WO2015019717A1 - 金属酸化物膜の製造方法、及びトランジスタの製造方法 - Google Patents
金属酸化物膜の製造方法、及びトランジスタの製造方法 Download PDFInfo
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Definitions
- the present invention relates to a method for manufacturing a metal oxide film and a method for manufacturing a transistor.
- the present invention claims the priority of Japanese Patent Application No. 2013-164248 filed on August 7, 2013. For designated countries where weaving by reference is allowed, the contents described in the application are as follows: Is incorporated into this application by reference.
- Metal oxides such as aluminum oxide and silicon oxide are used for applications such as semiconductor devices and optical thin films. It is desired to form a metal oxide with a desired film thickness in a desired place. If a thin film can be formed more easily, it leads to low cost and high throughput.
- Patent Document 1 a high-affinity region having a high affinity for particles of a film-forming material and a low-affinity region having a lower affinity than the affinity region are formed on the film-forming surface of the substrate. And using a sputtering apparatus provided with an electron trapping portion between the substrate and the substrate, particles of the film forming material are allowed to fly onto the film forming surface, and the film forming material is selectively applied to the high affinity region. And a step of depositing the film.
- a film forming material is selectively deposited on a substrate using a sputtering apparatus.
- a technique for forming a metal oxide film by a dry method using a sputtering method or a vapor deposition method is known.
- the dry method is mainly performed using a vacuum apparatus, the cost tends to be higher and the throughput tends to be lower than when the dry method is performed.
- the present invention has been made in view of such circumstances, and an object thereof is to provide a technique for efficiently obtaining a metal oxide film having good adhesion.
- An aspect of the present invention has been made to achieve the above object, and a method for producing a metal oxide film according to the present invention includes a coating step of coating a solution containing an organometallic complex on a substrate, and the obtained coating.
- the method for producing a metal oxide film according to an aspect of the present invention may be characterized in that the heating temperature in the heating step is 180 degrees or less.
- the method for producing a metal oxide film according to an aspect of the present invention further includes a cleaning step of cleaning the substrate with an organic solvent after the ozone exposure step, wherein the coating film is selectively applied in the ozone exposure step. It may be characterized by exposure to ozone.
- the organometallic complex may be at least one metal complex having 4 to 30 total carbon atoms in one molecule.
- the organometallic complex is an acetylacetonate metal complex
- the solvent of the solution containing the organometallic complex is at least one of alcohols, ketones, ethers, halogenated hydrocarbons, and cyclic hydrocarbons. May be included.
- the metal oxide film may include at least four elements of Al, O, C, and H, and a total of the composition ratios of C and H between the four elements may be 70% or more. .
- the organic solvent used in the washing step may include at least one of alcohols, ketones, ethers, halogenated hydrocarbons, and cyclic hydrocarbons.
- a method for manufacturing a transistor according to an aspect of the present invention includes a step of forming a gate electrode on a substrate, a step of applying a solution containing an organometallic complex to the substrate, and a coating film obtained selectively by ozone. Exposing the substrate, washing the substrate with an organic solvent, baking the coating to obtain an insulating film, and forming a source electrode, a drain electrode, and a semiconductor layer.
- the metal oxide film according to an aspect of the present invention is a metal oxide film containing at least four elements of Al, O, C, and H, and the sum of the composition ratios of C and H between the four elements. Is 70% or more.
- FIG. 1 is a cross-sectional view for explaining an example of a method for producing a metal oxide film according to this embodiment.
- an organometallic complex solution 1 is prepared.
- the organometallic complex solution 1 is obtained by dissolving the organometallic complex 11 in the solvent 12.
- materials used for the organometallic complex 11 include Cu (acac) 2, Mn (acac) 3, VO (acac) 2, Fe (acac) 3, Co (acac) 3, and Zn (acac) 2.
- Metal acetylacetonate complexes can be used. “Acac” represents acetylacetonate.
- the solvent 12 may be a liquid in which the organometallic complex 11 is soluble.
- ethanol propanol, butanol, pentanol, hexanol, octanol, nonanol, benzyl alcohol, methylcyclohexanol, ethanediol, propanediol, butanediol, Alcohols such as pentanediol, hexanediol, octanediol, hexanetriol, butyl formate, pentyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, pentyl acetate, hexyl acetate, benzyl acetate, 3-methoxybutyl acetate 2-ethylbutyl acetate, 2-ethylhexyl acetate, methyl propionate, ethyl
- dimethylformamide, dimethylacetamide, diethylformamide, diethylacetamide and other amides dimethylketone, methylethylketone, pentanone, hexanone, methylisobutylketone, heptanone, diisobutylketone, etc., nitriles such as acetonitrile, diethyl ether, Ethers such as dipropyl ether, diisopropyl ether, dibutyl ether, dihexyl ether, cyclic ethers such as anisole, tetrahydrofuran, tetrahydropyran, dimethoxyethane, diethoxyethane, dibutoxyethane, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, ethylene glycol di Ethylene glycol ethers such as butyl ether, methyl Acetals such as benzene, hexane,
- the organometallic complex solution 1 is applied over the substrate 2 to form a film 10.
