Manufacturing method for a semiconductor device
View Patent ↗In a manufacturing method for divisionally exposing a wafer, a focus correction processing is performed after a shot is moved to a position where the focus correction processing for all foci is enabled when the shot is at a wafer outer periphery, and a portion overlapped with an adjacent exposure area is shielded from light by a reticle blind to expose only an opening area unshielded by the reticle blind.
1. A manufacturing method for a semiconductor device including a divisional exposure of a wafer, the method comprising:
determining whether or not all of focus detection positions for an area of a subsequent shot are on the wafer, after exposure of a previous shot has been completed;
moving the subsequent shot to a position where focus correction can be processed for all of the focus detection positions within the subsequent shot when at least one focus detection position among all of the focus detection positions is not on the wafer;
performing defocus detection and focus correction processing by the moved subsequent shot;
shielding an area overlapped with an adjacent exposure area from light by a reticle blind; and
exposing a first small exposure area through an opening area surrounded by the reticle blind.
2. A manufacturing method for a semiconductor device according to claim 1 , wherein a number of semiconductor devices formed in the first small exposure area is maximized.
3. A manufacturing method for a semiconductor device according to claim 1 , wherein the reticle blind comprises a liquid crystal shutter.
4. A manufacturing method for a semiconductor device, which divisionally exposes a wafer, comprising:
determining whether or not all of focus detection positions within an area of a subsequent shot are on the wafer, after exposure of a previous shot has been completed;
moving the subsequent shot to a first position where focus correction processing is enabled at all of the focus detection positions within the subsequent shot when at least one focus detection position among all of the focus detection positions is not on the wafer;
performing defocus detection and focus correction processing by the subsequent shot moved to the first position;
shielding an area overlapped with an adjacent exposure area from light by a reticle blind;
exposing a first small exposure area through an opening area surrounded by the reticle blind;
moving the subsequent shot at the first position to a second position so that the subsequent shot is inscribed in a wafer outer periphery;
performing defocus detection and focus correction processing by the subsequent shot moved to the second position;
shielding an area overlapped with the adjacent exposure area and the first small exposure area from light by the reticle blind; and
exposing a second small exposure area through an opening area surrounded by the reticle blind that shields the area overlapped with the adjacent exposure area and the first small exposure area from light.
5. A manufacturing method for a semiconductor device according to claim 4 , wherein a number of semiconductor devices formed in the first small exposure area and the second small exposure area is maximized.
6. A manufacturing method for a semiconductor device according to claim 4 , wherein a number of semiconductor devices formed in the first small exposure area and the second small exposure area is maximized except for an invalid area at a wafer outer periphery.
7. A manufacturing method for a semiconductor device according to claim 6 , wherein the invalid area at the wafer outer periphery is an area of 3 mm from an edge of the wafer outer periphery.
8. A manufacturing method for a semiconductor device according to claim 4 , wherein the reticle blind comprises a liquid crystal shutter.