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Photovoltaic cell and production thereof

United States Patent

July 22, 2008
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
An efficient photovoltaic cell, and its process of manufacture, is disclosed wherein the back surface p-n junction is removed from a doped substrate having an oppositely doped emitter layer. A front surface and edges and optionally the back surface periphery are masked and a back surface etch is performed. The mask is not removed and acts as an anti-reflective coating, a passivating agent, or both. The photovoltaic cell retains an untextured back surface whether or not the front is textured and the dopant layer on the back surface is removed to enhance the cell efficiency. Optionally, a back surface field is formed.
Narayanan; Srinivasamohan (Gaithersburg, MD), Kumar; Bikash (Bangalore, IN)
BP Corporation North America Inc. (Warrenville, IL)
10/ 767,625
January 28, 2004
This invention was made with Government support under NREL Subcontract # ZAX-8-17647-05; Prime Contract # DE-AC36-83CH10093 awarded by the Department of Energy. The Government has certain rights in this invention.