- a commonly used substrate material can be used.
- a resin substrate such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide, or a semiconductor substrate such as silicon (Si), gallium arsenide (GaAs), gallium nitride (GaN), or silicon dioxide (SiO2)
- An oxide substrate such as sapphire or zinc oxide (ZnO) can be used.
- a well-known coating method can be used, for example, the organometallic complex solution 1 is applied to the board
- a coating method it is not limited to such a coating method, It is possible to select another coating method suitably according to the uniformity of the film
- a mask 21 having a desired opening pattern is prepared on the coating 10 of the organometallic complex solution 1.
- the mask 21 for example, a metal mask, a patterned photoresist, or the like can be used.
- the metal mask may be disposed so as to be in direct contact with the coating 10 or may be disposed with a gap between the coating 10 so as not to contact the coating 10. Then, in order to expose the coating 10 to ozone corresponding to the opening pattern of the mask in the fourth step described later, when the mask 21 is placed in contact with the coating 10, it is between the non-opening portion of the mask 21 and the coating 10.
- Exposure to ozone can be prevented, and a desired pattern tends to be easily obtained.
- a patterned photoresist can be obtained by forming a photoresist on the film 10 and performing a normal lithography process.
- the coating 10 is exposed to ozone 22 through a mask 21.
- an exposure method to ozone 22 for example, in addition to a method of exposing to ozone 22 using an ozone cleaning device that generates ozone with light having a wavelength of about 250 mm or less included in ultraviolet light, ozone generated by an ozonizer or the like
- FIG. 1E shows the substrate 2 obtained as a result of exposing the coating 10 to the ozone 22. Since the film 10 is selectively covered with the mask 21 in the third step, when the substrate 2 on which the film 10 is formed is exposed to the ozone 22, the film 10a not exposed to the ozone 22 and the ozone 22 are exposed. The exposed film 10b is formed.
- the coating 10a not exposed to ozone has low resistance to the organic solvent.
- the coating 10b exposed to the ozone 22 breaks or recombines chemical bonds in the structure of the organometallic complex, and becomes highly resistant to organic solvents such as alcohol and acetone. That is, there is a difference in easiness of dissolution in an organic solvent between a portion exposed to the ozone 22 of the coating 10 and a portion not exposed.
- the substrate 2 provided with the coating 10a and the coating 10b is cleaned by contacting with an organic solvent.
- the organic solvent used for washing may be any organic solvent complex used in the first step, but here, for example, ethanol, propanol, butanol, pentanol, hexanol, octanol, nonanol, benzyl alcohol, methylcyclohexanol Alcohols such as ethanediol, propanediol, butanediol, pentanediol, hexanediol, octanediol, hexanetriol, butyl formate, pentyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, pentyl acetate, acetic acid Hexyl, benzyl acetate, 3-methoxybuty
- the film 10a Since the film 10a has low resistance to an organic solvent, it is dissolved by washing, but the film 10b remains without being dissolved. Therefore, patterning can be formed between the ozone exposed portion and the unexposed portion. In addition, it is sufficient to immerse in an organic solvent, but the treatment time can be shortened by using ultrasonic cleaning or stirring. If the cleaning time is too short, the coating 10a is not sufficiently dissolved, and if the cleaning time is too long, the coating 10b may be dissolved. Therefore, the cleaning time depends on the type of the organometallic complex and the organic solvent. Is set as appropriate.
- the coating film 10b is subjected to heat treatment (firing).
- heat treatment since a high dielectric constant is obtained when heating temperature is 180 degrees C or less, it is desirable to heat at 180 degrees C or less.
- a film 10c that is a metal oxide having high adhesion between the film 10b and the substrate 2 is formed.
- a selective metal oxide film can be efficiently obtained by forming a film by a wet method and performing patterning using ozone. Since it is not necessary to use a strong corrosive acid as an etching solution for patterning, it is possible to prevent the wiring and the substrate from being damaged.
- FIG. 2 is a cross-sectional view for explaining an example of a method for producing a metal oxide film according to this modification.
- a transistor is manufactured using the metal oxide film formed by the above-described embodiment.
- the gate electrode 31 is formed on the substrate 2a.
- the gate electrode is formed using a known photolithography technique.
- the organometallic complex solution 1 prepared in the same manner as in the above-described embodiment is applied to form a coating 10A. Since the coating 10 ⁇ / b> A will be an insulator layer of the transistor later, it is desirable to apply the coating 10 ⁇ / b> A to cover the gate electrode 31.
- a mask 21 is prepared on the film formed by the organometallic complex solution 1.
- the mask 21 may be a metal mask, or the mask 21 may be formed by applying and patterning a resist.
- the mask 21 may be formed so as to be in contact with the coating 10 ⁇ / b> A formed by the organometallic complex solution 1.
- the coating 10A is washed with an organic solvent in the same manner as in the above-described embodiment.
- the organic solvent is acetone or the like as in the above embodiment.
- the portion of the coating 10Ab exposed to the ozone 22 remains on the substrate 2a, and the portion not exposed to ozone is dissolved.
