Modulated photonic-crystal structures as broadband back reflectors in thin-film solar cells

Journal article (2009)

Authors

J Krc Electrical Power Processing

M. Zeman Photovoltaic Materials and Devices -

SL Luxembourg Electronic Components, Technology and Materials -

M Topic External organisation

Research Group

Electrical Power Processing

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Published Date

2009

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Research Group

Electrical Power Processing

Abstract

A concept of a modulated one-dimensional photonic-crystal (PC) structure is introduced as a back reflector for thin-film solar cells. The structure comprises two PC parts, each consisting of layers of different thicknesses. Using layers of amorphous silicon and amorphous silicon nitride a reflectance close to 100% is achieved over a broad wavelength region (700¿1300 nm). Based on this concept, a back reflector was designed for thin-film microcrystalline silicon solar cells, using n-doped amorphous silicon and ZnO:Al. Simulations show that the short-circuit current of the cell with a modulated PC back reflector closely resembles that of a cell with an ideal reflector. ©2009 American Institute of Physics