.
- the concentration of 311 was adjusted to 0.5 to 1.0% by weight.
- this solution was sonicated for 30 to 90 minutes to dissolve P 3 HT well, and further filtered through a filter having a mesh of 0.1 to 0.2 zm to completely remove insolubles.
- this solution was applied to the upper surface of the gate insulating layer 2 by a spin coating method.
- the substrate rotation speed during the spin coating method was 2000 rpm, and the operation time was 20 seconds.
- This was heated and dried at 50 to 120 ° C. for 60 minutes to form an organic semiconductor layer 3 having a thickness of 100 to 200 nm.
- Au electrode films having a thickness of about 20 to 100 nm are formed in two places by a vacuum evaporation method using a shadow mask and a wire, and these are used as a drain electrode 5 and a source electrode 6 as a target.
- Organic TFT was obtained.
- the length L was set to 50 m.
- the values of the weight-average molecular weight Mw, number-average molecular weight Mn, and molecular weight distribution width Mw / Mn of P 3 HT used for the organic semiconductor layer 3 for a part of the plurality of organic TFTs thus manufactured are shown below. See Table 1.
- Example 1 those having a molecular weight distribution width of 1.85 or less are referred to as Example 1
- Comparative Examples those having a molecular weight distribution exceeding 1.85 are referred to as Comparative Examples.
- the visible light-ultraviolet absorption spectrum was measured before forming the organic semiconductor layer 3 after completely removing the insoluble matter by filtering the organic semiconductor layer 3 forming solution. .
- a part of the solution was sampled and diluted to the predetermined concentration (0.01% by weight) before measurement.
- FIG. 2 shows a part of the measurement results.
- the ⁇ 3 ⁇ solution of the comparative example showed only one peak as shown in FIG. 2 ⁇ (designated as spectrum state A), but the P 3 HT solution of Example 1 was shown in FIG. 2B. Thus, it was found that two or more peaks were shown (spectral state B).
- FIG. 3 shows an example of the measurement results.
- the P 3HT solution of the comparative example Although only one peak was shown as shown in FIG. 3A (assuming that the spectrum state is A), the P 3 HT solution of Example 1 showed two or more peaks as shown in FIG. 3B ( Spectral state B). (Voltage-current characteristics)
- the voltage-current characteristics of the organic TFT manufactured as described above were evaluated. That is, first, as shown in FIG. 1, a gate voltage V g and a drain voltage V ds were applied to the organic TFT, and a channel current I ds was measured. Further, V g and V ds were changed, and the carrier mobility was calculated from the relationship between V g and I ds in the saturation region. Note that the saturation region is a region where the value of V ds is equal to or greater than a certain value. In this region, the value of I ds is constant regardless of the value of v ds .
- the carrier mobility in the saturation region was calculated based on the following theoretical formula. That is, it is known that the relationship represented by the following equation [1] holds between V g , I ds, and carrier mobility in the saturation region.
- I ds ( ⁇ C IN ⁇ W (V g -V TH ) 2 ) / 2L [1]
- I ds is the channel current (A)
- V g is the gate voltage (V).
- C IN is the capacitance per unit area of the gate insulating layer
- W is the channel width
- V TH is the gate threshold voltage at which the channel begins to form.
- L is the channel length.
- the Kiyaria mobility in organic TF T of Comparative example has been made in the range of 2.57X10- 5 ⁇ 7.20X10- 5 (cniVV ' s), in example 1 2.98X10— 4 to 5.49X10 (cmVV-s), which is a significant improvement, as shown above, even when materials with exactly the same molecular structure are used, the molecular weight distribution width and the state of the visible and ultraviolet spectrum are appropriate. It can be seen that by setting to, the carrier mobility can be improved to 10 times or more.