- the coating 10Ab is heat-treated to obtain an insulating film. Note that when aluminum oxide is obtained as the insulating film, it is desirable that the heating temperature be 180 ° C. or lower in order to obtain an insulating film having a high relative dielectric constant.
- a source electrode 32 and a drain electrode 33 are formed over the insulating film.
- the source electrode 32 and the drain electrode 33 are also formed using a known technique such as photolithography in the same manner as the gate electrode.
- an organic or inorganic semiconductor layer 40 is formed over the substrate 2a using a known technique.
- an insulating film having high adhesion can be obtained efficiently without using a strongly acidic organic solvent. Further, since the relative dielectric constant is higher than that of a general insulating film, it has high performance as a gate insulating film of a transistor and is preferable.
- Example 1 (Application) First, with respect to 0.003 mol of aluminum acetylacetonate (manufactured by Tokyo Chemical Industry Co., Ltd.), 35 ml of ethanol (manufactured by Wako Pure Chemical Industries, Ltd.) was added and stirred well, and all of the aluminum acetylacetonate had dissolved. It was confirmed. The obtained organometallic complex solution 1 as a mixed solution was dropped onto a substrate 2 made of Si, and spin-coated with a spin coater for 30 seconds at a rotational speed of 700 rpm.
- the obtained sample was heated at 150 ° C. and fired. Thereby, an aluminum oxide film could be formed as the coating 10c, and a patterning shape similar to the line & space of the metal mask could be formed.
- FIG. 3 is a 140-times SEM image of the obtained aluminum oxide film. It was found that the film was uniformly coated without defects and cracks.
- FIG. 4 is a 600 ⁇ optical microscope image of the obtained aluminum oxide film.
- the left side of FIG. 4 shows the Si substrate region, and the right side shows the aluminum oxide region.
- the boundary between the aluminum oxide film and the Si substrate was confirmed.
- the film thickness was measured with a stylus type step meter (P16 +: manufactured by Tencor), and it was 50 nm.
- FIG. 5 is an SEM image 170 times the line and space of the aluminum oxide film. 5 is a region of aluminum oxide, and the other part is a region of the Si substrate. Lines and spaces similar to the shadow mask width of 200 ⁇ m were formed, indicating that the patterning was successful.
- FIG. 6 is a diagram showing an SEM image 100 times as large as a line and space using an aluminum oxide film and a line scan result by energy dispersive X-ray spectroscopy (EDX).
- EDX energy dispersive X-ray spectroscopy
- a metal oxide film can be formed using a wet method, and that a patterned film can be easily formed without using an etching solution such as fluoride.
- Example 2 As the organometallic complex 11, aluminum acetylacetonate was prepared in the same manner as in Example 1. As in Example 1, the organometallic complex solution 1 was prepared using ethanol, applied to the substrate 2, and exposed to ozone. . Thereafter, unlike Example 1, baking was performed at 150 ° C. for 10 minutes without performing the cleaning which is the fifth step described above.
- FIG. 7 is a 120-times SEM image of the aluminum oxide film obtained thereafter. As can be seen from this result, a line and space could be formed between the ozone exposed part and the unexposed part. About the coating 10a which is an ozone unexposed part, since a certain degree of sublimation was seen in the heating process without passing through the cleaning process, a line and space was formed.
- FIG. 8 is a diagram showing an SEM image 120 times as large as a line and space using an aluminum oxide film and a line scan result using EDX.
- the line scan Al and Si were scanned in the same manner as in Example 1.
- the line (b) shows the Al scan result. According to this, it was found that there was a difference in the detected amount of Al between the ozone exposed part and the unexposed part.
- the film thickness difference between the line and space was measured with a step gauge, it was 50 nm as in Example 1. However, unlike the sample performed in Example 1, no residue was observed because washing with an organic solvent was not performed during the process.
- FIG. 9 is a 170 times SEM image of the aluminum oxide film.
- the residue 10d indicates a residue remaining on the Si substrate. It was found that the coating 10a was not completely sublimated even in the ozone unexposed area, and the residue 10d remained depending on the location.
- FIG. 10 is a 120 times SEM image of the obtained aluminum oxide film.
- FIG. 11 is a diagram showing a 120 times SEM image of the obtained aluminum oxide film and a line scan result by EDX. It was found that the contrast between Al and the Si substrate was increased and the residue was reduced.
- Example 3 As the organometallic complex 11, aluminum acetylacetonate was prepared in the same manner as in Example 1, and the organometallic complex solution 1 was prepared using ethanol in the same manner as in Example 1, applied to the substrate 2, and exposed to ozone. Thereafter, cleaning was performed using ethanol for the purpose of removing the unexposed portion of ozone. Thereafter, baking was performed at 150 ° C., and an SEM image was confirmed. As in Example 1, the ozone exposed portion remained and only the ozone unexposed portion was selectively removed to confirm the patterning of the metal oxide film. did.
