KR102029967B1 - 회절 기반 오버레이 메트롤로지 툴 및 방법 - Google Patents
회절 기반 오버레이 메트롤로지 툴 및 방법 Download PDFInfo
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Abstract
Description
도 1은 본 발명의 일 실시예에 따른 리소그래피 장치를 나타낸 도;
도 2a, 2b, 2c는 일 실시예에 따른 회절을 토대로 한 오버레이 오차 메트롤로지를 예시한 도;
도 3a, 3b는 각각 제 1 측정과 제 2 측정 동안의 본 발명의 일 실시예에 따른 회절 기반 오버레이 오차 검출시스템을 나타낸 도;
도 4a는 오버레이 오차의 함수로서 -1차 회절 빔 및 1차 회절 빔의 세기의 예시적 측정치들을 예시한 도;
도 4b는 오버레이 오차의 함수로서 -1차 회절 빔과 1차 회절 빔 간의 세기의 차이를 예시한 도;
도 5는 본 발명에 따라 결정된 회절 기반 오버레이 오차와 이미지 기반 오버레이 오차 간의 상관관계를 나타낸 도이다.
Claims (20)
- 기판의 표면 상의 제 1 패턴과 상기 제 1 패턴 상에 중첩되는(superimposed) 제 2 패턴 간의 오버레이 오차(overlay error)를 결정하기 위한 방법에 있어서,
상기 제 1 패턴은 제 1 격자를 포함하고, 상기 제 2 패턴은 상기 제 1 격자 위의 제 2 격자를 포함하며, 상기 제 2 격자는 상기 제 1 격자와 동일한 피치(pitch)를 갖고, 상기 제 2 격자 및 상기 제 1 격자는 복합 격자(composite grating)를 형성하며,
상기 방법은,
적어도 상기 복합 격자를 입사 각으로 조명하기 위한 제 1 조명 빔을 제공하는 단계 - 상기 제 1 조명 빔은 상기 기판의 표면을 따르는 제 1 수평 방향을 따르는 성분을 갖는 방향을 따라 전파되고, 상기 기판은 고정된 위치에 있음 -;
상기 복합 격자로부터 고차 회절 빔의 제 1 세기를 측정하는 단계;
적어도 상기 복합 격자를 상기 입사 각으로 조명하기 위한 제 2 조명 빔을 제공하는 단계 - 상기 제 2 조명 빔은 상기 기판의 표면을 따르는 제 2 수평 방향을 따르는 성분을 갖고, 상기 제 2 수평 방향은 상기 제 1 수평 방향과 반대되며, 상기 기판은 고정된 위치에 있음 - ;
상기 복합 격자로부터 고차 회절 빔의 제 2 세기를 측정하는 단계;
상기 제 1 조명 빔을 제공할 때, 전체 회절 차수의 빔들 중에서 상기 고차 회절 빔을 통과시키는 단계; 및
상기 제 2 조명 빔을 제공할 때, 전체 회절 차수의 빔들 중에서 상기 고차 회절 빔을 통과시키는 단계를 포함하는 오버레이 오차 결정 방법. - 제 1 항에 있어서,
상기 제 1 세기와 상기 제 2 세기 간의 세기 차를 결정하는 단계를 더 포함하고,
상기 세기 차는 상기 제 1 격자와 상기 제 2 격자 간의 오버레이 오차에 비례하는 오버레이 오차 결정 방법. - 제 1 항에 있어서,
상기 제 1 및 제 2 조명 빔들은 공통 조명 빔의 부분들인 오버레이 오차 결정 방법. - 제 3 항에 있어서,
상기 공통 조명 빔은 환형 단면을 갖는 오버레이 오차 결정 방법. - 제 1 항에 있어서,
상기 입사 각은 상기 기판의 표면에 대해 빗각(oblique)이며,
상기 표면의 법선에 대한 고차 회절 빔의 회절 각은 상기 입사 각보다 작은 오버레이 오차 결정 방법. - 제 1 항에 있어서,
입사 각은 상기 기판의 표면에 대해 수직이고,
상기 방법은 상기 제 1 조명 빔을 상기 제 2 조명 빔으로 이용하는 단계를 포함하며,
상기 복합 격자로부터 고차 회절 빔의 제 1 세기를 측정하는 단계, 및 상기 복합 격자로부터 고차 회절 빔의 제 2 세기를 측정하는 단계는, 상기 제 1 조명 빔의 제공 시 연속적으로 수행되는 오버레이 오차 결정 방법. - 제 1 항에 있어서,
