KR100697277B1 - 각도-분해 분광 리소그래피 특성화를 위한 방법 및 장치 - Google Patents
각도-분해 분광 리소그래피 특성화를 위한 방법 및 장치 Download PDFInfo
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Abstract
Description
Claims (56)
- 기판의 특성을 측정하도록 구성된 스캐터로미터에 있어서,높은 개구수 렌즈;상기 기판의 표면으로부터 반사된 방사선 빔의 각도-분해 스펙트럼을 검출하도록 구성된 검출기; 및상기 검출기를 이용한 별도의 측정을 위해, 방사선 소스로부터 방출된 방사선 빔의 일부분을 커플링하도록 구성된 경사진 거울 및 비-편광 빔 분할기를 포함하여 이루어지고,상기 높은 개구수 렌즈의 퓨필 평면에서, 복수의 각도들에서의 반사된 스펙트럼의 특성을 동시에 측정함으로써, 상기 기판의 특성이 측정될 수 있는 것을 특징으로 하는 스캐터로미터.
- 제1항에 있어서,상기 렌즈의 상기 개구수는 0.9 이상인 것을 특징으로 하는 스캐터로미터.
- 제1항에 있어서,상기 반사된 스펙트럼의 특성은, (a) 횡자기적 및 횡전기적 편광된 광의 세기, (b) 횡자기적 편광된 광과 횡전기적 편광된 광간의 위상차, 또는 (a)와 (b) 양자 모두를 포함하여 이루어지는 것을 특징으로 하는 스캐터로미터.
- 제1항에 있어서,상기 높은 개구수 렌즈의 퓨필 평면에서, 복수의 파장들에서의 반사된 스펙 트럼의 특성을 측정함으로써, 상기 기판의 특성이 측정되는 것을 특징으로 하는 스캐터로미터.
- 제4항에 있어서,상기 복수의 파장들 각각은 δλ의 대역폭 및 2δλ이상의 간격을 가지는 것을 특징으로 하는 스캐터로미터.
- 제1항에 있어서,반사된 스펙트럼내의 비대칭성을 측정함으로써, 오정렬된 2개의 주기적 구조체들의 오버레이가 측정될 수 있으며, 상기 비대칭성은 상기 오버레이의 크기와 관련되는 것을 특징으로 하는 스캐터로미터.
- 제1항에 있어서,방사선 빔을 제공하도록 구성된 방사선 소스와 상기 기판 사이의 파장 다중화기; 및상기 기판과 상기 검출기 사이의 비-다중화기를 포함하여 이루어지는 것을 특징으로 하는 스캐터로미터.
- 제7항에 있어서,상기 파장 다중화기는, 각각 대역폭이 δλ이고 간격이 2δλ인 N개의 이산 파장들을 수용하도록 순응된 분산 요소, 예컨대 격자 또는 프리즘인 것을 특징으로 하는 스캐터로미터.
- 제6항에 있어서,상기 방사선 빔을 제공하도록 구성된 방사선 소스의 표면적이, 상기 파장 다중화기에 각각 커플링된 N개의 부분들로 분할되며, 여기서 N은 이산 파장들의 개수인 것을 특징으로 하는 스캐터로미터.
- 제1항에 있어서,퓨필 평면에서의 각도-분해 스펙트럼들의 정의된 거리를 얻기 위해서, 대물 평면에 광학 에지를 포함하여 이루어지는 것을 특징으로 하는 스캐터로미터.
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- 제1항에 있어서,상기 방사선 빔의 일부분은, 상기 방사선 빔의 세기를 측정하고, 상기 방사선 빔의 세기의 변동들을 보상하기 위해서 사용되는 것을 특징으로 하는 스캐터로미터.
- 제1항에 있어서,상기 방사선 빔의 일부분의 크기를 제한하고 상기 방사선 빔의 일부분이 상기 방사선 빔의 나머지 부분에 대해 평행한 것을 보장하도록 구성된 퓨필 스톱을 포함하여 이루어지는 것을 특징으로 하는 스캐터로미터.
- 제1항에 있어서,상기 기판과 상기 높은 개구수 렌즈 사이에 액체를 포함하는 공간을 더욱 포함하는 것을 특징으로 하는 스캐터로미터.
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- 제1항에 있어서,중간 대물 평면의 반대 절반부들(opposite halves) 중 하나에 배치되도록 순응된 에지를 더욱 포함하는 것을 특징으로 하는 스캐터로미터.
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- 검사 방법에 있어서,평행하게 층을 이루지만(layered in parallel) 오정렬된 2개의 격자들을 포함하는 패턴을 기판상에 프린팅하여, 하나의 격자에 대해 다른 하나의 격자의 오버레이를 생성하는 단계;스캐터로미터를 이용하여 상기 격자들의 반사된 스펙트럼을 측정하는 단계;상기 반사된 스펙트럼의 비대칭성으로부터 상기 오버레이의 크기를 유도하는 단계를 포함하여 이루어지는 것을 특징으로 하는 검사 방법.
- 제26항에 있어서,상기 반사된 스펙트럼을 측정하는 단계는, (a) 복수의 각도들에서의 상기 반사된 스펙트럼의 특성, (b) 복수의 파장들에서의 상기 반사된 스펙트럼의 특성, 또는 (a)와 (b)를 동시에 측정하는 단계를 포함하여 이루어지는 것을 특징으로 하는 검사 방법.
