Bifacial solar cells with back surface doping

US8404970B2 · kind B2 · utility

Assignee

• Silicor Materials Inc. · US

Inventors

• Martin Kaes · Berlin, DE
• Peter G. Borden · Mountain View, US
• Kamel Ounadjela · Belmont, US
• Andreas Kraenzl · Radolfzell, DE
• Alain Blosse · Belmont, US
• Fritz Kirscht · Berlin, DE

Key dates

• Filing date: Jun 15, 2009
• Grant date: Mar 26, 2013
• Expiry date: Apr 20, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P70/50

Abstract

A simplified manufacturing process and the resultant bifacial solar cell (BSC) are provided, the simplified manufacturing process reducing manufacturing costs. The BSC includes an active region located on the front surface of the substrate, formed for example by a phosphorous diffusion step. The back surface includes a doped region, the doped region having the same conductivity as the substrate but with a higher doping level. Contact grids are formed, for example by screen printing. Front junction isolation is accomplished using a laser scribe.