Process for preparing passivated emitter rear contact (PERC) solar cells

US9966484B2 · kind B2 · utility

Assignee

• CSI CELLS CO., LTD. · CN

Inventors

• Shuai Zou · Lo Wu, CN
• Weixu Long · Suzhou, CN
• Xusheng Wang · 安丰镇, CN
• Guoqiang Xing · Plano, US

Key dates

• Filing date: Dec 31, 2015
• Grant date: May 8, 2018
• Expiry date: Dec 31, 2035

Classification

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

Abstract

A process for preparing a passivated emitter rear contact solar cell, which includes the steps as follows: removing the damaged layer on the surface of the silicon wafer and at the same time polishing both surfaces, texturing, forming PN junction, etching, removing the glass impurity, depositing a passivation film on the back surface, depositing a passivating antireflective layer on the front surface, making local openings on the back surface, screen printing of metal paste on both the front surface and the back surface and sintering, in which the texturing step employs a catalytic metal etching approach, and the textured structure is a nanometer-level textured structure. The present invention has combined removing the damaged layer on the surface of the silicon wafer and polishing both the front and back surfaces into one single step, and thus has simplified the production process and reduced the production cost.