상기 복합 격자로부터 고차 회절 빔의 제 1 세기를 측정하는 단계는, 패턴 인식(pattern recognition)에 의하여 상기 고차 회절 빔에 의해서만 얻어지는 상기 복합 격자의 이미지를 검출하는 단계를 포함하고,
상기 복합 격자로부터 고차 회절 빔에 의해서만 얻어지는 상기 복합 격자의 제 2 세기를 측정하는 단계는, 패턴 인식에 의하여 상기 고차 회절 빔에 의해서만 얻어지는 상기 복합 격자의 이미지를 검출하는 단계를 포함하는 오버레이 오차 결정 방법. - 제 1 항에 있어서,
상기 기판 상에 제 2 복합 격자를 제공하는 단계 - 상기 제 2 복합 격자는 상기 제 1 패턴에서의 제 3 격자 및 상기 제 3 격자 위의 제 4 격자에 의하여 형성되고, 상기 제 3 격자 및 상기 제 4 격자는 상기 제 1 격자 및 상기 제 2 격자와 동일한 피치를 가지며, 상기 복합 격자는 격자 방향을 따르는 시프트 방향으로 제 1 시프트만큼 바이어싱되고(biased), 상기 제 2 복합 격자는 상기 격자 방향을 따르는 시프트 방향으로 제 2 시프트만큼 바이어싱되며, 상기 제 1 시프트는 상기 제 2 시프트와는 상이함 - ;
상기 제 2 복합 격자를 상기 입사 각으로 조명하기 위한 상기 제 1 조명 빔을 제공하는 단계 - 상기 제 1 조명 빔은 상기 기판의 표면을 따르는 상기 제 1 수평 방향을 따르는 성분을 갖는 방향을 따라 전파되고, 상기 기판은 고정된 위치에 있음 - ;
상기 제 2 복합 격자로부터 고차 회절 빔의 제 1 세기를 측정하는 단계;
상기 제 2 복합 격자를 상기 입사 각으로 조명하기 위한 상기 제 2 조명 빔을 제공하는 단계 - 상기 제 2 조명 빔은 상기 기판의 표면을 따르는 상기 제 2 수평 방향을 따르는 성분을 갖는 방향을 따라 전파됨 - ; 및
상기 제 2 복합 격자로부터 고차 회절 빔의 제 2 세기를 측정하는 단계를 더 포함하는 오버레이 오차 결정 방법. - 기판의 표면 상의 제 1 패턴과 상기 제 1 패턴 상에 중첩되는 제 2 패턴 간의 오버레이 오차를 결정하도록 구성되는 검출 시스템 장치에 있어서,
상기 제 1 패턴은 제 1 격자를 포함하고, 상기 제 2 패턴은 상기 제 1 격자 위의 제 2 격자를 포함하며, 상기 제 2 격자는 상기 제 1 격자와 동일한 피치를 갖고, 상기 제 2 격자 및 상기 제 1 격자는 복합 격자를 형성하며,
상기 검출 시스템 장치는,
조명 소스 - (a) 상기 조명 소스는 상기 기판 상의 상기 복합 격자를 입사 각으로 조명하기 위한 제 1 조명 빔을 형성하여, 상기 제 1 조명 빔이 상기 기판의 표면을 따르는 제 1 수평 방향을 따르는 성분을 갖는 방향을 따라 전파되도록 구성되고, 상기 기판은 기판 위치에 있고, (b) 상기 조명 소스는 상기 기판 상의 상기 복합 격자를 입사 각으로 조명하기 위한 제 2 조명 빔을 형성하여, 상기 제 2 조명 빔이 상기 기판의 표면을 따르는 제 2 수평 방향을 따르는 성분을 갖는 방향을 따라 전파되도록 구성되며, 상기 제 2 수평 방향은 상기 제 1 수평 방향과 반대되고, 상기 기판은 기판 위치에 있음 - ;
상기 복합 격자로부터 고차 회절 빔을 수용하도록 구성되는 이미지 검출기;
상기 기판 위치와 상기 이미지 검출기 간의 광학 경로를 따라 배치되는 복수의 렌즈; 및
어퍼처 스톱(aperture stop)을 포함하고,
상기 검출 시스템 장치의 어퍼처 스톱은, 상기 제 1 조명 빔을 형성할 때, 전체 회절 차수의 빔들 중에서 상기 고차 회절 빔이 상기 어퍼처 스톱을 통과하고, 상기 제 2 조명 빔을 형성할 때, 전체 회절 차수의 빔들 중에서 상기 고차 회절 빔이 상기 어퍼처 스톱을 통과하도록 구성되는 검출 시스템 장치. - 제 9 항에 있어서,
