JP2006162791A - Positive photosensitive resin composition, and semiconductor device and display element using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a positive photosensitive resin composition having such properties as to ensure little wear of film, neither collapse of pattern shape nor occurrence of residue of the positive photosensitive resin composition (scum) in an exposed portion, having high sensitivity and high resolution, and excellent in physical properties of a cured film. <P>SOLUTION: The positive photosensitive resin composition contains a polyamidoimide resin (A), a compound (B) which generates an acid under light and a compound (C) having a phenolic hydroxyl group, wherein the component (C) preferably contains one of a biphenyl skeleton and a bisphenol skeleton. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a positive photosensitive resin composition, and a semiconductor device and a display element using the same.

  Conventionally, polyimide resins and polybenzoxazole resins having excellent heat resistance and excellent electrical characteristics, mechanical characteristics, and the like have been used for surface protective films and interlayer insulating films of semiconductor elements (Patent Document 1). These resin layers can be formed by applying and patterning a resin composition containing these resins on the surface of the semiconductor element and finally curing at a high temperature.

  However, in recent years, it has been strongly desired to reduce the thermal history of the semiconductor element as much as possible by increasing the integration and size of the semiconductor element, making the semiconductor device thinner and smaller, and shifting to surface mounting by solder reflow. There is a demand for significant improvement in the curing temperature and reflow resistance of these resins.

Conventionally used polybenzoxazole resins have not been finally cured unless heated to about 300 ° C. Further, when a polyimide resin with little problem of curing temperature is used, there is a problem that the solubility in alkali is low and the resolution is lowered during development.
JP-A-1-46862

However, the prior art described in the above literature has room for improvement in the following points.
First, since the curing temperature is high, there is a problem that heat damage is caused to a highly integrated semiconductor element or the like at the final curing stage.
Secondly, when the curing temperature is lowered, the ring closure rate of the benzoxazole ring and the imide ring is lowered, and the cured film properties such as solvent resistance are deteriorated.
This invention is made | formed in view of the said situation, The place made into the objective is to provide the resin composition which can be thermoset at low temperature. Another object of the present invention is to provide a resin composition having high resolution and excellent cured film properties such as reflow resistance and solvent resistance.

［２］
（Ｃ）がフェノール性水酸基を分子内に２個以上有する化合物である［１］記載のポジ型感光性樹脂組成物。
［３］
（Ｃ）がビフェニル骨格、ビスフェノール骨格のいずれかを含むものである［１］または［２］記載のポジ型感光性樹脂組成物。
［４］
光により酸を発生する化合物（Ｂ）が、フェノール化合物と１，２−ナフトキノン−２−ジアジド−５−スルホン酸又は１，２−ナフトキノン−２−ジアジド−４−スルホン酸とのエステル化合物である［１］〜［３］記載のポジ型感光性樹脂組成物。
［５］
ポリアミドイミド樹脂（Ａ）が一般式（２）で示される構造を有するポリアミドイミド樹脂である［１］〜［４］記載のポジ型感光性樹脂組成物。

（Ｘは４価の有機基で互いに同一でも異なっても良い。Ｒ₁は水素原子又は炭素数１〜１５の有機基で互いに同一でも異なっても良い。Ｙは４価の有機基で互いに同一でも異なっても良い。ａ、ｂ、ｃ、ｄはモルパーセントを示しａ＋ｂ＋ｃ＋ｄ＝１００、５０≦ａ＋ｃ≦９５、１０≦ａ＋ｂ≦７５である）
［６］
一般式（２）で示される構造を有するポリアミドイミド樹脂（Ａ）中のＸが、式（３）の群より選ばれてなる［５］記載のポジ型感光性樹脂組成物。

［７］
一般式（２）で示される構造を有するポリアミドイミド樹脂（Ａ）中のＹが、式（４）の群より選ばれてなる［５］または［６］記載のポジ型感光性樹脂組成物。

［８］
一般式（２）で示される構造を有するポリアミドイミド樹脂（Ａ）が、アルケニル基又はアルキニル基を少なくとも１個有する脂肪族基又は環式化合物基を含む誘導体によって末端封止されたものである［５］〜［７］のいずれか１項に記載のポジ型感光性樹脂組成物。
［９］
一般式（２）で示される構造を有するポリアミドイミド樹脂（Ａ）において、Ｘが式（５）の群より選ばれる物質であり、かつＹが式（６）で示される物質であり、かつ式（７）で示される物質により末端封止されたものである［５］〜［８］のいずれか１項に記載のポジ型感光性樹脂組成物。

