KR102512675B1 - 연마 패드, 연마 패드의 제조 방법 및 이를 이용한 반도체 소자의 제조 방법 - Google Patents
연마 패드, 연마 패드의 제조 방법 및 이를 이용한 반도체 소자의 제조 방법 Download PDFInfo
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- KR102512675B1 KR102512675B1 KR1020200187473A KR20200187473A KR102512675B1 KR 102512675 B1 KR102512675 B1 KR 102512675B1 KR 1020200187473 A KR1020200187473 A KR 1020200187473A KR 20200187473 A KR20200187473 A KR 20200187473A KR 102512675 B1 KR102512675 B1 KR 102512675B1
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Abstract
또한, 본 발명은 상기 연마 패드를 적용한 반도체 소자의 제조 방법을 제공할 수 있다.
Description
도 2는 본 발명의 일 실시예에 따른 부피 누적 직경에 대한 그래프이다.
도 3은 본 발명의 일 실시예에 따른 연마면 및 반도체 기판의 접촉 피크 수를 나타내는 도면이다.
도 4는 본 발명의 일 실시예에 따른 연마층의 제조 시 포함되는 고상 발포제에 개념도이다.
도 5는 본 발명의 일 실시예에 따른 연마층의 제조 시, 고상 발포제의 발포에 관한 개념도이다.
도 6은 본 발명의 일 실시예에 따른 반도체 소자 제조 공정의 개략적인 공정도이다.
도 7은 본 발명의 일 실시예에 따른 연마층의 기공에 관한 SEM 측정 결과이다.
도 8은 본 발명의 일 실시예에 따른 연마층의 기공에 관한 SEM 측정 결과이다.
도 9는 본 발명의 일 실시예에 따른 연마층의 기공에 관한 SEM 측정 결과이다.
도 10은 본 발명의 일 실시예에 따른 연마층의 기공에 관한 SEM 측정 결과이다.
도 11는 본 발명의 일 실시예에 따른 연마면에 대한 연마 공정 후의 SEM 측정 결과이다.
도 12은 본 발명의 일 실시예에 따른 연마면에 대한 연마 공정 후의 SEM 측정 결과이다.
도 13는 본 발명의 일 실시예에 따른 연마면에 대한 연마 공정 후의 SEM 측정 결과이다.
도 14는 본 발명의 일 실시예에 따른 연마면에 대한 연마 공정 후의 SEM 측정 결과이다.
도 15은 본 발명의 일 실시예에 따른 연마면에 대한 연마 공정 후의 SEM 측정 결과이다.
도 16은 본 발명의 일 실시예에 따른 연마면에 대한 연마 공정 후의 SEM 측정 결과이다.
도 17는 본 발명의 일 실시예에 따른 연마면에 대한 연마 공정 후의 SEM 측정 결과이다.
도 18은 본 발명의 일 실시예에 따른 연마면에 대한 연마 공정 후의 SEM 측정 결과이다.
구분 | 실시예 1 | 실시예 2 | 비교예 1 | 비교예 2 | 비교예 3 | |
Top Pad | Prepolymer의 NCO 함량(%) | 8% | 8% | 8% | 8% | 8% |
Casting mold Type | 낱매 | 낱매 | 낱매 | 낱매 | 낱매 | |
촉매사용량 | 0.002 중량부 | 0.001 중량부 |
X | 0.002 중량부 |
0.05 중량부 |
|
사용 고상발포제 | 551DU40 (Unexpanded) |
551DU40 (Unexpanded) |
551DU40 (Unexpanded) |
461DET40d25 (Expanded) |
551DU40 (Unexpanded) |
|
sheet 가공 (casting, 절삭, Groove) | 순차적 | 순차적 | 순차적 | 순차적 | 순차적 | |
Prepolymer 중량부 | 100 | 100 | 100 | 100 | 100 | |
고상발포제 중량부 | 1 내지 5 | 1 내지 5 | 1 내지 5 | 1 내지 5 | 1 내지 5 | |
캐스팅 (Casting) |
Gel Time(sec) | 80 | 88 | 80 | 80 | 28 (캐스팅 불가) |
