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Enhanced quantum efficiency of Ge solar cells by a two-dimensional photonic crystal nanostructured surface

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6 Author(s)
Prieto, I. ; Instituto de Microelectrónica de Madrid, Centro Nacional de Microelectrónica, Consejo Superior de Investigaciones Científicas, Isaac Newton 8, PTM Tres Cantos, 28760 Madrid, Spain ; Galiana, B. ; Postigo, P.A. ; Algora, C.
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A single-junction germanium solar cell with a photonic crystal nanostructured surface has been developed. The solar cell comprises a Ge p-n junction and an InGaP window layer. The InGaP window layer has been nanopatterned with an extended photonic crystal structure consisting on a triangular lattice of holes with submicronic sizes. Enhancements of the external quantum efficiency of 22% for a wide range of wavelengths and up to a 46% for specific wavelengths have been measured, which implies an increase in photocurrent between 11% and 22%. A clear correlation with the area of photonic crystal patterned has been observed.

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Applied Physics Letters  (Volume:94 ,  Issue: 19 )