JP7131984B2 - パターン形成材料、パターン形成方法および半導体装置の製造方法 - Google Patents
パターン形成材料、パターン形成方法および半導体装置の製造方法 Download PDFInfo
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- JP7131984B2 JP7131984B2 JP2018121618A JP2018121618A JP7131984B2 JP 7131984 B2 JP7131984 B2 JP 7131984B2 JP 2018121618 A JP2018121618 A JP 2018121618A JP 2018121618 A JP2018121618 A JP 2018121618A JP 7131984 B2 JP7131984 B2 JP 7131984B2
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- acrylate
- methacrylate
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- polymer
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- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 122
- 125000000524 functional group Chemical group 0.000 claims description 23
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- 238000004057 DFT-B3LYP calculation Methods 0.000 description 1
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 1
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- 125000001309 chloro group Chemical group Cl* 0.000 description 1
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- SSJXIUAHEKJCMH-UHFFFAOYSA-N cyclohexane-1,2-diamine Chemical compound NC1CCCCC1N SSJXIUAHEKJCMH-UHFFFAOYSA-N 0.000 description 1
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- 238000000354 decomposition reaction Methods 0.000 description 1
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- 230000005593 dissociations Effects 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- PWSKHLMYTZNYKO-UHFFFAOYSA-N heptane-1,7-diamine Chemical compound NCCCCCCCN PWSKHLMYTZNYKO-UHFFFAOYSA-N 0.000 description 1
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- 239000010445 mica Substances 0.000 description 1
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- 125000002950 monocyclic group Chemical group 0.000 description 1
- LSHROXHEILXKHM-UHFFFAOYSA-N n'-[2-[2-[2-(2-aminoethylamino)ethylamino]ethylamino]ethyl]ethane-1,2-diamine Chemical compound NCCNCCNCCNCCNCCN LSHROXHEILXKHM-UHFFFAOYSA-N 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- SXJVFQLYZSNZBT-UHFFFAOYSA-N nonane-1,9-diamine Chemical compound NCCCCCCCCCN SXJVFQLYZSNZBT-UHFFFAOYSA-N 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 150000008442 polyphenolic compounds Chemical class 0.000 description 1
- 235000013824 polyphenols Nutrition 0.000 description 1
- 150000003141 primary amines Chemical class 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001226 reprecipitation Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229940014800 succinic anhydride Drugs 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