구 분 | 평가 항목 | 실시예 1 | 실시예 2 | 비교예 1 | 비교예 2 | 비교예 3 | |
물성 | Top pad |
두께 (mm) | 2 | 2 | 2 | 2 | 캐스팅 불가 물성 측정 불가 |
경도 (Shore D) | 57.8 | 58.2 | 57.5 | 58.5 | |||
비중(g/cc) | 0.78 | 0.78 | 0.78 | 0.78 | |||
인장 (N/mm2) | 22.3 | 22.2 | 21.8 | 21.9 | |||
신율 (%) | 88.1 | 87.2 | 85.6 | 86.6 | |||
Modulus | 102.1 | 105.3 | 101.1 | 103.1 | |||
Sub pad |
Type | 부직포 | 부직포 | 부직포 | 부직포 | ||
두께 (mm) | 1.1 | 1.1 | 1.1 | 1.1 | |||
경도 (C) | 70 | 70 | 70 | 70 | |||
Stack pad |
두께 (mm) | 3.32 | 3.32 | 3.32 | 3.32 | ||
압축률 (%) | 1.05 | 1.05 | 1.05 | 1.05 |
Item | Unit | 실시예 1 | 실시예 2 | 비교예 1 | 비교예 2 | 비교예 3 | |
Pore Size |
D10 | μm | 13.4 | 14.9 | 26.4 | 21.5 | 캐스팅 불가 |
D50 | 18.9 | 21.6 | 40.9 | 31.1 | |||
D90 | 23.5 | 27.2 | 63.1 | 46.5 |
상세 | 측정조건 | |
측정 | 측정모드 | VSI/VXI |
접안렌즈 | 5배율 | |
대물렌즈 | 1.5배율 | |
측정 면적 | X-axis | 1182.6㎛ |
Y-axis | 893.8㎛ | |
스캔 옵션 | 속도 | x1 |
백 스캔(backscan) | 10㎛ | |
길이(length) | 80 ㎛ | |
임계(threshold) 값 | 5% |
Pad | Initial | After CMP | Spk 감소율 |
Spk | Spk | ||
실시예 1 | 4.4 | 4.1 | 6.85% |
실시예 2 | 4.7 | 5.2 | 19.15% |
비교예 1 | 7.6 | 5.0 | 34.21% |
비교예 2 | 7.4 | 5.3 | 28.38% |
비교예 3 | 캐스팅 불가로 인한 pad 제조 불가 |
SMPL | 실시예 1 | 실시예2 | 비교예1 | 비교예2 | 비교예 3 | |
ceria slurry | Ox RR (Å/min) |
2799 | 2831 | 2811 | 2838 | 캐스팅 불가로 인한 pad 제조 불가 |
절삭률 (㎛/hr) |
19.4 | 19.2 | 19.1 | 19.1 | ||
Spk 감소율 | 6.85% | 19.15% | 34.21% | 28.38% | ||
Defect/Scratch | 0 | 2 | 121 | 101 |
11: 비팽창된 입자의 외피
12: 팽창 유발 성분
20: 팽창된 입자
30: 경화 공정
40: 연마층 내 기공
110: 연마패드
120: 정반
130: 반도체 기판
140: 노즐
150: 연마 슬러리
160: 연마헤드
170: 컨디셔너
Claims (10)
- 연마층을 포함하고,
상기 연마층은 복수의 기공을 포함하며,
상기 기공의 D10은 10 내지 15㎛이고,
상기 연마층의 밀도가 0.7g/cc 내지 0.9g/cc이며,
상기 연마층의 연마면은 하기 식 1에 따른 Spk 감소율이 5 내지 20%인
연마 패드:
[식 1]
여기서,
Spk는 표면 거칠기에 대한 3차원 파라미터에 관한 것으로, 전체 표면 거칠기에 대한 높이를 그래프로 표현한 후, 튀어나온 피크의 평균 높이를 의미하며,
초기 Spk는 연마 공정 전 연마층의 연마면에 대한 Spk이며,
연마 후 Spk는 실리콘 옥사이드가 증착된 300mm 직경의 실리콘 웨이퍼에 대해, 상기 연마패드를 정반에 부착한 후, 연마 하중이 4.0psi이고, 연마 패드의 회전 속도가 150rpm이며, 하소 세리아 슬러리를 250㎖/분의 속도로 투입하고, 60초간 연마 공정 후 측정한 연마층의 연마면에 대한 Spk이다. - 삭제