［１０］
［１］〜［９］のいずれか１項に記載のポジ型感光性樹脂組成物を基板上に塗布して組成物層を形成する工程と、
該組成物層の所望の部分に活性エネルギー線を照射し、次いで現像液と接触させてパターンを形成する工程と、該組成物層を加熱する工程と、を含むことを特徴とするパターン形成方法。
［１１］
半導体基板と、該半導体基板に設けられた半導体素子と、該半導体素子の上部に設けられた絶縁膜とを備え、前記絶縁膜は、［１］〜［９］のいずれかに記載のポジ型感光性樹脂組成物より形成された膜であることを特徴とする半導体装置。
［１２］
表示素子用基板と、その表面を覆う絶縁膜と、前記表示素子用基板の上部に設けられた表示素子とを備え、前記絶縁膜は、［１］〜［９］のいずれかに記載のポジ型感光性樹脂組成物より形成された膜であることを特徴とする発光装置
［１３］
半導体チップとその表面を覆う保護膜とを備える半導体装置の製造方法であって、前記半導体チップ上にポジ型感光性樹脂組成物を塗布して樹脂層を形成する工程と、該樹脂層の所望の部分に活性エネルギー線を照射する工程と、
活性エネルギー線照射後の該樹脂層に現像液を接触させ、次いで該樹脂層を加熱することにより前記保護膜を形成 する工程と、を含み、前記ポジ型感光性樹脂組成物が［１］〜［９］のいずれかに記載のポジ型感光性樹脂組成物 であることを特徴とする半導体装置の製造方法。
［１４］
表示素子用基板とその表面を覆う平坦化膜を備える表示素子の製造方法であって、前記表示素子用基板上にポジ型感光性樹脂組成物を塗布して樹脂層を形成する工程と、該樹脂層の所望の部分に活性エネルギー線を照射する工程と、
活性エネルギー線照射後の該樹脂層に現像液を接触させ、次いで該樹脂層を加熱することにより前記平坦化膜を形成する工程と、を含み、前記ポジ型感光性樹脂組成物が［１］〜［９］のいずれかに記載のポジ型感光性樹脂組成物であることを特徴とする表示素子の製造方法。 Such an object is achieved by the present invention described in the following [1] to [14].
[1]
It includes a polyamideimide resin (A) obtained by reacting a compound represented by the chemical formula (1) with a carboxylic acid, a compound (B) that generates an acid by light, and a compound (C) having a phenolic hydroxyl group. A positive photosensitive resin composition.

[2]
The positive photosensitive resin composition according to [1], wherein (C) is a compound having two or more phenolic hydroxyl groups in the molecule.
[3]
The positive photosensitive resin composition according to [1] or [2], wherein (C) contains either a biphenyl skeleton or a bisphenol skeleton.
[4]
The compound (B) that generates an acid by light is an ester compound of a phenol compound and 1,2-naphthoquinone-2-diazide-5-sulfonic acid or 1,2-naphthoquinone-2-diazide-4-sulfonic acid. The positive photosensitive resin composition according to [1] to [3].
[5]
The positive photosensitive resin composition according to [1] to [4], wherein the polyamideimide resin (A) is a polyamideimide resin having a structure represented by the general formula (2).

(X is a tetravalent organic group which may be the same or different. R ₁ may be a hydrogen atom or an organic group having 1 to 15 carbon atoms and may be the same or different. Y is a tetravalent organic group which is the same. However, a, b, c, and d are mole percentages and a + b + c + d = 100, 50 ≦ a + c ≦ 95, and 10 ≦ a + b ≦ 75)
[6]
The positive photosensitive resin composition according to [5], wherein X in the polyamideimide resin (A) having a structure represented by the general formula (2) is selected from the group of the formula (3).

[7]
The positive photosensitive resin composition according to [5] or [6], wherein Y in the polyamideimide resin (A) having a structure represented by the general formula (2) is selected from the group of the formula (4).

[8]
The polyamideimide resin (A) having the structure represented by the general formula (2) is end-capped with a derivative containing an aliphatic group or a cyclic compound group having at least one alkenyl group or alkynyl group [ The positive photosensitive resin composition according to any one of [5] to [7].
[9]
In the polyamideimide resin (A) having the structure represented by the general formula (2), X is a substance selected from the group of the formula (5), and Y is a substance represented by the formula (6), and the formula The positive photosensitive resin composition according to any one of [5] to [8], which is end-capped with a substance represented by (7).

[10]
Applying the positive photosensitive resin composition according to any one of [1] to [9] onto a substrate to form a composition layer;
A pattern forming method comprising: a step of irradiating a desired portion of the composition layer with active energy rays and then contacting the developer with a developer to form a pattern; and a step of heating the composition layer .
[11]
A semiconductor substrate, a semiconductor element provided on the semiconductor substrate, and an insulating film provided on the semiconductor element, wherein the insulating film is a positive type according to any one of [1] to [9] A semiconductor device comprising a film formed of a photosensitive resin composition.
[12]
A display element substrate, an insulating film covering the surface of the display element substrate, and a display element provided on the display element substrate, wherein the insulating film is a positive electrode according to any one of [1] to [9]. Light-emitting device [13], characterized in that it is a film formed from a type photosensitive resin composition
A method of manufacturing a semiconductor device comprising a semiconductor chip and a protective film covering the surface thereof, the step of applying a positive photosensitive resin composition on the semiconductor chip to form a resin layer, and a desired resin layer Irradiating active energy rays to the part of
Forming a protective film by bringing a developer into contact with the resin layer after irradiation with active energy rays and then heating the resin layer, wherein the positive photosensitive resin composition comprises [1] to [9] A method for producing a semiconductor device, which is the positive photosensitive resin composition according to any one of [9].
[14]
A method for manufacturing a display element comprising a display element substrate and a planarizing film covering the surface thereof, the step of applying a positive photosensitive resin composition on the display element substrate to form a resin layer; and Irradiating active energy rays to a desired portion of the resin layer;
Forming a planarizing film by bringing a developer into contact with the resin layer after irradiation with active energy rays and then heating the resin layer, wherein the positive photosensitive resin composition is [1] A method for producing a display element, which is the positive photosensitive resin composition according to any one of [9].

