Patent ID: 7335449
Filing Date: 2008-02-26
Classification: G03F

Abstract:
1. A mask comprising: a transparent substrate having trenches therein; a main pattern at a central region of the transparent substrate, said main pattern comprising a main light-shielding portion that absorbs exposure light of a given wavelength and thereby shields the substrate, and a main light-transmitting portion consisting of spaced apart light-transmitting features that transmit the exposure light; and a phantom pattern at a peripheral region of the transparent substrate extending along the periphery of the main pattern, said phantom pattern comprising a phantom light-shielding portion that absorbs the exposure light and thereby shields the substrate, and a phantom light-transmitting portion consisting of spaced apart light-transmitting features that transmit the exposure light, the pitch of said features of the light-transmitting portion of said phantom pattern being identical to the pitch of said features of the light-transmitting portion of the main pattern and the shape of the light-transmitting features of said phantom pattern being identical to the shape of the light-transmitting features of said main pattern, and wherein all of the light-transmitting features of the mask that are disposed along the periphery of the main pattern are features formed by substrate whereby the light-transmitting features of said phantom pattern, are formed by the trenches and scatter incident light of said given wavelength at the periphery of the main pattern.