- 제1항에 있어서,
상기 기공의 D50은 15 내지 25㎛인
연마 패드. - 제1항에 있어서,
상기 기공의 D90은 20 내지 30㎛인
연마 패드. - 제1항에 있어서,
상기 연마층은 프리폴리머 조성물, 발포제, 경화제 및 촉매를 포함하는 연마층 제조용 조성물의 경화물을 포함하며,
상기 발포제는 비팽창된(Unexpanded) 고상 발포제인
연마 패드. - 제5항에 있어서,
상기 촉매는 아민계 촉매, 비스무스계 금속 촉매, Sn계 금속 촉매 및 이들의 혼합으로 이루어진 군으로부터 선택되는
연마 패드. - ⅰ) 프리폴리머 조성물을 제조하는 단계;
ⅱ) 상기 프리폴리머 조성물, 발포제, 경화제 및 촉매를 포함하는 연마층 제조용 조성물을 제조하는 단계; 및
ⅲ) 상기 연마층 제조용 조성물을 경화하여 연마층을 제조하는 단계;를 포함하며,
상기 연마층은 복수의 기공을 포함하며,
상기 기공의 D10은 10 내지 15㎛이고,
상기 연마층의 밀도가 0.7g/cc 내지 0.9g/cc이며,
상기 연마층의 연마면은 하기 식 1에 따른 Spk 감소율이 5 내지 20%인
연마 패드의 제조 방법:
[식 1]
여기서,
Spk는 표면 거칠기에 대한 3차원 파라미터에 관한 것으로, 전체 표면 거칠기에 대한 높이를 그래프로 표현한 후, 튀어나온 피크의 평균 높이를 의미하며,
초기 Spk는 연마 공정 전 연마층의 연마면에 대한 Spk이며,
연마 후 Spk는 실리콘 옥사이드가 증착된 300mm 직경의 실리콘 웨이퍼에 대해, 상기 연마패드를 정반에 부착한 후, 연마 하중이 4.0psi이고, 연마 패드의 회전 속도가 150rpm이며, 하소 세리아 슬러리를 250㎖/분의 속도로 투입하고, 60초간 연마 공정 후 측정한 연마층의 연마면에 대한 Spk이다. - 제7항에 있어서,
상기 발포제는 비팽창된(Unexpanded) 입자이며,
상기 ⅲ) 단계의 경화 공정에 의해 팽창되어 균일한 크기로 복수의 기공을 형성하는
연마 패드의 제조 방법. - 제7항에 있어서,
상기 촉매는 프리폴리머 100 중량부에 대해 0.001 내지 0.01 중량부로 포함하는
연마 패드의 제조 방법. - 1) 연마층을 포함하는 연마패드를 제공하는 단계; 및
2) 상기 연마층의 연마면에 반도체 기판의 피연마면이 맞닿도록 상대 회전시키면서 상기 반도체 기판을 연마시키는 단계;를 포함하고,
상기 연마층은 복수의 기공을 포함하며,
상기 기공의 D10은 10 내지 15㎛이고,
상기 연마층의 밀도가 0.7g/cc 내지 0.9g/cc이며,
상기 연마층의 연마면은 하기 식 1에 따른 Spk 감소율이 5 내지 20%인
반도체 소자의 제조 방법:
[식 1]
여기서,
Spk는 표면 거칠기에 대한 3차원 파라미터에 관한 것으로, 전체 표면 거칠기에 대한 높이를 그래프로 표현한 후, 튀어나온 피크의 평균 높이를 의미하며,
초기 Spk는 연마 공정 전 연마층의 연마면에 대한 Spk이며,
연마 후 Spk는 실리콘 옥사이드가 증착된 300mm 직경의 실리콘 웨이퍼에 대해, 상기 연마패드를 정반에 부착한 후, 연마 하중이 4.0psi이고, 연마 패드의 회전 속도가 150rpm이며, 하소 세리아 슬러리를 250㎖/분의 속도로 투입하고, 60초간 연마 공정 후 측정한 연마층의 연마면에 대한 Spk이다.
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CN202111596533.7A CN114762953B (zh) | 2020-12-30 | 2021-12-24 | 抛光垫、抛光垫的制备方法及半导体器件的制造方法 |
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US17/564,742 US20220203496A1 (en) | 2020-12-30 | 2021-12-29 | Polishing pad, manufacturing method thereof, method for manufacturing semiconductor device using same |
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