- Example 4 As organometallic complex 11, aluminum acetylacetonate is prepared in the same manner as in Example 1. As a solvent for dissolving the organometallic complex 11, 35 ml of acetone was used to dissolve the organometallic complex 11 to prepare an organometallic complex solution 1. Next, the organometallic complex solution 1 was applied to the substrate 2 in the same manner as in Example 1 and exposed to ozone. Thereafter, cleaning was performed using acetone for the purpose of removing the ozone unexposed portion. Thereafter, baking was performed at 150 ° C., and an SEM image was confirmed. As in Example 1, the ozone exposed portion remained on the substrate 2 and the patterning of the metal oxide film was confirmed by removing the ozone unexposed portion. did.
- Example 5 As the organometallic complex 11, aluminum acetylacetonate was prepared in the same manner as in Example 1, and 35 ml of acetone was used as a solvent for dissolving the organometallic complex 11. The organometallic complex 11 was dissolved to prepare the organometallic complex solution 1. Next, the organometallic complex solution 1 was applied to the substrate 2 in the same manner as in Example 1 and exposed to ozone. Thereafter, cleaning was performed using ethanol for the purpose of removing the unexposed portion of ozone. Thereafter, baking was performed at 150 ° C., and an SEM image was confirmed. As in Example 1, the ozone exposed portion remained on the substrate 2 and the patterning of the metal oxide film was confirmed by removing the ozone unexposed portion. did.
- Example 6 As the organometallic complex 11, aluminum acetylacetonate was prepared in the same manner as in Example 1, and 15 ml of toluene was used as a solvent for dissolving the organometallic complex 11. The organometallic complex 11 was dissolved to prepare the organometallic complex solution 1. Next, the organometallic complex solution 1 was applied to the substrate 2 in the same manner as in Example 1 and exposed to ozone. Thereafter, cleaning was performed using acetone for the purpose of removing the ozone unexposed portion. Thereafter, baking was performed at 150 ° C., and an SEM image was confirmed. As in Example 1, the ozone exposed portion remained on the substrate 2 and the patterning of the metal oxide film was confirmed by removing the ozone unexposed portion. did.
- Example 7 As the organometallic complex 11, aluminum acetylacetonate was prepared in the same manner as in Example 1, and 35 ml of chloroform was used as a solvent for dissolving the organometallic complex 11. The organometallic complex 11 was dissolved to prepare the organometallic complex solution 1. Next, the organometallic complex solution 1 was applied to the substrate 2 in the same manner as in Example 1 and exposed to ozone. Thereafter, cleaning was performed using acetone for the purpose of removing the ozone unexposed portion. Thereafter, baking was performed at 150 ° C., and an SEM image was confirmed. As in Example 1, the ozone exposed portion remained on the substrate 2 and the patterning of the metal oxide film was confirmed by removing the ozone unexposed portion. did.
- Example 11 aluminum acetylacetonate was prepared in the same manner as in Example 1.
- the organometallic complex solution 1 was prepared using ethanol as a solvent, applied to the substrate 2, and exposed to ozone. It was. Then, when water was used for the purpose of removing the ozone unexposed portion, unlike the other examples, both the ozone exposed portion and the ozone unexposed portion were removed. From this example, it was found that it is preferable to use an anhydrous organic solvent for the cleaning because the patterning of the metal oxide film is difficult when the cleaning is performed with an inorganic solution containing water.
- Example 8 As the organometallic complex 11, 0.003 mol of zinc acetylacetonate (manufactured by Tokyo Chemical Industry Co., Ltd.) was used, and 35 ml of ethanol was used as a solvent. An organometallic complex solution 1 was prepared by dissolving the organometallic complex 11 in a solvent. Thereafter, the organometallic complex solution 1 was applied to the substrate 2 in the same manner as in Example 1, exposed to ozone, washed with acetone, and baked at 150 ° C. As a result, an SEM image of line & space was obtained, and the patterning shape of the zinc oxide film could be confirmed.
- Example 9 (Adjustment of heating temperature) As the organometallic complex 11, aluminum acetylacetonate was prepared in the same manner as in Example 1, and the organometallic complex solution 1 was prepared using ethanol as the solvent 12 in the same manner as in Example 1.
- substrate 2 it apply
- the coating film was washed with acetone for the purpose of removing fine dust adhered to the coating film.
- a gold electrode having a diameter of 2 mm was formed on the obtained aluminum oxide film by sputtering, and the electrical characteristics of the film were measured using the substrate 2 and the gold electrode as upper and lower electrodes.
- a semiconductor parameter analyzer (4200-SCS: manufactured by Keithley) was used for the measurement.
- FIG. 12 is a diagram showing the results of measuring the heating temperature, relative dielectric constant, and breakdown voltage. ⁇ represents the relationship between the heating temperature and the dielectric breakdown voltage, and ⁇ represents the relationship between the heating temperature and the relative dielectric constant. In addition, the numerical values of the measurement results shown in FIG.
- the relative permittivity of general aluminum oxide is 10 or less, but referring to ⁇ , it was found that the relative permittivity tends to be higher than that of general aluminum oxide in the region where the heating temperature is 180 ° C. or less.
- the composition of the aluminum oxide of this example is different from the stoichiometric composition.
- the relative dielectric constant is higher than that of general aluminum oxide, it can be said that the aluminum oxide according to this embodiment is suitable for use as a gate insulating film of a transistor or the like.