상기 이미지 검출기는 패턴 인식 방법에 의하여 상기 고차 회절 빔만을 이용하여 상기 복합 격자의 이미지를 검출하도록 구성되는 검출 시스템 장치. - 제 9 항에 있어서,
상기 복수의 렌즈들은 적어도 상기 기판의 표면에 인접한 대물 렌즈 및 상기 이미지 검출기에 인접한 투영 렌즈를 포함하고, 상기 어퍼처 스톱은 상기 대물 렌즈와 상기 투영 렌즈 사이의 광학 경로를 따라 배치되며,
상기 대물 렌즈는 제 1 개구수 값을 갖고, 상기 어퍼처 스톱은 제 2 개구수 값을 가지며, 상기 제 2 개구수 값은 상기 제 1 개구수 값보다 작은 검출 시스템 장치. - 기판의 표면 상의 제 1 패턴과 상기 제 1 패턴 상에 중첩되는 제 2 패턴 간의 오버레이 오차를 결정하도록 구성되는 검출시스템을 포함하는 리소그래피 장치에 있어서,
상기 제 1 패턴은 제 1 격자를 포함하고, 상기 제 2 패턴은 상기 제 1 격자 위의 제 2 격자를 포함하며, 상기 제 2 격자는 상기 제 1 격자와 동일한 피치를 갖고, 상기 제 2 격자 및 상기 제 1 격자는 복합 격자를 형성하며,
상기 검출 시스템은,
조명 소스 - (a) 상기 조명 소스는 상기 기판 상의 상기 복합 격자를 입사 각으로 조명하기 위한 제 1 조명 빔을 형성하여, 상기 제 1 조명 빔이 상기 기판의 표면을 따르는 제 1 수평 방향을 따르는 성분을 갖는 방향을 따라 전파되도록 구성되고, 상기 기판은 기판 위치에 있고, (b) 상기 조명 소스는 상기 기판 상의 상기 복합 격자를 입사 각으로 조명하기 위한 제 2 조명 빔을 형성하여, 상기 제 2 조명 빔이 상기 기판의 표면을 따르는 제 2 수평 방향을 따르는 성분을 갖는 방향을 따라 전파되도록 구성되며, 상기 제 2 수평 방향은 상기 제 1 수평 방향과 반대되고, 상기 기판은 기판 위치에 있음 - ;
상기 복합 격자로부터 고차 회절 빔을 수용하도록 구성되는 이미지 검출기;
상기 기판 위치와 상기 이미지 검출기 간의 광학 경로를 따라 배치되는 복수의 렌즈; 및
어퍼처 스톱을 포함하고,
상기 검출 시스템의 어퍼처 스톱은, 상기 제 1 조명 빔을 형성할 때, 전체 회절 차수의 빔들 중에서 상기 고차 회절 빔이 상기 어퍼처 스톱을 통과하고, 상기 제 2 조명 빔을 형성할 때, 전체 회절 차수의 빔들 중에서 상기 고차 회절 빔이 상기 어퍼처 스톱을 통과하도록 구성되는 리소그래피 장치. - 제 12 항에 있어서,
방사선 빔을 컨디셔닝(condition)하도록 구성되는 조명 시스템;
패터닝 디바이스를 유지하도록 구성되는 패터닝 디바이스 지지체 - 상기 패터닝 디바이스는 상기 방사선 빔을 패터닝하여 패터닝된 방사선 빔을 형성하도록 구성됨 - ;
상기 기판을 유지하도록 구성되는 기판 테이블; 및
상기 패터닝된 방사선 빔을 상기 기판 상으로 투영하도록 구성되는 투영 시스템을 더 포함하는 리소그래피 장치. - 제 12 항에 있어서,
상기 이미지 검출기는 패턴 인식 방법에 의하여 상기 고차 회절 빔만을 이용하여 상기 복합 격자의 이미지를 검출하도록 구성되는 리소그래피 장치. - 제 14 항에 있어서,
상기 복수의 렌즈는 적어도 상기 기판의 표면에 인접한 대물 렌즈 및 상기 이미지 검출기에 인접한 투영 렌즈를 포함하고, 상기 어퍼처 스톱은 상기 대물 렌즈와 상기 투영 렌즈 사이의 광학 경로를 따라 배치되며,
상기 대물 렌즈는 제 1 개구수 값을 갖고, 상기 어퍼처 스톱은 제 2 개구수 값을 가지며, 상기 제 2 개구수 값은 상기 제 1 개구수 값보다 작은 리소그래피 장치. - 삭제
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