Anti-reflective coating with high optical absorption layer for backside contact solar cells

US8748736B2 · kind B2 · utility

Assignee

• SUNPOWER CORPORATION · US

Inventors

• Hsin-Chiao Luan · Palo Alto, US
• Denis De Ceuster · Woodside, US

Key dates

• Filing date: May 14, 2012
• Grant date: Jun 10, 2014
• Expiry date: May 14, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/547

Abstract

A multilayer anti-reflection structure for a backside contact solar cell. The anti-reflection structure may be formed on a front side of the backside contact solar cell. The anti-reflection structure may include a passivation level, a high optical absorption layer over the passivation level, and a low optical absorption layer over the high optical absorption layer. The passivation level may include silicon dioxide thermally grown on a textured surface of the solar cell substrate, which may be an N-type silicon substrate. The high optical absorption layer may be configured to block at least 10% of UV radiation coming into the substrate. The high optical absorption layer may comprise high-k silicon nitride and the low optical absorption layer may comprise low-k silicon nitride.