JP6573876B2 - 空隙形成用組成物、その組成物を用いて形成された空隙を具備した半導体装置、およびその組成物を用いた半導体装置の製造方法 - Google Patents
空隙形成用組成物、その組成物を用いて形成された空隙を具備した半導体装置、およびその組成物を用いた半導体装置の製造方法 Download PDFInfo
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- JP6573876B2 JP6573876B2 JP2016523501A JP2016523501A JP6573876B2 JP 6573876 B2 JP6573876 B2 JP 6573876B2 JP 2016523501 A JP2016523501 A JP 2016523501A JP 2016523501 A JP2016523501 A JP 2016523501A JP 6573876 B2 JP6573876 B2 JP 6573876B2
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Description
下記式(1):
Ar1、Ar2、およびAr2’はそれぞれ独立に、1個以上のベンゼン環を含む芳香族基であり、前記芳香族基はアルキル、アリール、アルコキシ、ニトロ、アミド、ジアルキルアミノ、スルホンアミド、イミド、カルボキシ、スルホン酸エステル、アルキルアミノ、およびアリールアミノからなる群から選択される置換基で置換されていてもよく、
L1〜L2はそれぞれ独立に、酸素、硫黄、アルキレン、スルホン、イミド、カルボニルもしくは下記一般式(3):
Ar3は1個以上のベンゼン環を含む芳香族基であり、前記芳香族基はアルキル、アリール、アルコキシ、ニトロ、アミド、ジアルキルアミノ、スルホンアミド、イミド、カルボキシ、スルホン酸エステル、アルキルアミノ、およびアリールアミノからなる群から選択される置換基で置換されていてもよく、
L3は窒素、ホウ素、およびリンからなる群から選択される3価原子である。}からなる群から選択される。]
で表される少なくとも1種の繰り返し単位を5つ以上含むポリマーと、
溶剤と、
を含んでいることを特徴とするものである。
本発明は空隙形成用組成物に関するものである。ここで、空隙形成用組成物とは、半導体装置の製造過程などにおいて、基板の金属配線間などに空隙を形成させるための組成物である。より具体的には、基板表面の空隙や空孔などを充填することができ、その後一定の温度以下では安定であり、一定の温度を超えると気化などにより容易に除去できるという性質を有するものである。
この空隙形成用組成物は、特定のポリマーと溶剤とを含んでなる。この特定のポリマーは、
下記式(1):
下記式(2):
Ar1、Ar2、およびAr2’はそれぞれ独立に、1個以上のベンゼン環を含む芳香族基であり、前記芳香族基はアルキル、アリール、アルコキシ、ニトロ、アミド、ジアルキルアミノ、スルホンアミド、カルボキシ、スルホン酸エステル、アルキルアミノ、およびアリールアミノからなる群から選択される置換基で置換されていてもよく、
L1およびL2はそれぞれ独立に、酸素、硫黄、アルキレン、スルホン、イミド、カルボニルもしくは下記一般式(3):
Ar3は1個以上のベンゼン環を含む芳香族基であり、前記芳香族基はアルキル、アリール、アルコキシ、ニトロ、アミド、ジアルキルアミノ、スルホンアミド、イミド、カルボキシ、スルホン酸エステル、アルキルアミノ、およびアリールアミノからなる群から選択される置換基で置換されていてもよく、
L3は窒素、ホウ素、およびリンからなる群から選択される3価原子である。}からなる群から選択される。]
で表される少なくとも1種の繰り返し単位を含むものである。このポリマーは、前記の繰り返し単位を5つ以上含んでいる。また、繰り返し単位を2種類以上含む場合には、繰り返し単位をランダムに含むランダムポリマーであっても、各繰り返し単位のブロックを含むブロックコポリマーであってもよい。また、このポリマーは、本発明の効果を損なわない範囲で前記した繰り返し単位とは異なる繰り返し単位を含んでいてもよい。
本発明による配線間の空隙形成方法および半導体装置の製造方法は、あらかじめ形成されていた空隙、空孔、溝、凹部などを有する材料を、半導体装置の製造過程において保護するものである。本発明においては、このような材料を総称して多孔質材料という。本発明を適用しようとする低誘電率材料の多くは複数の空孔を有する多孔質材料である。すなわち、そのような多孔質材料は密度が低いために、たとえばドライエッチング処理などを施すと、物理的または化学的に損傷を受けやすい。また、材料中に空孔が含まれる材料は、その表面に空孔に起因する凹部などが散在するが、その縁部は平坦部分に比較して、物理的または化学的に損傷を受けやすい。本発明による第二の方法は、そのような損傷を防止するものである。このような方法を図面を参照しながら説明すると以下の通りである。
ゲル・パーミエーション・クロマトグラフィー(GPC)により、ポリマーの数平均分子量(Mn)、質量平均分子量(Mw)および分子量分布(Mw/Mn)を、ポリスチレン換算値として測定した。
[重量減少]
窒素雰囲気中もしくは空気中、重量測定法(TG)により、20℃/minで昇温し、400℃で1時間加熱した際の重量変化と600℃で1時間加熱した際の重量変化をそれぞれ測定した。
[多孔質SiO2へのポリマー組成物の埋め込みおよび空隙形成の確認]
分光エリプソメーターにより、波長633nmにおける屈折率の変化によりポリマーの埋め込みと空隙形成の有無を確認した。
(ポリ−4−メチルトリフェニルアミン(ポリマーP1)の合成)
撹拌器、凝縮器、加熱装置、窒素導入管および温度制御装置を取り付けた反応器に窒素雰囲気下において塩化鉄(III)(無水)(519部)、クロロホルム(4330部)を加え、反応温度を50℃に保持した。その後、クロロホルム(440部)に溶解させた4−メチルトリフェニルアミン(212部)を加えて攪拌した。その後、反応温度を50℃に保持して0.5時間反応させた。