- a comparative example of a carrier mobility in organic T FT is 2.57X 10 - 5 ⁇ 7.20X10- 5 ( cinVV - s) range, Example 1, 2.98X 1 ( ⁇ 4 ⁇ 5 ⁇ 49 X 10- 4 - Although been made in the range of (cmVV s), in example 2, 7.60X10- 3 ⁇ 1.30 X10- 2.
- organic TFT of example 1 Showed a high carrier mobility of at least 10 times that of the organic TFT of the comparative example, but the organic TFT of Example 2 had an extremely high carrier mobility of at least 10 times to several tens times that of Example 1. showed that.
- the graph of FIG. 9A shows an XRD spectrum diagram of the organic semiconductor film 3 for one of the organic TFTs of the first embodiment
- the graph of FIG. 9B shows one of the organic TFTs of the second embodiment.
- the XRD spectrum of the organic semiconductor film 3 is shown for each of them.
- the vertical axis is the relative intensity (Intensity) of the diffracted X-rays.
- the horizontal axis is the scattering angle 20 and the unit is degree (°).
- the scattering angle 20 shows a clear peak around 5.5 °, indicating that the P 3 HT molecules are regularly arranged.
- the broken line in the figure is an approximate line showing a spectrum diagram when there is no peak in the figure.
- i and i for both embodiments respectively. Derive i / i.
- Example 2 before the formation of the organic semiconductor film, water was dropped on the surface of the gate insulating layer to measure the wettability (contact angle). ° and 13 ° or less in Example 2. That is, in Example 2, it was confirmed that the plasma etching treatment significantly improved the wettability of the gate insulating layer as compared with Example 1.
- the contact angle of 13 ° is the lower limit of the measurement by the measuring device (Model G-1 (trade name) of Elma Sales Co., Ltd.) that performed this wettability measurement.
- the organic semiconductor film 3 was formed, and the carrier mobility and the visible / ultraviolet absorption spectrum were measured in the same manner as described above.
- the carrier mobility is improved as compared with the case where the solution immediately after filtration is used immediately without standing, and the spectral peaks (two) also appear more clearly and shift to the longer wavelength side. I found out. If the P 3 HT solution is gelled or semi-solidified while standing, it is heated at about 50 to 100 ° C. to return to a liquid state, and then the organic semiconductor film 3 is formed. As shown in the figure, good carrier mobility and spectrum peak were obtained.
- the present invention it is possible to provide an organic semiconductor film which can be used for, for example, an electronic device and which can obtain a high-performance TFT by using the organic TFT in particular, and a method of manufacturing the same.
- the carrier mobility can be increased by 10 times or more by appropriately setting the molecular weight distribution width and the state of the visible / ultraviolet spectrum. It can greatly improve the performance of electronic devices.
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Description
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2004
- 2004-08-25 JP JP2005513508A patent/JPWO2005022660A1/ja not_active Withdrawn
- 2004-08-25 WO PCT/JP2004/012581 patent/WO2005022660A1/ja active Application Filing
- 2004-08-25 US US10/568,934 patent/US20080217604A1/en not_active Abandoned
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JP2006060116A (ja) * | 2004-08-23 | 2006-03-02 | Konica Minolta Holdings Inc | 有機薄膜トランジスタ材料、有機薄膜トランジスタ、電界効果トランジスタ及びスイッチング素子 |
JP2006232986A (ja) * | 2005-02-24 | 2006-09-07 | Mitsubishi Chemicals Corp | 導電性高分子並びにそれを用いた有機電子デバイス及び電界効果トランジスタ |
JP2007123580A (ja) * | 2005-10-28 | 2007-05-17 | Konica Minolta Holdings Inc | 有機半導体薄膜の形成方法及び有機薄膜トランジスタ |
JP2008078129A (ja) * | 2006-08-25 | 2008-04-03 | Sumitomo Chemical Co Ltd | 有機薄膜の製造方法 |
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Also Published As
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US20080217604A1 (en) | 2008-09-11 |
JPWO2005022660A1 (ja) | 2006-10-26 |
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