Edge deletion of thin-layer solar modules by etching

US8497215B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Oliver Doll · Dietzenbach, DE
• Ingo Koehler · Darmstadt, DE

Key dates

• Filing date: Aug 5, 2009
• Grant date: Jul 30, 2013
• Expiry date: Oct 23, 2029

Classification

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

Abstract

The present invention relates to a method for the wet-chemical edge deletion of solar cells. An etching paste is applied to the edge of a solar cell substrate surface and after the reaction is complete, the paste residue is removed. Optionally, the substrate surface is cleaned and dried. The etching paste comprises 85% H3PO4, NH4HF2 and 65% HNO3 in a ratio in the range from 7:1:1.5 to 10:1:3.5, based on the weight.