- Example 10 As organometallic complex 11, aluminum acetylacetonate was prepared in the same manner as in Example 1, and organometallic complex solution 1 was prepared using isopropyl alcohol as a solvent. The organometallic complex solution 1 was applied to the substrate 2 in the same manner as in Example 1 and exposed to ozone. Then, unlike Example 1, the heat treatment was performed at different temperatures in four patterns without performing the cleaning which is the fifth step. As a result, four types of aluminum oxide films subjected to heat treatment at 120 ° C., 150 ° C., 180 ° C., or 200 ° C. were obtained.
- FIG. 13 is a diagram showing the results of measuring the heating temperature and composition ratio of the aluminum oxide film. Further, the numerical values of the measurement results shown in FIG. 13
- the relative dielectric constant tended to be higher than that of general aluminum oxide in a region where the heating temperature was 180 ° C. or lower.
- the heating temperature was 180 ° C. or higher.
- the high relative dielectric constant in the region of 180 ° C. or lower is derived from CH bonds, and it is considered that the relative dielectric constant increases when the number of CH bonds in the film 10 is large.
- an aluminum oxide film as obtained by the prior art is obtained, but the obtained aluminum oxide film does not exhibit a high relative dielectric constant.
- organometallic complex solution 2, 2a: substrate, 10, 10A, 10a, 10b, 10Ab: coating, 11: organometallic complex, 12: solvent, 31: gate electrode, 32: source electrode, 33: drain electrode, 40: Semiconductor layer
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Abstract
Description
まず、図1(A)に示すように、有機金属錯体溶液1を調製する。有機金属錯体溶液1は、有機金属錯体11を溶媒12に溶解することによって得る。有機金属錯体11に用いられる材料としては、例えば、Cu(acac)2、Mn(acac)3、VO(acac)2、Fe(acac)3、Co(acac)3、Zn(acac)2等の金属アセチルアセトナート錯体を用いることができる。なお、「acac」はアセチルアセトナートを示す。
次に、図1(B)に示すように、基板2上に有機金属錯体溶液1を塗布し、被膜10を形成する。基板2には、一般に用いられる基板材料を用いることができる。例えば、ポリエチレンテレフタレート(PET)、ポリエチレンナフタレート(PEN)、ポリイミド等の樹脂基板、又はケイ素(Si)、ヒ化ガリウム(GaAs)、窒化ガリウム(GaN)等の半導体基板、又は二酸化ケイ素(SiO2)、サファイア、酸化亜鉛(ZnO)等の酸化物基板等を用いることができる。
次に、図1(C)に示すように、有機金属錯体溶液1の被膜10上に、所望の開口パターンを有するマスク21を準備する。マスク21としては、例えばメタルマスクや、パターニングされたフォトレジスト等を用いることができる。なお、メタルマスクを用いる場合、被膜10に直接接触するように配置してもよいし、被膜10に接触しないように被膜10との間に間隙を設けて配置してもよいが、本実施形態では後述の第4の工程でマスクの開口パターンに対応させて被膜10をオゾンに暴露させるため、被膜10に接触させてマスク21を配置すると、マスク21の非開口部と被膜10との間へのオゾンの暴露を防止することができ、より所望のパターンを得やすい傾向にある。なお、フォトレジストを用いる場合、被膜10上にフォトレジストを形成し通常のリソグラフィ工程を行うことでパターニングされたフォトレジストを得ることができる。
