Patent ID: 9202706
Filing Date: 2015-12-01
Classification: H01J,H01L

Abstract:
1. A method of forming a pattern on a silicon layer of a substrate to be processed, comprising: a forming step of forming a plurality of semiconductor devices that correspond to a plurality of unit pixels of a solid-state image sensor device at a front surface side of the silicon layer to form the substrate to be processed; a forming step of forming a mask having a predetermined pattern on the back surface of the silicon layer; an etching step of etching the silicon layer of the substrate from the back surface of the silicon layer by plasma using the mask to form a pattern of a grid-like element isolation region in the silicon layer for isolating the plurality of the semiconductor devices, a cleaning step of cleaning the grid-like element isolation region of the silicon layer to remove the residual product by plasma using cleaning gas obtained by mixing methane tetrafluoride gas (CF