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Proceedings Paper

Minority carrier lifetime characteristics in type II InAs/GaSb LWIR superlattice n+πp+ photodiodes
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Paper Abstract

In this work the current versus voltage data of a p-n+ junction is converted into minority carrier lifetime data. Space charge recombination currents dominate at modest reverse bias at 80K and taking the dominant recombination centers to be located at the intrinsic Fermi level, the lowest minority carrier lifetime τ0 is determined to be 35ns. This single Shockley-Read-Hall carrier recombination parameter provides an excellent fit to the data over temperature range 40K≤ T≤ 130K; the 35ns minority carrier lifetime also explains the quantum efficiency data. The transition from diffusion to space charge currents occurs for temperatures, T ≤ 100K. For T≤ 40K trap assisted tunneling is the dominant current component. Based on imaging system requirements to be near background limited for photon flux ≈ 1015 ph/cm2-s and detector temperature of 80K, the minority carrier lifetime will need to be increased by one order of magnitude.

Paper Details

Date Published: 7 May 2009
PDF: 10 pages
Proc. SPIE 7298, Infrared Technology and Applications XXXV, 72981U (7 May 2009); doi: 10.1117/12.819641
Show Author Affiliations
J. Pellegrino, U.S. Army Night Vision & Electronic Sensors Directorate (United States)
R. DeWames, U.S. Army Night Vision & Electronic Sensors Directorate (United States)


Published in SPIE Proceedings Vol. 7298:
Infrared Technology and Applications XXXV
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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