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Proceedings Paper

Room temperature photovoltaic response of split-off band infrared detectors with a graded barrier
Author(s): A. G. U. Perera; S. G. Matsik; D. P. Pitigala; Y. F. Lao; S. P. Khanna; L. H. Li; E. H. Linfield; Z. R. Wasilewski; M. Buchanan; X. H. Wu; H. C. Liu
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Paper Abstract

Split-off band detectors have been demonstrated operating at or above room temperatures. However the specific detectivity was somewhat low due to the high dark current. Increasing the barrier height can suppress the dark current at high temperatures but results in a low responsivity due to the capture of carriers in emitters. A difference between the heights of the barriers on the two sides of an emitter provides highly energized carriers injected into the emitter and hence reduces the trapping effects. Three p-GaAs/AlGaAs samples with different Al fractions in the graded barriers are used to test these effects. Due to the graded barrier, the samples have an asymmetric band structure which makes it easier for excited carriers to travel in one direction than in the other. Therefore, photovoltaic operation is possible due to the built-in potential under equilibrium. Preliminary results obtained from these samples will be discussed.

Paper Details

Date Published: 24 January 2011
PDF: 15 pages
Proc. SPIE 7945, Quantum Sensing and Nanophotonic Devices VIII, 79451I (24 January 2011); doi: 10.1117/12.870047
Show Author Affiliations
A. G. U. Perera, Georgia State Univ. (United States)
S. G. Matsik, Georgia State Univ. (United States)
D. P. Pitigala, Georgia State Univ. (United States)
Y. F. Lao, Georgia State Univ. (United States)
S. P. Khanna, Univ. of Leeds (United Kingdom)
L. H. Li, Univ. of Leeds (United Kingdom)
E. H. Linfield, Univ. of Leeds (United Kingdom)
Z. R. Wasilewski, National Research Council (Canada)
M. Buchanan, National Research Council (Canada)
X. H. Wu, National Research Council (Canada)
H. C. Liu, National Research Council (Canada)

Published in SPIE Proceedings Vol. 7945:
Quantum Sensing and Nanophotonic Devices VIII
Manijeh Razeghi; Rengarajan Sudharsanan; Gail J. Brown, Editor(s)

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