Patent Number: 8,796,066

Title: Low-cost solar cells and methods for fabricating low cost substrates for solar cells

Abstract: Substrates for solar cells are prepared by etching a plurality of metallurgical grade wafers; depositing aluminum layer on backside of each wafer; depositing a layer of hydrogenated silicon nitride on front surface of each wafer; annealing the wafers at elevated temperature; removing the hydrogenated silicon nitride without disturbing the aluminum layer. A solar cell is then fabricated on the front surface of the wafer while the aluminum remain to serve as the back contact of the cell.

Inventors: Sinha; Ashok (Los Altos Hill, CA), Ma; Wen (Fremont, CA)

Assignee: Sunpreme, Inc.

International Classification: H01L 21/00 (20060101)

Expiration Date: 8/05/12018