Layout method of mask pattern, manufacturing method of a semiconductor device and exposure mask
According to one embodiment, a layout region of a mask pattern is divided into N (N is an integer of 2 or larger) units, a main pattern resolved by exposure light is arranged and sub patterns not resolved by the exposure light are arranged outside the main pattern such that distributions of attenuation amount of the exposure light in the divided layout regions are different.
1. A layout method of mask pattern, comprising:
dividing a layout region of a mask pattern into N (N is an integer of 2 or larger) units; and
arranging a main pattern resolved by exposure light and arranging a periodic structure of sub patterns not resolved by the exposure light outside the main pattern such that distributions of attenuation amount of the exposure light in the divided layout regions are different each other.
2. The layout method of mask pattern of claim 1 , wherein
the sub patterns are arranged on both sides of the main pattern, and
the numbers of the sub patterns are different in the adjacent divided layout regions.
3. The layout method of mask pattern of claim 1 , wherein
when the layout region is in an XY plane, the layout region is divided into N units in an X direction, and
the sub patterns are symmetrically arranged in the X direction.
4. The layout method of mask pattern of claim 3 , wherein
the layout region is divided into N units in an X direction such that the divided layout regions are symmetric in a Y direction, and
the layout regions symmetric in the Y direction of the divided layout regions are equal in distribution of attenuation amount of the exposure light.
5. The layout method of mask pattern of claim 1 , wherein
dividing positions in the layout region are set based on the difference between an edge position of a resist pattern with the use of the mask pattern before division of the layout region and an edge position of a processed pattern with the use of the resist pattern.
6. The layout method of mask pattern of claim 5 , wherein the difference is adjusted by adjusting the width and pitch of the sub patterns.
7. The layout method of mask pattern of claim 1 , wherein dividing positions in the layout region are set based on the cross section shape of the resist pattern with the use of the mask pattern before division of the layout region.
8. The layout method of mask pattern of claim 5 , wherein the cross section shape is adjusted by adjusting the width and pitch of the sub patterns.
9. The layout method of mask pattern of claim 1 , wherein
the sub patterns arranged in the layout regions with three sides at end portions of the divided layout regions include:
first sub patterns that are arranged on two sides opposed to one another; and
second sub patterns that are arranged on the one remaining side and are smaller in number than the first sub patterns.
10. An exposure mask, wherein
a layout region of a mask pattern is divided into N (N is an integer of 2 or larger) units; and
a main pattern resolved by exposure light is arranged and a periodic structure of sub patterns not resolved by the exposure light is arranged outside the main pattern such that distributions of attenuation amount of the exposure light in the divided layout regions are different.
11. The exposure mask of claim 10 , wherein
the sub patterns are arranged on both sides of the main pattern, and
the numbers of the sub patterns are different in the adjacent divided layout regions.
12. The exposure mask of claim 10 , wherein
when the layout region is in an XY plane, the layout region is divided into N units in an X direction, and
the sub patterns are symmetrically arranged in the X direction.
13. The exposure mask of claim 12 , wherein
the layout region is divided into N units in an X direction such that the divided layout regions are symmetric in a Y direction, and
the layout regions symmetric in the Y direction of the divided layout regions are equal in distribution of attenuation amount of the exposure light.
14. The exposure mask of claim 10 , wherein
the sub patterns arranged in the layout regions with three sides at end portions of the divided layout regions include:
first sub patterns that are arranged on two sides opposed to one another; and
second sub patterns that are arranged on the one remaining side and are smaller in number than the first sub patterns.