Lithographic mask and methods for fabricating a semiconductor device
First Claim
Patent Images
1. A method for fabricating a semiconductor device comprising the steps of:
- providing a semiconductor substrate;
depositing a material layer overlying the semiconductor substrate;
applying a layer of photosensitive material overlying the material layer;
positioning a lithographic mask over the layer of photosensitive material, the mask comprising an optically transparent portion, an attPSM pattern that produces a phase shift of about 180°
, and a phase shifted optically transparent portion having a first edge and a second edge, the first edge abutting the attPSM pattern and the second edge abutting the optically transparent portion;
exposing the layer of photosensitive material to radiation passing through the mask to form selectively exposed portions of the layer of photosensitive material;
developing the layer of photosensitive material to form a patterned layer overlying the material layer; and
processing the material layer using the patterned layer as a process mask.
6 Assignments
0 Petitions
Accused Products
Abstract
Methods for fabricating a semiconductor device and a lithographic mask of use in that method are provided for. The lithographic mask comprises an optically transparent substrate, an attPSM pattern overlying the optically transparent substrate, and a phase shifted optically transparent portion adjacent to and aligned with an edge of the attPSM pattern.
-
Citations
20 Claims
-
1. A method for fabricating a semiconductor device comprising the steps of:
-
providing a semiconductor substrate; depositing a material layer overlying the semiconductor substrate; applying a layer of photosensitive material overlying the material layer; positioning a lithographic mask over the layer of photosensitive material, the mask comprising an optically transparent portion, an attPSM pattern that produces a phase shift of about 180°
, and a phase shifted optically transparent portion having a first edge and a second edge, the first edge abutting the attPSM pattern and the second edge abutting the optically transparent portion;exposing the layer of photosensitive material to radiation passing through the mask to form selectively exposed portions of the layer of photosensitive material; developing the layer of photosensitive material to form a patterned layer overlying the material layer; and processing the material layer using the patterned layer as a process mask. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method for fabricating a semiconductor device comprising the steps of:
-
forming a layer of material overlying a semiconductor substrate; applying a layer of photosensitive material overlying the layer of material; directing radiation through a mask to selectively expose a first portion of the layer of photosensitive material and to leave unexposed a second portion of the layer of photosensitive material, the mask comprising an attPSM pattern bounded by a phase shifted optically transparent portion to define the second portion, the attPSM pattern producing a phase shift of about 180°
, the phase shifted optically transparent portion having a first edge adjacent to the attPSM pattern and a second edge adjacent a non-phase shifted optically transparent portion; anddeveloping the layer of photosensitive material to form a process mask overlying the layer of material. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. A lithographic mask comprising:
-
an optically transparent substrate having a non-phase shifted optically transparent portion; an attPSM pattern overlying the optically transparent substrate that produces a phase shift of about 180°
; anda phase shifted optically transparent portion etched into the surface of the optically transparent substrate and having a first edge and a second edge, the first edge abutting and aligned with an edge of the attPSM pattern and the second edge abutting and aligned with the non-phase shifted optically transparent portion of the optically transparent substrate. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification