4.6 Article

Enhanced light absorption in thin-film solar cells with light propagation direction conversion

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OPTICS EXPRESS
卷 21, 期 9, 页码 A539-A547

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OPTICAL SOC AMER
DOI: 10.1364/OE.21.00A539

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Enhancement of optical absorption in thin-film solar cells (TF-SCs) has been the long-lasting issue to achieve high efficiencies. Grating couplers have been studied for the conversion of incident light into guided modes propagating along TF-SCs to extend optical path for higher optical absorption. However the wavelength band for the efficient conversion remained relatively narrow and the overall improvement of TF-SC efficiencies has been limited. This paper demonstrates that the grating height design as well as the phase matching condition is important for the enhancement of optical absorption in TF-SCs with the calculation of short-circuit currents as a figure of merit for optimization. The influence of the light absorption coefficients and grating coupling strengths on the light absorption bandwidth is also discussed. (C) 2013 Optical Society of America

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