  The positive photosensitive resin composition of the present invention provides a resin composition that can be thermally cured at a low temperature, has high sensitivity resolution, and has excellent cured film properties such as reflow resistance and solvent resistance. To do.

  The present invention relates to a positive photosensitive composition comprising a specific polyamideimide resin (A), a compound (B) that generates an acid by light, and a compound (C) having a phenolic hydroxyl group. In addition, the specific example shown below is an illustration and this invention is not limited to these at all. Hereinafter, each component of the positive photosensitive resin composition of the present invention will be described in detail.

  Among the polyamideimide resins (A) obtained by reacting the compound represented by the chemical formula (1) and carboxylic acids, specific examples of the carboxylic acid include those represented by the following formula.

  Among these, particularly preferred are those represented by the following formula. Carboxylic acids may be used alone or in combination of two or more.

  In addition, an aminophenol compound other than the compound represented by the chemical formula (1) can be used in combination with the compound represented by the chemical formula (1) as a reaction product with a carboxylic acid. Specific examples of the aminophenol compound include those represented by the following formula.

  Examples of the reaction method of the compound represented by the chemical formula (1) and carboxylic acids include the following methods. The compound represented by the chemical formula (1) is placed in a flask capable of introducing nitrogen together with a solvent such as N-methyl-2-pyrrolidone, and dissolved by stirring. Carboxylic acids are added to this solution and further stirred and dissolved. Thereafter, the temperature of the reaction solution is kept at about 80 to 200 ° C., more preferably 100 to 160 ° C. with stirring, and the reaction is allowed to proceed.

X in the polyamideimide resin containing the structure represented by the general formula (2) represents a tetravalent organic group, and X may be the same or different from each other. The substituent —OR ₁ is for the purpose of adjusting the solubility of the hydroxyl group in an aqueous alkali solution, and R ₁ is a hydrogen atom or an organic group having 1 to 15 carbon atoms. R ₁ may be the same as or different from each other. Examples of R ₁ include formyl group, methyl group, ethyl group, propyl group, isopropyl group, tertiary butyl group, tertiary butoxycarbonyl group, phenyl group, benzyl group, tetrahydrofuranyl group, tetrahydropyranyl group and the like. It is done. Y represents a tetravalent organic group, and Y may be the same as or different from each other. When this polyamideimide resin is heated at about 200 to 400 ° C., the amide structure is dehydrated and closed, and a heat resistant resin is obtained.

  Examples of X of the polyamideimide resin including the structure represented by the general formula (2) of the present invention include those represented by the following formula.

  Among these, particularly preferred are those represented by the following formula, or both may be used.

  Examples of Y of the polyamideimide resin including the structure represented by the general formula (2) include those represented by the following formula.

  Among these, particularly preferred are those represented by the following formula.

In the present invention, it is desirable to seal the end from the viewpoint of storage stability. For sealing, a derivative having an aliphatic group or cyclic compound group having at least one alkenyl group or alkynyl group can be introduced as an acid derivative or amine derivative at the end of the polyamideimide represented by the general formula (2). .
Specifically, after synthesizing a polyamideimide resin having the structure represented by the general formula (2), an aliphatic group having at least one alkenyl group or alkynyl group as a terminal amino group contained in the polyamideimide resin. Alternatively, it is preferable to cap the amide using an acid anhydride or acid derivative containing a cyclic compound group.
Examples of the reaction method for sealing the end of the polyamideimide represented by the general formula (2) include the following methods. A derivative having an aliphatic group having at least one alkenyl group or alkynyl group or a derivative having a cyclic compound group is added to a solution obtained by mixing the compound represented by the chemical formula (1) and a carboxylic acid and causing a reaction by heating. The reaction is allowed to proceed while maintaining the temperature of the reaction solution at 50 to 150 ° C, more preferably 70 to 120 ° C.
Examples of the group derived from an acid anhydride or acid derivative containing an aliphatic group or cyclic compound group that reacts with an amino group and has at least one alkenyl group or alkynyl group include those represented by the following formulae: .

  Among these, particularly preferred are those represented by the following formula.

  The method is not limited to this method, and the terminal acid contained in the polyamideimide resin is converted into an amide using an amine derivative containing an aliphatic group or a cyclic compound group having at least one alkenyl group or alkynyl group. It can also be capped.

  In the general formula (2), (a + c) represents the mole percentage of imide in the resin, and the value thereof is 50 or more and 95 or less. If it is less than 50, the film loss in the unexposed area becomes extremely large at the time of development, swelling and development residue (scum) occur, and pattern processing becomes impossible. On the other hand, if it exceeds 95, the solubility of the resin in the exposed area is extremely lowered, and pattern processing becomes impossible, which is not preferable.

