Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3039787
Keywords
current density; diffraction gratings; distributed Bragg reflectors; elemental semiconductors; light absorption; photonic crystals; reflectivity; silicon; solar cells; thin film devices
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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 mu m thick monocrystalline thin film Si solar cells integrated with TPC were fabricated through an active layer transfer technique. Measured short circuit current density J(sc) was increased by 19%, compared to a theoretical prediction of 28%.
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