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* [http://link.springer.com/content/pdf/10.1007%2Fs12274-010-0064-y.'''Effects of nanostructured back reflectors on the external quantum efficiency in thin film solar cells.'''].<ref>C. Hsu, G. F. Burkhard, M. D. McGehee, and Y. Cui, "Effects of nanostructured back reflectors on the external quantum efficiency in thin film solar cells," Nano Research, vol. 4, no. 2, pp. 153–158, Nov. 2010.</ref> | * [http://link.springer.com/content/pdf/10.1007%2Fs12274-010-0064-y.'''Effects of nanostructured back reflectors on the external quantum efficiency in thin film solar cells.'''].<ref>C. Hsu, G. F. Burkhard, M. D. McGehee, and Y. Cui, "Effects of nanostructured back reflectors on the external quantum efficiency in thin film solar cells," Nano Research, vol. 4, no. 2, pp. 153–158, Nov. 2010.</ref> | ||
""Abstract:'''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 | 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. | device geometry is a useful archetype for investigating absorption enhancement by nanostructures. |