  In the general formula (2), (a + b) represents the mole percentage of the amine derived from 3,3′-diamino-4,4′-dihydroxydiphenylsulfone with respect to the amine in the resin, and the value thereof is 10 or more and 75 or less. When it is less than 10, the tensile strength of the cured film is extremely deteriorated, and when it exceeds 75, the resin solution is gelled.

  Examples of the compound (B) that generates an acid by light used in the present invention include onium salts, halogenated organic compounds, quinonediazide compounds, α, α-bis (sulfonyl) diazomethane compounds, α-carbonyl-α-sulfonyl-diazomethanes. Examples thereof include a system compound, a sulfone compound, an organic acid ester compound, an organic acid amide compound, and an organic acid imide compound. Specific examples of the onium salt include a diazonium salt having an unsubstituted, symmetrically or asymmetrically substituted alkyl group, alkenyl group, aralkyl group, aromatic group, heterocyclic group, ammonium salt, iodonium salt, Examples include sulfonium salts, phosphonium salts, arsonium salts, oxonium salts, and the like. Specific examples of the counter anion of these onium salts are not particularly limited as long as they are compounds capable of forming a counter anion, but boronic acid, arsenic acid, phosphoric acid, antimonic acid, sulfonic acid, carboxylic acid, or these Of the halides. The halogenated organic compound is not particularly limited as long as it is a halide of an organic compound, and various known compounds can be used. Specific examples include halogen-containing oxadiazol compounds, halogen-containing triazine compounds, halogen compounds. -Containing acetophenone compounds, halogen-containing benzophenone compounds, halogen-containing sulfoxide compounds, halogen-containing sulfone compounds, halogen-containing thiazole compounds, halogen-containing oxazole compounds, halogen-containing triazole compounds, halogen-containing 2 -Various compounds such as pyrone compounds, halogen-containing aliphatic hydrocarbon compounds, halogen-containing aromatic hydrocarbon compounds, other halogen-containing heterocyclic compounds, and sulfenyl halide compounds. Further, as halogenated organic compounds, tris (2,3-dibromopropyl) phosphate, tris (2,3-dibromo-3-chloropropyl) phosphate, chlorotetrabromoethane, hexachlorobenzene, hexabromobenzene, hexa Bromocyclododecane, hexabromobiphenyl, tribromophenyl allyl ether, tetrachlorobisphenol A, tetrabromobisphenol A, bis (bromoethyl ether) tetrabromobisphenol A, bis (chloroethyl ether) Ter) tetrachlorobisphenol A, tris (2,3-dibromopropyl) isocyanurate, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4- Hydroxyethoxy-3,5-dibromophenyl) propane, etc. Halogen-containing flame retardant, dichlorodiphenyltrichloroethane, benzenehexachloride, pentachlorophenol, 2,4,6-trichlorophenyl-4-nitrophenyl ether, 2,4-dichlorophenyl-3'-methoxy-4 ' -Nitrophenyl ether, 2,4-dichlorophenoxyacetic acid, 4,5,6,7-tetrachlorofusalide, 1,1-bis (4-chlorophenyl) ethanol, 1,1-bis (4-chlorophenyl) ) -2,2,2-trichloroethanol, ethyl-4,4-dichlorobenzylate, 2,4,5,4'-tetrachlorodiphenyl sulfide, 2,4,5,4'-tetrachloro Organic chloro-based agricultural chemicals such as diphenylsulfone are also included. Specific examples of the quinonediazide compound include 1,2-benzoquinonediazide-4-sulfonic acid ester, 1,2-naphthoquinonediazide-4-sulfonic acid ester, 1,2-naphthoquinonediazide-5-sulfonic acid ester, 1,2 -Naphthoquinonediazide-6-sulfonic acid ester, 2,1-naphthoquinonediazide-4-sulfonic acid ester, 2,1-naphthoquinonediazide-5-sulfonic acid ester, 2,1-naphthoquinonediazide-6-sulfonic acid ester, etc. Sulfonic acid esters of quinonediazide derivatives, 1,2-benzoquinonediazide-4-sulfonic acid chloride, 1,2-naphthoquinonediazide-4-sulfonic acid chloride, 1,2-naphthoquinonediazide-5-sulfonic acid chloride, 1,2 -Naphthoquinonediazide-6 Sulfonic acid chloride, 2,1-naphthoquinonediazide-4-sulfonic acid chloride, 2,1-naphthoquinonediazide-5-sulfonic acid chloride, 2,1-naphthoquinonediazide-6-sulfonic acid chloride, sulfonic acid of other quinone azide derivatives Examples include o-quinone azide compounds such as chloride. Specific examples of α, α-bis (sulfonyl) diazomethane-based compounds include α, α having an unsubstituted, symmetrically or asymmetrically substituted alkyl group, alkenyl group, aralkyl group, aromatic group, and heterocyclic group. α-bis (sulfonyl) diazomethane and the like can be mentioned. Specific examples of the α-carbonyl-α-sulfonyl-diazomethane-based compound include α- having an unsubstituted, symmetrically or asymmetrically substituted alkyl group, alkenyl group, aralkyl group, aromatic group, and heterocyclic group. Examples include carbonyl-α-sulfonyl-diazomethane. Specific examples of the sulfone compound include a sulfone compound having an unsubstituted, symmetrically or asymmetrically substituted alkyl group, alkenyl group, aralkyl group, aromatic group, and heterocyclic group, and a disulfone compound. Specific examples of the organic acid esters include unsubstituted, symmetrically or asymmetrically substituted alkyl groups, alkenyl groups, aralkyl groups, aromatic groups, carboxylic acid esters having a heterocyclic group, and sulfonate esters. It is done. Specific examples of organic acid amides include unsubstituted, symmetrically or asymmetrically substituted alkyl groups, alkenyl groups, aralkyl groups, aromatic groups, carboxylic acid amides having heterocyclic groups, and sulfonic acid amides. It is done. Specific examples of organic acid imides include unsubstituted, symmetrically or asymmetrically substituted alkyl groups, alkenyl groups, aralkyl groups, aromatic groups, carboxylic acid imides having heterocyclic groups, and sulfonic acid imides. It is done. These compounds that can be cleaved by irradiation with actinic rays to generate an acid may be used alone or in combination of two or more.

