Patent Number: 7,786,376

Title: High efficiency solar cells and manufacturing methods

Abstract: A Schottky contact photovoltaic energy conversion cell. The Schottky contact photovoltaic energy conversion cell comprises a flexible substrate and a first array of a plurality of closely-spaced microscale pillars connected to a first electrical cell contact. The pillars and the contact are formed of (or having a top) layer of a first Schottky metal material with a work function selected for efficiently collecting photogenerated electrons. The Schottky contact photovoltaic energy conversion cell further comprises a second array of a plurality of closely-spaced microscale pillars connected to a second electrical cell contact. The pillars and the contact are formed of (or having a top) layer of a second Schottky metal material with a work function selected for efficiently collecting photogenerated holes. The Schottky contact photovoltaic energy conversion cell further comprises a semiconductor absorber thin-film layer covering the first and second contacts and filling spaces among all the pillars, for creating photogenerated electrons and holes.

Inventors: Nag; Somnath (Saratoga, CA), Moslehi; Mehrdad (Los Altos, CA)

Assignee: Solexel, Inc.

International Classification: H01L 31/04 (20060101); H01L 21/00 (20060101)

Expiration Date: 8/31/12018