Patent ID: 8053665
Filing Date: 2011-11-08
Classification: H01L,Y02E

Abstract:
1. A method for making a three-dimensional thin film solar cell, comprising: patterning a reusable crystalline silicon template with a periodic array of hexagonal pyramidal cavities according to a wet chemical etching process, said reusable crystalline silicon template having dimensions of approximately 200×200 millimeters; chemically cleaning said reusable crystalline silicon template; forming a sacrificial porous silicon release layer comprising at least two different porosity values on a surface of said reusable crystalline silicon template, said porous silicon release layer comprising: depositing a doped crystalline silicon film onto said sacrificial porous silicon release layer, said doped silicon film being substantially conformal to said reusable crystalline silicon template and having a thickness in the range of 2 to 50 microns; etching said sacrificial porous silicon release layer; detaching and removing said doped silicon film from said reusable crystalline silicon template; and removing a plurality of tips from said doped silicon film by: