Demonstration of enhanced absorption in thin film Si solar cells with textured photonic crystal back reflector

Zeng, L.; Bermel, P.; Yi, Y.; Alamariu, B. A.; Broderick, K. A.; Liu, J.; Hong, C.; Duan, X.; Joannopoulos, J.; Kimerling, L. C.
December 2008
Applied Physics Letters;12/1/2008, Vol. 93 Issue 22, p221105
Academic Journal
Herein the authors report the experimental application of a powerful light trapping scheme, the textured photonic crystal (TPC) backside reflector, to thin film Si solar cells. TPC combines a one-dimensional photonic crystal as a distributed Bragg reflector with a diffraction grating. Light absorption is strongly enhanced by high reflectivity and large angle diffraction, as designed with scattering matrix analysis. 5 μm thick monocrystalline thin film Si solar cells integrated with TPC were fabricated through an active layer transfer technique. Measured short circuit current density Jsc was increased by 19%, compared to a theoretical prediction of 28%.


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