  Among these, preferred are compounds having a 1,2-benzoquinonediazide or 1,2-naphthoquinonediazide structure, which are known from US Pat. Nos. 2,727,975, 2,797,213 and 3,669,658. For example, the following are mentioned.

式中Ｑは、水素原子、式（８）、式（９）のいずれかから選ばれるものである。ここで各化合物のＱのうち、少なくとも１つは式（８）、式（９）である。

In the formula, Q is selected from a hydrogen atom, formula (8), and formula (9). Here, at least one of Q of each compound is represented by formula (8) or formula (9).

  Furthermore, among these, an ester compound of a phenol compound and 1,2-naphthoquinone-2-diazide-5-sulfonic acid or 1,2-naphthoquinone-2-diazide-4-sulfonic acid is particularly preferable. Examples of the phenol compound include the following. These may be used alone or in combination of two or more.

式中Ｑは、水素原子、式（８）、式（９）のいずれかから選ばれるものである。ここで各化合物のＱのうち、少なくとも１つは式（８）、式（９）である。

In the formula, Q is selected from a hydrogen atom, formula (8), and formula (9). Here, at least one of Q of each compound is represented by formula (8) or formula (9).

  The preferable addition amount of the compound (B) which generates an acid by light used in the present invention is 1 to 50 parts by weight with respect to 100 parts by weight of the alkali-soluble resin. If the amount is less than 1 part by weight, the patterning property of the polyamide-imide resin becomes poor, and if it exceeds 50 parts by weight, the sensitivity is greatly reduced.

  The compound (C) having a phenolic hydroxyl group used in the present invention is preferably a compound containing two or more phenolic hydroxyl groups in one molecule. Moreover, it is preferable that it contains either a biphenyl skeleton or a bisphenol skeleton. In the latter case, a series of derivatives in which a phenolic hydroxyl group, an alkyl group or the like is substituted on the biphenyl skeleton or bisphenol skeleton are also included in this.

Moreover, as a compound (C) which has a phenolic hydroxyl group used by this invention, the compound represented by a following formula is more preferable. In the formula, R represents a divalent aromatic compound such as phenylene or biphenylene. n and m are integers of 0 to 30, and n and m are not 0 at the same time. n + m is 1 or more and less than 60, but preferably 1 or more and less than 10. The order of the repeating units of I and II may be arbitrary, and may be a structure of a block copolymer or a random copolymer. When either n or m is 0, it represents a homopolymer structure.

  Specific examples of the compound (C) having a phenolic hydroxyl group used in the present invention include the following. These may be used alone or in combination of two or more.

  Moreover, the preferable addition amount of the compound (C) which has a phenolic hydroxyl group is 1-150 weight part with respect to 100 weight part of alkali-soluble resin, More preferably, it is 1-100 weight part. If the amount is less than 1 part by weight, the sensitivity at the time of development is lowered, and if it exceeds 150 parts by weight, the film thickness of the unexposed part is significantly reduced at the time of development, or precipitation occurs during frozen storage, resulting in lack of practicality.

  The positive photosensitive resin composition of the present invention may contain a dihydropyridine derivative to enhance the photosensitive characteristics as necessary. Examples of the dihydropyridine derivative include 2,6-dimethyl-3,5-diacetyl-4- (2′-nitrophenyl) -1,4-dihydropyridine, 4- (2′-nitrophenyl) -2,6-dimethyl. -3,5-dicarboethoxy-1,4-dihydropyridine, 4- (2 ', 4'-dinitrophenyl) -2,6-dimethyl-3,5-dicarbomethoxy-1,4-dihydropyridine, etc. be able to.

The positive photosensitive resin composition in the present invention may contain additives such as a leveling agent and a silane coupling agent as necessary.
In the present invention, these components are dissolved in a solvent and used in the form of a varnish. Solvents include N-methyl-2-pyrrolidone, γ-butyrolactone, N, N-dimethylacetamide, dimethyl sulfoxide, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, propylene glycol Monomethyl ether acetate, methyl lactate, ethyl lactate, butyl lactate, methyl-1,3-butylene glycol acetate, 1,3-butylene glycol-3-monomethyl ether, methyl pyruvate, ethyl pyruvate, methyl-3-methoxypropio And the like, and may be used alone or in combination.

