Patent ID: 9576842
Date: 2017-02-21
CPC Classifications: H01L

Claim:
1. A method of manufacturing a semiconductor device, the method comprising: providing a first semiconductor substrate having a first main surface and an opposing second main surface; forming a pattern into the first semiconductor substrate, the pattern including a plurality of trenches defining a plurality of mesas, each of the plurality of mesas having sidewalls and a free surface formed by material of the first semiconductor substrate; forming a thermal oxide mask layer on the first main surface of the first semiconductor substrate; forming a first layer of photoresist over the thermal oxide mask layer; etching the thermal oxide mask layer to form an opening defining on the first main surface of the first semiconductor substrate a location of a cavity to be formed; forming the cavity in the first semiconductor substrate such that the pattern is recessed in the cavity; forming an oxide layer in the cavity and on the sidewalls and free surfaces of the plurality of mesas; and etching the oxide layer to remove the oxide layer from the free surfaces of the plurality of mesas and at least a portion of the sidewalls of the plurality of mesas, wherein the step of forming the pattern into the first semiconductor substrate comprises: