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DIFFUSE OMNI-DIRECTIONAL BACK REFLECTORS AND METHODS OF MANUFACTURING THE SAME

United States Patent Application

20120319223
A1
View the Complete Application at the US Patent & Trademark Office
Ultra-high reflectivity is projected for internal reflectors comprised of a metal film and nanostructured transparent conductive oxide (TCO) bi-layer on the back side of a semiconductor device. Oblique-angle deposition can be used to fabricate indium tin oxide (ITO) and other TCO optical thin-film coatings with a porous, columnar nanostructure. The resulting low-n dielectric films can then be employed as part of a conductive omni-directional reflector (ODR) structure capable of achieving high internal reflectivity over a broad spectrum of wavelengths and a wide range of angles. In addition, the dimensions and geometry of the nanostructured, low-n TCO films can be adjusted to enable diffuse reflections via Mie scattering. Diffuse ODR structures enhance the performance of light trapping and light guiding structures in photonic devices.
Welser, Roger E. (Providence, RI), Sood, Ashok K. (Brookline, MA)
MAGNOLIA SOLAR, INC. (Woburn MA)
13/ 528,581
June 20, 2012
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] This invention was made with U.S. government support under Grant Number NNX11CE59P, awarded by the National Aeronautics and Space Administration (NASA) and Grant Number ERDA1-0000021389 awarded by the New York State Energy Research and Development Authority (NYSERDA). The government may have certain rights in this invention.