Patent ID: 6649529
Filing Date: 2003-11-18
Classification: G03F

Abstract:
A method of patterning a photoresist layer comprising:forming a selected layer over a semiconductor substrate, the selected layer having a plurality of alternating raised and recessed selected formations reflected on an upper surface thereof due to alternating raised and recessed substrate formations on an upper surface of the substrate; forming a photoresist layer over the selected layer, the photoresist layer having a plurality of raised and recessed photoresist formations reflected on an upper surface thereof due to the selected formations on the upper surface of the selected layer, peaks of successive raised photoresist formations being separated by a distance extending in a distance direction and each raised formation having a width extending in a wave direction transverse to the distance direction, the width being a multiple of the distance; locating a mask over the photoresist layer, the mask having a plurality of openings; and positioning an electromagnetic radiation source over the mask, the electromagnetic radiation source emanating a bundle of electromagnetic radiation having a length and a width transverse to the length, the width being a multiple of the length, the electromagnetic radiation source being aligned with the substrate so that the length of the bundle of electromagnetic radiation extends in a length direction which is substantially parallel to the distance direction, the electromagnetic radiation propagating through the openings in the mask onto selected areas of the photoresist layer so as to change the material of the selected areas into a material which can be selectively etched over a remainder of the photoresist layer.