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

Prieto, I.; Galiana, B.; Postigo, P. A.; Algora, C.; Martínez, L. J.; Rey-Stolle, I.
May 2009
Applied Physics Letters;5/11/2009, Vol. 94 Issue 19, p191102
Academic Journal
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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