Photonic crystal, backside reflector structure, silicon solar cell, optical path length, light trapping, distributed Bragg reflector, photoactive region, quantum efficiency
Photonic microstructures used in conjunction with thin film silicon solar cells
Light trapping in absence of electron/hole pair recombination from presence of p-n junction in silicon
We present a photonic crystal coupled to the photoactive region of a solar cell, wherein the photonic crystal includes a distributed Bragg reflector (DBR) for trapping light. The DBR grating can be developed using a practical fabrication process for silicon grating DBRs with CMOS compatibility on a silicon substrate. This photonic microstructure is used in conjunction with thin film silicon solar cells in order to enhance cell efficiency. This structure increases the optical path length of escaping photons by creating anomalous refraction effects.
U.S. Patent No. 7,482,532, issued January 27, 2009
Last revised:November 5, 2010
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