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- JTJFQBNJBPPZRI-UHFFFAOYSA-J vanadium tetrachloride Chemical compound Cl[V](Cl)(Cl)Cl JTJFQBNJBPPZRI-UHFFFAOYSA-J 0.000 description 1
Images
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- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
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- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
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Description
半導体装置の製造工程において、被加工膜をアスペクト比の高いパターンに加工する技術が望まれている。被加工膜は、被加工膜上に形成されたマスクパターンをマスクとして、ドライエッチング等により加工される。その際、マスクパターンは長時間エッチングガス等に曝される。このため、エッチング耐性の高いマスクパターンが得られるパターン形成材料の開発が望まれる。
本発明者らは、ある種のポリマーをメタライズすることができることを見出した。そして、メタライズされたポリマーは高いエッチング耐性を示した。ポリマーのメタライズとは、ある種の金属をポリマー中に含浸させることである。
ここで、密度汎関数法により求めた安定化エネルギーΔEと、吸着によるメタライズの度合いとの相関を確認した。
次に、側鎖の構造の違いによるTMAの安定化エネルギーΔEの違いについて検討する。
上述したように、TMA等のプレカーサがポリマーの側鎖に含まれるカルボニル基に吸着する。このことから、側鎖内のカルボニル基の密度を高めることで、より多くのプレカーサを吸着することができる可能性がある。
上記のように、ポリマーの側鎖に複数のカルボニル基が存在する場合、カルボニル基の位置や周辺環境によってプレカーサの吸着特性が変わることが判った。
ポリマー及びその側鎖の構造だけでなく、プレカーサの種類によっても吸着特性は異なると考えられる。例えば、プレカーサが他の金属原子を有するような場合である。
上述の各種検討結果から、メタライズに好適なポリマーとして幾つかの特徴を挙げることができる。すなわち、ポリマーを構成するモノマーユニットが、(メタ)アクリル酸エステル骨格からなることが好ましい。また、かかるモノマーユニット中に、エステル骨格を含め複数のカルボニル基を有することが好ましい。また、複数のカルボニル基のうち、主鎖から最も離れたカルボニル基が直鎖上に存在していることが好ましい。
次に、実施形態について図面を用いて説明する。
実施形態のパターン形成材料は、2種類以上のモノマーユニットからなるポリマーを含む。かかるモノマーユニットのうち、第1のモノマーユニットは複数のカルボニル基を備える。第2のモノマーユニットは側鎖の末端に架橋性官能基を備える。
次に、図10~図12を用い、実施形態の半導体装置の製造処理としてのパターン形成処理について説明する。図10~図12は、実施形態にかかるパターン形成処理の手順の一例を示すフロー図である。本実施形態においては、半導体基板10に形成された被加工膜20を加工するために、パターン形成材料31からマスク膜32を形成する。マスク膜32上には、マスク膜32にパターニングを施す機能膜としてSOG(Spin On Glass)膜40をさらに形成する。
次に、実施例について説明する。
架橋性官能基を有するモノマーユニットのポリマー中の存在比と、かかるポリマーの有機溶剤に対する溶解性、及び、メタライズ特性と、を調べた。
好適な架橋性モノマーユニットの存在比を有するポリマーを用い、溶媒耐性、メタライズ特性、及びエッチング耐性を調べた。
A.モノマーM1~M5のうち、「R」が水素(H)であるもの、及びメチル(CH3)基であるもの1種類ずつを0.98mmol
B.架橋性官能基を有する架橋性モノマーGAA、GMA、4HBAGE、4HBMGE、3E3OMAA、3E3OMMAの1種類ずつを0.02mmol
・有機反応試剤としてのアゾビスイソブチロニトリル0.01mmol
実施例2の参照例として、以下の調査を行った。
Claims (5)
- 2種類以上のモノマーユニットからなるポリマーを含むパターン形成材料であって、
前記モノマーユニットのうち第1のモノマーユニットは、第1のカルボニル基を有するエステル骨格と、前記エステル骨格に結合する1つ以上の第2のカルボニル基と、を備え、
前記第2のカルボニル基のうち前記パターン形成材料を構成する前記ポリマーの主鎖から最も離れた第2のカルボニル基が直鎖上に存在しており、
前記モノマーユニットのうち第2のモノマーユニットは、側鎖の末端に架橋性官能基を備え、
前記第1のモノマーユニットは、
アセトニルメタクリレート,アセトニルアクリレート、アセトアセチルオキシエチルメタクリレート、アセトアセチルオキシエチルアクリレート、アセチルアクリル酸無水物、アセチルメタクリル酸無水物、2-アセトアセチルメタクリレート、2-アセトアセチルアクリレート、2,4-ジオキソペンチルメタクリレート、及び2,4-ジオキソペンチルアクリレートのうちの少なくとも1つであり、
前記第2のモノマーユニットは、