  In the method of using the positive photosensitive resin composition of the present invention, first, the resin composition is applied to a suitable support such as a silicon wafer, a ceramic substrate, an aluminum substrate and the like. In the case of a semiconductor device, the coating amount is applied so that the final film thickness after curing is 0.1 to 30 μm. When the film thickness is less than 0.1 μm, it is difficult to sufficiently exert the function as a protective surface film of the semiconductor element, and when it exceeds 30 μm, it is difficult to obtain a fine processed pattern. Application methods include spin coating using a spinner, spray coating using a spray coater, dipping, printing, roll coating, and the like. Next, after prebaking at 60 to 130 ° C. to dry the coating film, actinic radiation is applied to the desired pattern shape. As the actinic radiation, X-rays, electron beams, ultraviolet rays, visible rays and the like can be used, but those having a wavelength of 200 to 500 nm are preferable.

  Next, a relief pattern is obtained by dissolving and removing the irradiated portion with a developer. Developers include inorganic alkalis such as sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, and aqueous ammonia, primary amines such as ethylamine and n-propylamine, diethylamine, and di-n. Secondary amines such as propylamine, tertiary amines such as triethylamine and methyldiethylamine, alcohol amines such as dimethylethanolamine and triethanolamine, quaternary ammonium such as tetramethylammonium hydroxide and tetraethylammonium hydroxide An aqueous solution of an alkali such as a salt, and an aqueous solution to which an appropriate amount of a water-soluble organic solvent such as methanol or ethanol or a surfactant is added can be preferably used. As a developing method, methods such as spraying, paddle, dipping, and ultrasonic waves are possible.

  Next, the relief pattern formed by development is rinsed. Distilled water is used as the rinse liquid. Next, heat treatment is performed to form an imide ring, thereby obtaining a final pattern rich in heat resistance.

  The photosensitive resin composition according to the present invention is useful not only for semiconductor applications but also as interlayer insulation for multilayer circuits, cover coats for flexible copper-clad plates, solder resist films and liquid crystal alignment films, interlayer insulation films for elements in display elements, etc. It is.

  Examples of specific uses for semiconductors include a passivation film obtained by forming the above-described photosensitive resin composition film on a semiconductor element, and a photosensitive resin composition described above on a passivation film formed on a semiconductor element. Examples thereof include a buffer coat film formed by forming a physical film, and an interlayer insulating film formed by forming the above-described photosensitive resin composition film on a circuit formed on a semiconductor element.

  Among them, as one application example in which the photosensitive resin composition of the present invention is used in a semiconductor device, application to a semiconductor device having bumps will be described with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of a pad portion of a semiconductor device having a bump according to the present invention. As shown in FIG. 1, a passivation film 3 is formed on an input / output Al pad 2 in a silicon wafer 1, and a via hole is formed in the passivation film 3. Further, a positive photosensitive resin (buffer coating film) 4 is formed thereon, and a metal (Cr, Ti, etc.) film 5 is formed so as to be connected to the Al pad 2, and the metal film 5 is formed of solder bumps. The periphery of 10 is etched to insulate between the pads. A barrier metal 8 and a solder bump 10 are formed on the insulated pad.

  Examples of display device applications include TFT interlayer insulating films, TFT element flattening films, color filter flattening films, protrusions for MVA liquid crystal display devices, and cathode partitions for organic EL elements. The usage method is based on forming the photosensitive resin composition layer patterned on the board | substrate which formed the display body element and the color filter by said method according to a semiconductor use. High transparency is required for display device applications, especially interlayer insulation films and planarization films, but by introducing a post-exposure process before curing the photosensitive resin composition layer, it is excellent in transparency. A resin layer can be obtained, which is more preferable in practical use.

Hereinafter, the present invention will be described specifically by way of examples.
<Example 1>
3,3′-Diamino-4,4′-dihydroxydiphenylsulfone (hereinafter abbreviated as HAB-S) 41.8 g (0.1490 mol) and 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoro 44.6 g (0.1490 mol) of propane (hereinafter abbreviated as BAFA) and 58.2 g of N-methyl-2-pyrrolidone were equipped with a thermometer, a stirrer, a raw material inlet, and a dry nitrogen gas inlet pipe. In a separable flask, 219.8 g of γ-butyrolactone was added and dissolved. To this mixed solution, 90.6 g (0.2920 mol) of 4,4′-oxydiphthalic anhydride (hereinafter abbreviated as ODPA) was added together with 100 g of γ-butyrolactone, followed by stirring at room temperature for 10 minutes. Then, it was made to react by stirring at 140 degreeC for 2.5 hours using an oil bath. After cooling the temperature of the reaction mixture to 80 ° C., 5.2 g (0.0302 mol) of 5-ethynyl-isobenzofuran-1,3-dione was added together with 30 g of γ-butyrolactone and stirred at 80 ° C. for 2 hours. Then, the reaction is terminated, and is represented by the general formula (2), wherein X is the following formula X-1, Y is the following formula Y-1, and a = 40, b = 10, c = 40, d = 10 A polyamideimide resin (A-1) was synthesized.

