Research Article

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2011, 4(2): 153–158

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https://doi.org/10.1007/s12274-010-0064-y

Effects of Nanostructured Back Reflectors on the External Quantum Efficiency in Thin Film Solar Cells

Chingmei Hsu1, George F. Burkhard2, Michael D. McGehee1, and Yi Cui1 ()

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1 Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA
2 Department of Applied Physics, Stanford University, Stanford, California 94305, USA

Keywords: Solar cells, back reflector, scattering, solar energy, amorphous silicon
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  • Abstract
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Hydrogenated amorphous Si (α-Si:H) is a promising material for photovoltaic applications due to its low cost, high abundance, long lifetime, and non-toxicity. We demonstrate a device designed to investigate the effect of nanostructured back reflectors on quantum efficiency in photovoltaic devices. We adopt a superstrate configuration so that we may use conventional industrial light trapping strategies for thin film solar cells as a reference for comparison. We controlled the nanostructure parameters via a wafer-scale self-assembly technique and systematically studied the relation between nanostructure size and photocurrent generation. The gain/loss transition at short wavelengths showed red-shifts with decreasing nanostructure scale. In the infrared region the nanostructured back reflector shows large photocurrent enhancement with a modified feature scale. This device geometry is a useful archetype for investigating absorption enhancement by nanostructures.
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Effects of Nanostructured Back Reflectors on the External Quantum Efficiency in Thin Film Solar Cells. Nano Res. 2011, 4(2): 153–158 https://doi.org/10.1007/s12274-010-0064-y

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