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Proceedings Paper

Numerical simulation of quantum efficiency and surface recombination in HgCdTe IR photon-trapping structures
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Paper Abstract

We have investigated the quantum effiency in HgCdTe photovoltaic pixel arrays employing a photon-trapping structure realized with a periodic array of pillars intended to provide broadband operation. We have found that the quantum efficiency depends heavily on the passivation of the pillar surface. Pillars passivated with anodicoxide have a large fixed positive charge on the pillar surface. We use our three-dimensional numerical simulation model to study the effect of surface charge and surface recombination velocity on the exterior of the pillars. We then evaluate the quantum efficiency of this structure subject to different surface conditions. We have found that by themselves, the surface charge and surface recombination are detrimental to the quantum efficiency but the quantum efficiency is recovered when both phenomena are present. We will discuss the effects of these phenomena and the trade offs that exist between the two.

Paper Details

Date Published: 18 June 2013
PDF: 8 pages
Proc. SPIE 8704, Infrared Technology and Applications XXXIX, 87042Q (18 June 2013); doi: 10.1117/12.2016496
Show Author Affiliations
Jonathan Schuster, Boston Univ. (United States)
Enrico Bellotti, Boston Univ. (United States)

Published in SPIE Proceedings Vol. 8704:
Infrared Technology and Applications XXXIX
Bjørn F. Andresen; Gabor F. Fulop; Charles M. Hanson; Paul R. Norton; Patrick Robert, Editor(s)

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