Production of Positive Photosensitive Resin Composition 100 g of the synthesized polyamideimide resin (A-1), 16 g of a compound that generates an acid by light represented by the following formula (B-1), and represented by the following formula (C-1) 10 g of a compound having a phenolic hydroxyl group was dissolved in 150 g of γ-butyrolactone and then filtered through a 0.2 μm Teflon (registered trademark) filter to obtain a positive photosensitive resin composition. This was designated Example 1.

Characteristic Evaluation This positive photosensitive resin composition was applied onto a silicon wafer using a spin coater and then pre-baked at 120 ° C. for 4 minutes on a hot plate to obtain a coating film having a thickness of about 7 μm. Through this coating film, a mask made by Toppan Printing Co., Ltd. (test chart No. 1: a remaining pattern and a blanking pattern with a width of 0.88 to 50 μm are drawn), and an i-line stepper (Nikon Corporation 4425i) ) And changed the exposure amount. Next, the exposed portion was dissolved and removed by immersing in a 2.38% tetramethylammonium hydroxide aqueous solution for 110 seconds, and then rinsed with pure water for 10 seconds. As a result, it was confirmed that a pattern was formed from the portion irradiated with an exposure amount of 250 mJ / cm ² . (Sensitivity is 250 mJ / cm ² ). The resolution was 3 μm. Further, curing was performed in a clean oven at 150 ° C./30 minutes, 250 ° C./60 minutes, and an oxygen concentration atmosphere of 10 ppm or less. Next, the obtained cured film was cut into a 10 mm strip with the wafer using a dicing saw, and then immersed in 2% hydrogen fluoride water to obtain a strip-shaped film peeled from the wafer. Next, when the tensile elongation of the strip-like film was measured with a tensile tester, it was 24%.

<Example 2>
In the synthesis of the polyamideimide resin in Example 1, ODPA was reduced to 45.3 g (0.1460 mol), and 4,4 ′-(hexafluoroisopropylidene) diphthalic anhydride (hereinafter abbreviated as 6FDA) instead. 9 g (0.1460 mol) was added, represented by the general formula (2), X is a mixture of the following formulas X-1 and X-2, Y is the following formula Y-1, a = 40, b = 10, A polyamideimide resin (A-2) consisting of c = 40 and d = 10 was synthesized. A positive photosensitive resin composition was prepared in the same manner as in Example 1 except that the polyimide amide resin (A-1) in Example 1 was changed to (A-2). The same evaluation was performed.

<Example 3>
After forming an ITO film on the glass substrate by vapor deposition, the ITO film was divided into stripes by an ordinary photolithography method using a photoresist. On top of this, the positive photosensitive resin composition obtained in Example 1 was applied to form a resin layer having a thickness of about 2 μm. Next, using a parallel exposure machine (light source: high-pressure mercury lamp), exposure was performed through a glass mask at an exposure intensity of 25 mW / cm 2 for 10 seconds. Thereafter, the resin layer was immersed and developed in a 2.38% tetramethylammonium hydroxide aqueous solution for 20 seconds to expose portions other than the ITO edge on each stripe, and the ITO edge portion and the ITO removed portion were exposed. Processing was performed so that the resin layer was formed only on the top. Thereafter, the entire resin layer was subjected to post-exposure for 40 seconds at an exposure intensity of 25 mW / cm 2 using the parallel exposure machine used for exposure, and then 1 hour at 230 ° C. in air using a hot air circulation dryer. Heat curing was performed.

  After depositing copper phthalocyanine as a hole injection layer and bis-N-ethylcarbazole as a hole transport layer on this substrate under a reduced pressure of 1 × 10 −4 Pa or less, N, N′-diphenyl- N, N′-m-toluyl-4,4′-diamino-1,1′-biphenyl and tris (8-quinolinolate) aluminum were deposited in this order as an electron injection layer. Further, after an aluminum layer is deposited on the second electrode as a second electrode, the aluminum layer is formed into a stripe shape in a direction perpendicular to the stripe of the ITO film by a normal photolithography method using a photoresist. Divided. After the obtained substrate was dried under reduced pressure, the sealing glass plate was bonded using an epoxy adhesive to produce a display element. This display element was treated at 80 ° C. for 200 hours and then applied to both electrodes to drive sequentially. However, the element emitted light without any problem.

<Comparative Example 1>
In the production of the positive photosensitive resin composition in Example 1, a positive photosensitive resin composition was produced in the same manner as in Example 1 except that C-1 was not added. Evaluation similar to Example 1 was performed.

<Comparative example 2>
In the synthesis of polyamideimide resin in Example 1, a positive photosensitive resin composition was prepared in the same manner as in Example 1 except that BAFA was increased to 109.1 g (0.2980 mol) without using HAB-S. And this was made into the comparative example 2, and evaluation similar to Example 1 was performed.

<Comparative Example 3>
In the synthesis of polyamideimide resin in Example 2, a positive photosensitive resin composition was prepared in the same manner as in Example 2 except that BAFA was increased to 109.1 g (0.2980 mol) without using HAB-S. And this was made into the comparative example 3, and evaluation similar to Example 1 was performed.

  Note that Comparative Example 1 and 2 correspond to Example 1, and Comparative Example 3 corresponds to Example 2.