- 제27항에 있어서,상기 반사된 스펙트럼의 특성은, (i) 횡자기적 및 횡전기적 편광된 광의 세기, (ii) 횡자기적 편광된 광과 횡전기적 편광된 광간의 위상차, 또는 (i)와 (ii) 양자 모두를 포함하여 이루어지는 것을 특징으로 하는 검사 방법.
- 삭제
- 삭제
- 제1항에 있어서,1이상의 반사기;1이상의 거울으로부터 반사되는 2개 이상의 이미지들을 검출하고 조합하도록 구성된 검출기; 및방사선 빔의 조명 프로파일이 검출될 수 있는 상기 이미지들에 기초하여 미분 방정식을 생성하도록 구성된 프로세서를 더 포함하여 이루어지는 것을 특징으로 하는 스캐터로미터.
- 제31항에 있어서,상기 조명 프로파일은, 보다 높은 회절 차수들에서의 반사된 스펙트럼의 특성의 측정들을 보정하는데 사용되는 것을 특징으로 하는 스캐터로미터.
- 제31항에 있어서,상기 반사기는 오목 거울을 포함하여 이루어지고, 상기 스캐터로미터는 상기 거울의 표면에 걸쳐 방사선 빔을 이동시키는 기구를 포함하여, 복수의 반사 각도들을 얻는 것을 특징으로 하는 스캐터로미터.
- 제31항에 있어서,상기 반사기는 볼록 거울을 포함하여 이루어지고, 상기 스캐터로미터는 상기 거울의 표면에 걸쳐 방사선 빔을 이동시키는 기구를 포함하여, 복수의 반사 각도들을 얻는 것을 특징으로 하는 스캐터로미터.
- 제31항에 있어서,상기 반사기들은 평탄한 거울을 포함하여 이루어지고, 상기 스캐터로미터는 복수의 각도들을 통해 상기 거울을 경사지게 하는 기구를 포함하여 이루어지는 것 을 특징으로 하는 스캐터로미터.
- 제31항에 있어서,상이한 경사 각도들을 갖는 복수의 거울들을 포함하여 이루어지는 것을 특징으로 하는 스캐터로미터.
- 제31항에 있어서,측정된 반사 각도는 방사 방향내에 있는 것을 특징으로 하는 스캐터로미터.
- 제31항에 있어서,측정된 반사 각도는 방위각 방향내에 있는 것을 특징으로 하는 스캐터로미터.
- 삭제
- 제1항에 있어서,상기 방사선 빔을 선형으로 편광시키도록 구성된 제 1 편광기;상기 방사선 빔을 2개의 직교 성분들(ETE 및 ETH)로 분할시키도록 구성된 빔 분할기;스캐터링된 광을 편광시키도록 구성된 제 2 편광기;상기 제 1 편광기와 상기 제 2 편광기 사이에 위치되며, 직교 편광된 성분들간의 광학 경로차를 변화시키도록 구성된 가변 보상기; 및그 결과적인 빔 성분들의 사인곡선 세기 변화를 검출하는 2차원 검출기를 더 포함하여 이루어지는 것을 특징으로 하는 스캐터로미터.
- 제40항에 있어서,상기 보상기는 스캐터로미터의 조명 브랜치내에 위치되는 것을 특징으로 하는 스캐터로미터.
- 제40항에 있어서,상기 보상기는 상기 빔 분할기와 상기 높은 개구수 렌즈 사이에 위치되는 것을 특징으로 하는 스캐터로미터.
- 제1항에 있어서,개략적 오버레이 측정들을 수행하는 제 2 검출기 브랜치를 더 포함하여 이루어지는 것을 특징으로 하는 스캐터로미터.
- 제43항에 있어서,제 2 검출기 브랜치는 상기 기판의 이미지 평면내에 존재하는 것을 특징으로 하는 스캐터로미터.
- 제43항에 있어서,상기 제 2 검출기 브랜치는 기판상의 오버레이 오차들을 측정하도록 구성되며, 상기 오차들은 정수와 기판 격자의 피치의 곱과 같은 것을 특징으로 하는 스캐터로미터.
- 제26항에 있어서,상기 격자들의 개략적 오버레이 측정을 수행하여, 상기 오버레이가 격자 피치 폭보다 더 큰지를 결정하는 단계를 포함하여 이루어지는 것을 특징으로 하는 검사 방법.
- 제46항에 있어서,i) 방사선 빔의 2개의 이미지 평면 측정들을 수행하여, 격자 피치보다 더 큰 오버레이 오차의 존재를 결정하는 단계; 및ii) 결정된 오버레이가 사전설정된 임계값 이하인 경우, 방사선 빔의 퓨필 평면 측정을 수행하는 단계를 포함하여 이루어지는 것을 특징으로 하는 검사 방법.
- 삭제
- 삭제
- 제1항에 있어서,기판상으로 복수의 조명 스폿들을 투영시키도록 구성된 투영기를 더욱 포함하여 이루어지며,상기 검출기는 상기 기판의 표면으로부터 반사된 복수의 방사선 스폿들의 각도-분해 스펙트럼을 동시에 검출하도록 더욱 구성되어 있는 것을 특징으로 하는 스캐터로미터.
- 제50항에 있어서,동일하게 편광된 2개의 조명 스폿들을 생성하는 분리기(divider)를 포함하여 이루어지는 것을 특징으로 하는 스캐터로미터.
- 삭제
- 삭제
- 삭제
- 삭제
- 삭제
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KR100954762B1 (ko) | 2006-12-08 | 2010-04-28 | 에이에스엠엘 네델란즈 비.브이. | 스케터로미터, 리소그래피 장치 및 포커스 분석 방법 |
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