次に、図1(D)に示すように、マスク21を介して被膜10をオゾン22に暴露させる。オゾン22への暴露方法としては、例えば、紫外光に含まれる波長約250mm以下の光にてオゾンを発生させるオゾン洗浄装置を用いてオゾン22に暴露させる方法のほか、オゾナイザー等で発生させたオゾン22に暴露させる方法や、酸素とプラズマの反応によってオゾンを発生させるプラズマ発生装置を用いてオゾン22に暴露させる方法等があるが、コストやスループットに基づいて適宜選択する。
次に、図1(F)に示すように、被膜10a及び被膜10bが施された基板2を有機溶媒に接触させて洗浄する。洗浄に用いる有機溶媒は、第1の工程で用いた有機金属錯体が可溶であればよいが、ここでは例えばエタノール、プロパノール、ブタノール、ペンタノール、ヘキサノール、オクタノール、ノナノール、ベンジルアルコール、メチルシクロヘキサノール、エタンジオール、プロパンジオール、ブタンジオール、ペンタンジオール、ヘキサンジオール、オクタンジオール、ヘキサントリオールなどのアルコール類をはじめ、蟻酸ブチル、蟻酸ペンチル、酢酸メチル、酢酸エチル、酢酸プロピル、酢酸ブチル、酢酸ペンチル、酢酸ヘキシル、酢酸ベンジル、3-メトキシブチルアセテート、2-エチルブチルアセテート、2-エチルヘキシルアセテート、プロピオン酸メチル、プロピオン酸エチル、プロピオン酸プロピル、プロピオン酸ブチル、プロピオン酸ペンチルなどのエステル類、ジメチルホルムアミド、ジメチルアセトアミド、ジエチルホルムアミド、ジエチルアセトアミドなどのアミド類、ジメチルケトン、メチルエチルケトン、ペンタノン、ヘキサノン、メチルイソブチルケトン、ヘプタノン、ジイソブチルケトンなどのケトン類、アセトニトリルなどのニトリル類、ジエチルエーテル、ジプロピルエーテル、ジイソプロピルエーテル、ジブチルエーテル、ジヘキシルエーテルなどのエーテル類、アニソール、テトラヒドロフラン、テトラヒドロピランなどの環状エーテル類、ジメトキシエタン、ジエトキシエタン、ジブトキシエタン、ジエチレングリコールジメチルエーテル、ジエチレングリコールジエチルエーテル、エチレングリコールジブチルエーテルなどのエチレングリコールエーテル類、メチラール、アセタールなどのアセタール類、ペンタン、ヘキサン、ヘプタン、オクタン、ノナン、デカン、ドデカンなどのパラフィン系炭化水素類、トルエン、キシレン、エチルベンゼン、クメン、ミシチレン、テトラリン、ブチルベンゼン、シメン、ジエチルベンゼン、ペンチルベンゼン、ジペンチルベンゼン、シクロペンタン、シクロヘキサン、メチルシクロヘキサン、エチルシクロヘキサン、デカリンなどの環状炭化水素類、クロロメタン、ジクロロメタン、トリクロロメタン(クロロホルム)、テトラクロロメタン、クロロエタン、ジクロロエタン、トリクロロエタン、テトラクロロエタン、ペンタクロロエタン、クロロプロパン、ジクロロプロパン、トリクロロプロパン、クロロブタン、ジクロロブタン、トリクロロブタン、クロロペンタン、クロロベンゼン、ジクロロベンゼン、クロロトルエン、ジクロロトルエン、ブロモメタン、ブロモプロパン、ブロモベンゼン、クロロブロモエタンなどのハロゲン化炭化水素類、を用いることができる。被膜10aは有機溶媒に対する耐性が低いため、洗浄によって溶解するが、被膜10bは溶解せずに残存する。従って、オゾン暴露部分と未暴露部分とでパターニング形成が可能となる。なお、洗浄は有機溶媒に漬け置くことで足りるが、超音波洗浄を用いたり撹拌したりすることで、処理時間を短縮することができる。なお、洗浄時間が短すぎると被膜10aが十分に溶解されず、また、洗浄時間が長すぎると被膜10bまで溶解してしまう場合があるので、洗浄時間は有機金属錯体や有機溶媒の種類に応じて適宜設定される。
次に、図1(G)に示すように、被膜10bを加熱処理(焼成)する。加熱処理については、加熱温度が180℃以下である場合に高い誘電率が得られるため、180℃以下で加熱を行うのが望ましい。加熱処理により、被膜10bと基板2との高い密着性を有する金属酸化物である被膜10cが形成される。
次に、本実施形態の変形例について説明する。
まず、図2(A)に示すように、基板2aに対してゲート電極31を形成する。ゲート電極は、公知のフォトリソグラフィ技術を用いて形成されるものとする。
次に、図2(B)に示すように、上述の実施形態と同様に調製した有機金属錯体溶液1を塗布し、被膜10Aを形成する。被膜10Aは後にトランジスタの絶縁体層となるため、ゲート電極31を覆うよう塗布することが望ましい。
次に、図2(C)に示すように、有機金属錯体溶液1により形成された被膜上に、マスク21を準備する。マスク21はメタルマスクであってもよいし、レジストを塗布、パターニングすることによってマスク21を形成してもよい。なお、マスク21は有機金属錯体溶液1により形成された被膜10Aに接触するよう形成してもよい。
次に、図2(D)に示すように、被膜10Aをオゾン22に暴露させる。暴露方法は、上述の実施形態と同様である。