グリシジルアクリレート、グリシジルメタクリレート、4-ヒドロキシブチルアクリレートグリシジルエーテル、4-ヒドロキシブチルメタクリレートグリシジルエーテル、(3-エチル-3-オキセタニル)メチルアクリレート、及び(3-エチル-3-オキセタニル)メチルメタクリレートのうちの少なくとも1つであり、
前記第2のモノマーユニットの存在比率は、前記ポリマーを構成する前記モノマーユニット全体に対して0.5mol%以上20mol%未満である、
パターン形成材料。 - 前記第1及び第2のカルボニル基の少なくともいずれかは、アルミニウム、チタン、タングステン、バナジウム、ハフニウム、ジルコニウム、タンタル、もしくはモリブデンを含む、有機金属化合物またはハロゲン化物に前記ポリマーを曝露して酸化し、金属化合物を析出させる反応におけるメタル配位ポイントである、
請求項1に記載のパターン形成材料。 - 1‐ブタノール、N・N‐ジメチルホルムアミド、N-メチルピロリドン、γーブチロラクトン、アセトン、アニソール、イソブチルアルコール、イソプロピルアルコール、イソペンチルアルコール、エチレングリコールモノエチルエーテル、エチレングリコールモノエチルエーテルアセテート、エチレングリコールモノ-ノルマル-ブチルエーテル、エチレングリコールモノメチルエーテル、エチレングリコールモノメチルエーテルアセテート、キシレン、クレゾール、シクロヘキサノール、シクロヘキサノン、テトラヒドロフラン、トルエン、乳酸エチル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノエチルエーテルアセテート、プロピレングリコールモノ-ノルマル-ブチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテルアセテート、メチルエチルケトン、メチルシクロヘキサノール、メチルシクロヘキサノン、メチル-ノルマル-ブチルケトン、酢酸イソブチル、酢酸イソプロピル、酢酸イソペンチル、酢酸エチル、酢酸ノルマル-ブチル、酢酸ノルマル-プロピル、及び酢酸ノルマル-ペンチルの少なくとも1つを溶媒とする溶液である、
請求項1または請求項2に記載のパターン形成材料。 - 半導体基板上にパターン形成材料からなる膜を形成する膜形成ステップと、
前記膜をパターニングしてマスクパターンを形成するマスクパターン形成ステップと、を含み、
前記パターン形成材料は、
2種類以上のモノマーユニットからなるポリマーを含むパターン形成材料であって、
前記モノマーユニットのうち第1のモノマーユニットは、第1のカルボニル基を有するエステル骨格と、前記エステル骨格に結合する1つ以上の第2のカルボニル基と、を備え、
前記第2のカルボニル基のうち前記パターン形成材料を構成する前記ポリマーの主鎖から最も離れた第2のカルボニル基が直鎖上に存在しており、
前記モノマーユニットのうち第2のモノマーユニットは、側鎖の末端に架橋性官能基を備え、
前記第1のモノマーユニットは、
アセトニルメタクリレート,アセトニルアクリレート、アセトアセチルオキシエチルメタクリレート、アセトアセチルオキシエチルアクリレート、アセチルアクリル酸無水物、アセチルメタクリル酸無水物、2-アセトアセチルメタクリレート、2-アセトアセチルアクリレート、2,4-ジオキソペンチルメタクリレート、及び2,4-ジオキソペンチルアクリレートのうちの少なくとも1つであり、
前記第2のモノマーユニットは、
グリシジルアクリレート、グリシジルメタクリレート、4-ヒドロキシブチルアクリレートグリシジルエーテル、4-ヒドロキシブチルメタクリレートグリシジルエーテル、(3-エチル-3-オキセタニル)メチルアクリレート、及び(3-エチル-3-オキセタニル)メチルメタクリレートのうちの少なくとも1つであり、
前記マスクパターン形成ステップでは、
前記膜をパターニングした後に、気相中で金属含有流体に前記マスクパターンを曝露し、前記マスクパターンを酸化剤で処理する、
パターン形成方法。 - 半導体基板上にパターン形成材料からなる膜を形成する膜形成ステップと、
前記膜をパターニングしてマスクパターンを形成するマスクパターン形成ステップと、を含み、
前記パターン形成材料は、
2種類以上のモノマーユニットからなるポリマーを含むパターン形成材料であって、
前記モノマーユニットのうち第1のモノマーユニットは、第1のカルボニル基を有するエステル骨格と、前記エステル骨格に結合する1つ以上の第2のカルボニル基と、を備え、
前記第2のカルボニル基のうち前記パターン形成材料を構成する前記ポリマーの主鎖から最も離れた第2のカルボニル基が直鎖上に存在しており、
前記モノマーユニットのうち第2のモノマーユニットは、側鎖の末端に架橋性官能基を備え、
前記第1のモノマーユニットは、
アセトニルメタクリレート,アセトニルアクリレート、アセトアセチルオキシエチルメタクリレート、アセトアセチルオキシエチルアクリレート、アセチルアクリル酸無水物、アセチルメタクリル酸無水物、2-アセトアセチルメタクリレート、2-アセトアセチルアクリレート、2,4-ジオキソペンチルメタクリレート、及び2,4-ジオキソペンチルアクリレートのうちの少なくとも1つであり、
前記第2のモノマーユニットは、
グリシジルアクリレート、グリシジルメタクリレート、4-ヒドロキシブチルアクリレートグリシジルエーテル、4-ヒドロキシブチルメタクリレートグリシジルエーテル、(3-エチル-3-オキセタニル)メチルアクリレート、及び(3-エチル-3-オキセタニル)メチルメタクリレートのうちの少なくとも1つであり、
前記マスクパターン形成ステップでは、
前記膜をパターニングした後に、気相中で金属含有流体に前記マスクパターンを曝露し、前記マスクパターンを酸化剤で処理する、
半導体装置の製造方法。
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