  The examples had no problem in terms of sensitivity and tensile elongation. However, in Comparative Example 1, the tensile elongation was good but the sensitivity was poor, and in Comparative Examples 2 and 3, the value of tensile elongation was small. From the above, C-1 was effective in improving sensitivity, and HAB-S was effective in improving tensile elongation.

  The structures of X-1 to X-2, Y-1, B-1, and C-1 of Examples 1-2 and Comparative Examples 1-3 are shown below.

式中Ｑは水素原子又は式（８）を示し、Ｑ全体の内、８８％が（８）である。

In the formula, Q represents a hydrogen atom or formula (8), and 88% of the whole Q is (8).

  The positive photosensitive resin composition of the present invention is capable of thermosetting at low temperatures, has high sensitivity resolution, and has properties such as cured film properties such as reflow resistance and solvent resistance. It is preferably used for a surface protective film of a semiconductor element, an interlayer insulating film, an insulating film of a display element, and the like.

FIG. 1 is a cross-sectional view of a resin-encapsulated semiconductor device having a LOC structure of the present invention.

Explanation of symbols

1 Silicon wafer 2 Al pad 3 Passivation film 4 Buffer coat film 5 Metal (Cr, Ti, etc.) film 6 Wiring (Al, Cu, etc.)
7 Insulating film 8 Barrier metal 9 Solder bump

Claims (14)

(A) a polyamideimide resin obtained by reacting a compound represented by the chemical formula (1) with a carboxylic acid,
(B) a compound that generates an acid by light, and
A positive photosensitive resin composition comprising (C) a compound having a phenolic hydroxyl group.

The positive photosensitive resin composition according to claim 1, wherein the compound (C) is a compound having two or more phenolic hydroxyl groups in the molecule. The positive photosensitive resin composition according to claim 1 or 2, wherein the compound (C) contains either a biphenyl skeleton or a bisphenol skeleton.   The compound (B) that generates an acid by light is an ester compound of a phenol compound and 1,2-naphthoquinone-2-diazide-5-sulfonic acid or 1,2-naphthoquinone-2-diazide-4-sulfonic acid. The positive photosensitive resin composition according to claim 1. The positive photosensitive resin composition according to claim 1, wherein the polyamideimide resin (A) is a polyamideimide resin having a structure represented by the general formula (2).

(X is a tetravalent organic group which may be the same or different. R ₁ may be a hydrogen atom or an organic group having 1 to 15 carbon atoms and may be the same or different. Y is a tetravalent organic group which is the same. However, a, b, c, and d are mole percentages and a + b + c + d = 100, 50 ≦ a + c ≦ 95, and 10 ≦ a + b ≦ 75) The positive photosensitive resin composition according to claim 5, wherein X in the polyamideimide resin (A) having a structure represented by the general formula (2) is selected from the group of the formula (3).

The positive photosensitive resin composition according to claim 5 or 6, wherein Y in the polyamideimide resin (A) having a structure represented by the general formula (2) is selected from the group of the formula (4).

  The polyamideimide resin (A) having the structure represented by the general formula (2) is end-capped with a derivative containing an aliphatic group or a cyclic compound group having at least one alkenyl group or alkynyl group. Item 8. The positive photosensitive resin composition according to any one of Items 5 to 7. In the polyamideimide resin (A) having the structure represented by the general formula (2), X is a substance selected from the group of the formula (5), and Y is a substance represented by the formula (6), and the formula The positive photosensitive resin composition according to any one of claims 5 to 8, which is end-capped with a substance represented by (7).

Applying the positive photosensitive resin composition according to any one of claims 1 to 9 on a substrate to form a composition layer;
A pattern forming method comprising: a step of irradiating a desired portion of the composition layer with active energy rays and then contacting the developer with a developer to form a pattern; and a step of heating the composition layer .   10. A positive photosensitive film according to claim 1, comprising: a semiconductor substrate; a semiconductor element provided on the semiconductor substrate; and an insulating film provided on the semiconductor element. A semiconductor device comprising a film formed from a resin composition.   A positive photosensitive film according to claim 1, comprising a display element substrate, an insulating film covering the surface of the display element substrate, and a display element provided on the display element substrate. Light emitting device characterized in that it is a film formed from a conductive resin composition A method of manufacturing a semiconductor device comprising a semiconductor chip and a protective film covering the surface thereof, the step of applying a positive photosensitive resin composition on the semiconductor chip to form a resin layer, and a desired resin layer Irradiating active energy rays to the part of
Forming a protective film by bringing a developer into contact with the resin layer after irradiation with active energy rays and then heating the resin layer, wherein the positive photosensitive resin composition comprises: 10. A method for producing a semiconductor device, which is the positive photosensitive resin composition according to any one of 9 above. A display element manufacturing method comprising a display element substrate and a planarizing film covering the surface thereof, the step of applying a positive photosensitive resin composition on the display element substrate to form a resin layer; and Irradiating active energy rays to a desired portion of the resin layer;
And a step of bringing the developer layer into contact with the resin layer after irradiation with active energy rays and then heating the resin layer to form the planarizing film, wherein the positive photosensitive resin composition comprises: A method for producing a display element, which is the positive photosensitive resin composition according to any one of items 1 to 9.

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