GPC(テトラヒドロフラン)により分子量を測定したところ、数平均分子量Mn=2170Da、質量平均分子量Mw=3991Da、分子量分布(Mw/Mn)=1.84であった。
(ポリ−4−メチルトリフェニルアミン(ポリマーP2)の合成)
反応時間を0.5時間から1時間に変えた以外は合成例1と同様に行ったところ、ポリマーP2を87部(収率:41%)得た。GPC(クロロホルム)により分子量を測定したところ、数平均分子量Mn=3157Da、質量平均分子量Mw=6030Da、分子量分布(Mw/Mn)=1.91であった。
ポリマーP1(10部)にシクロヘキサノン(275部)を添加し、室温で30分間撹拌して、空隙形成用組成物を調製した。
空隙形成用組成物の各成分を、表1に示す通りに変更したほかは実施例1と同様にして、実施例2〜7および比較例1〜2の組成物を調製し、評価した。得られた結果は表1に示す通りであった。
101 空隙形成用組成物
101A 犠牲領域
103 溝構造
104 空隙
Claims (8)
- 半導体装置の製造において、多孔質材料の空孔、溝、または凹部に充填して犠牲領域を形成させ、その後に除去することによって、前記材料の形状を保護するための犠牲領域形成用組成物であって、
下記式(1):
Ar1、Ar2、およびAr2’はそれぞれ独立に、1個以上のベンゼン環を含む芳香族基であり、前記芳香族基はアルキル、およびアルコキシからなる群から選択される置換基で置換されていてもよく、
L1〜L2はそれぞれ独立に、酸素、アルキレン、スルホン、および下記一般式(3):
Ar3は1個以上のベンゼン環を含む芳香族基であり、前記芳香族基はアルキル、およびアルコキシからなる群から選択される置換基で置換されていてもよく、
L3は窒素、およびホウ素からなる群から選択される3価原子である。}からなる群から選択される。]
で表される少なくとも1種の繰り返し単位を5つ以上含み、質量平均分子量が1,000〜1,000,000であるポリマーと、
溶剤と、
を含んでなることを特徴とする犠牲領域形成用組成物。 - 前記Ar1、Ar2、およびAr2’がベンゼン環を1個含む芳香族基である、請求項1に記載の犠牲領域形成用組成物。
- 前記ポリマーの含有率が、組成物の総質量を基準として0.2〜20質量%である、請求項1または2に記載の犠牲領域形成用組成物。
- 前記ポリマーを、不活性ガス雰囲気中または空気中、400℃で1時間加熱した際の重量減少が5%以下、かつ600℃で1時間加熱した際の重量減少が80%以上である請求項1〜3に記載の犠牲領域形成用組成物。
- 複数の空孔を有する多孔質材料を具備してなる半導体装置を製造する方法であって、
前記多孔質材料に、請求項1〜4のいずれか1項に記載の犠牲領域形成用組成物を塗布して前記組成物を前記空孔中に充填し、
前記組成物に含まれる溶媒の一部またはすべてを蒸発させて犠牲材料からなる犠牲領域を形成させ、
前記多孔質材料の表面に凹部を形成させ、
前記凹部に金属材料を充填して金属配線を形成させ、
前記犠牲材料を選択的に除去することによって、前記犠牲領域を中空状態に戻す工程を含むことを特徴とする、半導体装置の製造方法。 - 前記多孔質材料の空孔率が5〜70%である、請求項5に記載の方法。
- 前記犠牲材料の除去が、加熱により犠牲材料を分解させて除去する方法、プラズマ処理によって除去する方法、犠牲材料を溶解する溶媒によって溶解させて除去する方法、高エネルギー線を照射して除去する方法のいずれかにより行われる、請求項5または6に記載の方法。
- 請求項5〜7のいずれか1項に記載の方法により製造されたことを特徴とする半導体装置。
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2015
- 2015-05-26 CN CN201580028112.0A patent/CN106471057A/zh active Pending
- 2015-05-26 SG SG11201609064XA patent/SG11201609064XA/en unknown
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- 2015-05-26 US US15/313,670 patent/US10435555B2/en not_active Expired - Fee Related
- 2015-05-26 KR KR1020167036775A patent/KR20170013939A/ko unknown
- 2015-05-26 EP EP15800354.1A patent/EP3150668A4/en not_active Withdrawn
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EP3150668A4 (en) | 2018-01-17 |
SG11201609064XA (en) | 2016-12-29 |
IL248722A0 (en) | 2017-01-31 |
KR20170013939A (ko) | 2017-02-07 |
US10435555B2 (en) | 2019-10-08 |
US20170210896A1 (en) | 2017-07-27 |
TW201607986A (zh) | 2016-03-01 |
EP3150668A1 (en) | 2017-04-05 |
CN106471057A (zh) | 2017-03-01 |
WO2015182581A1 (ja) | 2015-12-03 |
JPWO2015182581A1 (ja) | 2017-04-20 |
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