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Textured micrometer scale templates as light managing fabrication platform for organic solar cells

United States Patent

July 26, 2016
View the Complete Patent at the US Patent & Trademark Office
A three-dimensional, microscale-textured, grating-shaped organic solar cell geometry. The solar cells are fabricated on gratings to give them a three-dimensional texture that provides enhanced light absorption. Introduction of microscale texturing has a positive effect on the overall power conversion efficiency of the devices. This grating-based solar cell having a grating of pre-determined pitch and height has shown improved power-conversion efficiency over a conventional flat solar cell. The improvement in efficiency is accomplished by homogeneous coverage of the grating with uniform thickness of the active layer, which is attributed to a sufficiently high pitch and low height of the underlying gratings. Also the microscale texturing leads to suppressed reflection of incident light due to the efficient coupling of the incident light into modes that are guided in the active layer.
Chaudhary; Sumit (Ames, IA), Ho; Kai-Ming (Ames, IA), Park; Joong-Mok (Ames, IA), Nalwa; Kanwar Singh (Hillsboro, OR), Leung; Wai Y. (Ames, IA)
Iowa State University Research Foundation, Inc. (Ames, IA)
13/ 223,351
September 1, 2011
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT This invention was made in part with Government support under Grant Number DE-AC02-07CH11358 awarded by the Department of Energy. The Government has certain rights in this invention.