Patent ID: 9590035
Date: 2017-03-07
CPC Classifications: H01L,Y02E,Y02P,Y10T

Claim:
1. A method for fabrication of a three-dimensional silicon template, the method comprising: forming a patterned mask on a silicon template surface defining a pattern of base openings, said pattern of base openings comprising a pattern of at least two differently sized base openings; selectively removing silicon material from said silicon template in said base openings to form a top surface aligned along a (100) crystallographic plane of the silicon template and a plurality of walls each aligned along a (111) crystallographic plane of the silicon template wherein said walls define inverted pyramidal cavities, said inverted pyramidal cavities comprising at least two differently sized inverted pyramidal cavities, said removal of silicon material comprising the steps of: anisotropically etching the silicon template to form a plurality of walls each aligned along a (111) crystallographic plane of the silicon template wherein said walls form an inverted pyramidal cavity.