次に、図2(E)に示すように、上述の実施形態と同様に被膜10Aを有機溶媒で洗浄する。有機溶媒は上述の実施形態と同様、アセトン等である。洗浄によって、オゾン22に暴露された被膜10Ab部分が基板2aに残り、オゾン未暴露部分は溶解する。その後、被膜10Abを加熱処理し、絶縁膜を得る。なお、絶縁膜として酸化アルミニウムを得る場合、比誘電率の高い絶縁膜を得るために、加熱温度を180℃以下とすることが望ましい。
次に、図2(F)に示すように、絶縁膜上にソース電極32とドレイン電極33とを形成する。ソース電極32及びドレイン電極33の形成も、ゲート電極と同様にフォトリソグラフィ等の公知の技術を用いる。
次に、図2(G)に示すように、公知の技術を用いて、基板2a上に有機又は無機の半導体層40を形成する。
(塗布)
まず、アルミニウムアセチルアセトナート0.003mol(東京化成工業(株)製)に対して、エタノール(和光純薬工業(株)製)35mlを加えてよく撹拌し、アルミニウムアセチルアセトナートがすべて溶解したことを確認した。得られた混合溶液である有機金属錯体溶液1をSiからなる基板2上に滴下し、スピンコーターにて回転数700rpm、30秒間、回転塗布した。
その後、得られた試料にメタルマスクを載せ、UVオゾン洗浄機(OC-2506:岩崎電気(株)製)にて10分間オゾンに暴露した。メタルマスクの形状は、200μm幅のライン&スペースである。オゾン暴露後には、暴露していた部分と未暴露部分とではコントラスト差がついており、相変化が起こっていることが予測された。オゾン暴露後、有機溶媒であるアセトンに漬け、5分間放置した。その後、アセトンから試料を取り出し、エアーガンでブローし、エタノール、蒸留水の順で洗浄し、エアーブローを行った。
その後、得られた試料を150℃にて加熱し、焼成した。これにより、被膜10cとして酸化アルミニウム膜が形成でき、メタルマスクのライン&スペースと同様のパターニング形状が形成できた。
図3は、得られた酸化アルミニウム膜の140倍のSEM像である。欠陥やクラックもなく均一に被膜されていることが分かった。
有機金属錯体11として、アルミニウムアセチルアセトナートを実施例1と同様に準備し、実施例1と同様に、エタノールを用いて有機金属錯体溶液1を調製、基板2に塗布し、オゾン暴露を行った。その後、実施例1と異なり、上述の第5の工程である洗浄を行わずに、150℃にて10分間焼成を行った。
有機金属錯体11として、アルミニウムアセチルアセトナートを実施例1と同様に準備し、実施例1と同様にエタノールを用いて有機金属錯体溶液1を調製、基板2に塗布し、オゾン暴露を行った。その後、オゾン未暴露部の除去を目的として、エタノールを用いて洗浄を行った。その後、150℃で焼成し、SEM像で確認したところ、実施例1と同様に、オゾン暴露部が残り、オゾン未暴露部のみが選択的に除去されることによる金属酸化物膜のパターニングを確認した。
有機金属錯体11として、アルミニウムアセチルアセトナートを実施例1と同様に準備する。有機金属錯体11を溶解する溶媒として、アセトン35mlを用い、有機金属錯体11を溶解させ、有機金属錯体溶液1を調製した。次に、実施例1と同様の方法で基板2に有機金属錯体溶液1を塗布し、オゾン暴露を行った。その後、オゾン未暴露部の除去を目的として、アセトンを用いて洗浄を行った。その後、150℃で焼成し、SEM像で確認したところ、実施例1と同様に、オゾン暴露部が基板2上に残り、オゾン未暴露部が除去されることによる金属酸化物膜のパターニングを確認した。
有機金属錯体11として、アルミニウムアセチルアセトナートを実施例1と同様に準備し、有機金属錯体11を溶解する溶媒として、アセトン35mlを用いた。有機金属錯体11を溶解させ、有機金属錯体溶液1を調製した。次に、実施例1と同様の方法で基板2に有機金属錯体溶液1を塗布し、オゾン暴露を行った。その後、オゾン未暴露部の除去を目的として、エタノールを用いて洗浄を行った。その後、150℃で焼成し、SEM像で確認したところ、実施例1と同様に、オゾン暴露部が基板2上に残り、オゾン未暴露部が除去されることによる金属酸化物膜のパターニングを確認した。
有機金属錯体11として、アルミニウムアセチルアセトナートを実施例1と同様に準備し、有機金属錯体11を溶解する溶媒として、トルエン15mlを用いた。有機金属錯体11を溶解させ、有機金属錯体溶液1を調製した。次に、実施例1と同様の方法で基板2に有機金属錯体溶液1を塗布し、オゾン暴露を行った。その後、オゾン未暴露部の除去を目的として、アセトンを用いて洗浄を行った。その後、150℃で焼成し、SEM像で確認したところ、実施例1と同様に、オゾン暴露部が基板2上に残り、オゾン未暴露部が除去されることによる金属酸化物膜のパターニングを確認した。
有機金属錯体11として、アルミニウムアセチルアセトナートを実施例1と同様に準備し、有機金属錯体11を溶解する溶媒として、クロロホルム35mlを用いた。有機金属錯体11を溶解させ、有機金属錯体溶液1を調製した。次に、実施例1と同様の方法で基板2に有機金属錯体溶液1を塗布し、オゾン暴露を行った。その後、オゾン未暴露部の除去を目的として、アセトンを用いて洗浄を行った。その後、150℃で焼成し、SEM像で確認したところ、実施例1と同様に、オゾン暴露部が基板2上に残り、オゾン未暴露部が除去されることによる金属酸化物膜のパターニングを確認した。
有機金属錯体11として、アルミニウムアセチルアセトナートを実施例1と同様に準備し、実施例1と同様に溶媒にエタノールを用いて有機金属錯体溶液1を調製、基板2に塗布し、オゾン暴露を行った。その後、オゾン未暴露部の除去を目的として、水を用いたところ、他の実施例と異なり、オゾン暴露部及びオゾン未暴露部共に被膜が除去された。本実施例から、水を含んでいる無機溶液で洗浄を行うと金属酸化物膜のパターニングが困難であるため、洗浄には無水の有機溶媒を用いることが好適であることが分かった。
有機金属錯体11として、亜鉛アセチルアセトナート0.003mol(東京化成工業(株)製)を用い、溶媒としてエタノール35mlを用いた。溶媒に有機金属錯体11を溶解させ、有機金属錯体溶液1を作成した。その後、実施例1と同様の方法で基板2に有機金属錯体溶液1を塗布し、オゾン暴露を行い、アセトンを用いて洗浄を行い、150℃で焼成した。その結果、ライン&スペースのSEM像が得られ、酸化亜鉛膜のパターニング形状が確認できた。
有機金属錯体11として、アルミニウムアセチルアセトナートを実施例1と同様に準備し、実施例1と同様に溶媒12にエタノールを用いて有機金属錯体溶液1を調製した。有機金属錯体溶液1を基板2に塗布する際、膜厚が200nmとなるように塗布した。次に、塗膜に付着した微細なごみ除去を目的として、塗膜をアセトンで洗浄した。次に、マスクを用いたパターニングは行わず、実施例1と同様の方法で塗膜をオゾンに暴露させた。その後、120℃から200℃の範囲で、数パターンの焼成を行った。焼成後、得られた酸化アルミニウム膜上に直径2mmの金電極をスパッタ法にて形成し、基板2と金電極を上部・下部電極として膜の電気特性を測定した。測定には半導体パラメータアナライザー(4200-SCS:keithley社製)を用いた。
有機金属錯体11として、アルミニウムアセチルアセトナートを実施例1と同様に準備し、溶媒としてイソプロピルアルコールを用いて有機金属錯体溶液1を調製した。有機金属錯体溶液1を実施例1と同様に基板2に塗布し、オゾン暴露を行った。その後、実施例1と異なり、第5の工程である洗浄を行わずに、4パターンの異なる温度で加熱処理を行った。結果として、120℃、150℃、180℃、又は200℃で加熱処理が行われた4種類の酸化アルミニウム膜を得た。
Claims (9)
- 有機金属錯体を含む溶液を基板に塗布する塗布工程と、
得られた塗膜をオゾンに暴露するオゾン暴露工程と、
前記塗膜を加熱する加熱工程と、
を備えることを特徴とする金属酸化物膜の製造方法。 - 請求項1に記載の金属酸化物膜の製造方法であって、
前記加熱工程における加熱温度が180度以下である
ことを特徴とする金属酸化物膜の製造方法。 - 請求項1又は2に記載の金属酸化物膜の製造方法であって、
前記オゾン暴露工程の後に前記塗膜を有機溶媒に接触させる洗浄工程をさらに備え、
前記オゾン暴露工程では、前記塗膜を選択的にオゾンに暴露する
ことを特徴とする金属酸化物膜の製造方法。 - 請求項1から3のいずれか一項に記載の金属酸化物膜の製造方法であって、
前記有機金属錯体は、1分子中の全炭素数が4~30である金属錯体の少なくとも1種である
ことを特徴とする金属酸化物膜の製造方法。 - 請求項1から4のいずれか一項に記載の金属酸化物膜の製造方法であって、
前記有機金属錯体は、アセチルアセトナート金属錯体であり、
前記有機金属錯体を含む溶液の溶媒は、アルコール類、ケトン類、エーテル類、ハロゲン化炭化水素類、環状炭化水素類の少なくとも1種を含む
ことを特徴とする金属酸化物膜の製造方法。 - 請求項1から5のいずれか一項に記載の金属酸化物膜の製造方法であって、
前記金属酸化物膜は、少なくともAlとOとCとHの4つの元素を含み、前記4つの元素間におけるCとHの組成比の合計が70%以上であることを特徴とする金属酸化物膜の製造方法。 - 請求項3から5のいずれか一項に記載の金属酸化物膜の製造方法であって、
前記洗浄工程で用いる前記有機溶媒は、アルコール類、ケトン類、エーテル類、ハロゲン化炭化水素類、環状炭化水素類の少なくとも1種を含む
ことを特徴とする金属酸化物膜の製造方法。 - 基板上にゲート電極を形成する工程と、
有機金属錯体を含む溶液を前記基板に塗布する工程と、
得られた塗膜を選択的にオゾンに暴露する工程と、
前記基板を有機溶媒で洗浄する工程と、
前記塗膜を焼成して絶縁膜を得る工程と、
ソース電極、ドレイン電極、及び半導体層を形成する工程と、
を備えることを特徴とするトランジスタの製造方法。 - 少なくともAlとOとCとHの4つの元素を含む金属酸化物膜であって、
前記4つの元素間におけるCとHの組成比の合計が70%以上であることを特徴とする金属酸化物膜。
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| KR102899918B1 (ko) * | 2018-03-02 | 2025-12-12 | 램 리써치 코포레이션 | 가수분해를 사용한 선택적인 증착 |
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| CN115491194B (zh) * | 2021-06-18 | 2023-11-03 | 广东聚华印刷显示技术有限公司 | 氧化锌的前驱体溶液及其制备方法与发光器件 |
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| CN105408244B (zh) | 2019-04-12 |
| CN105408244A (zh) | 2016-03-16 |
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