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Proceedings Paper

Pretreatment for surface leakage current reduction in type-II superlattice MWIR photodetectors
Author(s): H. Inada; K. Machinaga; S. B.; K. Miura; Y. Tsuji; M. Migita; Y. Iguchi; H. Katayama; M. Kimata
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Paper Abstract

Focal plane array based on InAs/GaSb type-II superlattice (T2SL) is expected as an alternative to HgCdTe. To get more competitive performance of T2SL detector, we need building up more reliable fabrication process. Especially, mesa formation and passivation with understanding of surface leakage mechanism is critical issue. Generally, the existence of dangling bonds at crystal surface or damaged layer and native oxides on etched mesa sidewall leads to surface leakage currents, which mostly degrade the detector performance. Many researchers adopted SiO2 film as an effective passivation layer, which was deposited by plasma enhanced chemical vapor deposition at low temperature. However, good passivation requires not only stable film, but also an effective surface treatment before passivation. There are few reports, which discuss the relation between treatment before passivation and device characteristics in T2SL photodetectors. In this work, we present dry etching mesa formation and the effect of pretreatment of passivation on T2SL p-i-n photodetector fabrication. We investigate R0A-Perimeter/Area relation and R0A temperature dependence with in-situ plasma treatment prior to the passivation. From results of electrical characterization and interface analysis using STEM, it is recognized that in-situ N2 plasma treatment was effective to surface leakage reduction.

Paper Details

Date Published: 24 June 2014
PDF: 6 pages
Proc. SPIE 9070, Infrared Technology and Applications XL, 90700Z (24 June 2014); doi: 10.1117/12.2053190
Show Author Affiliations
H. Inada, Sumitomo Electric Industries, Ltd. (Japan)
K. Machinaga, Sumitomo Electric Industries, Ltd. (Japan)
S. B., Sumitomo Electric Industries, Ltd. (Japan)
K. Miura, Sumitomo Electric Industries, Ltd. (Japan)
Y. Tsuji, Sumitomo Electric Industries, Ltd. (Japan)
M. Migita, Sumitomo Electric Industries, Ltd. (Japan)
Y. Iguchi, Sumitomo Electric Industries, Ltd. (Japan)
H. Katayama, Japan Aerospace Exploration Agency (Japan)
M. Kimata, Ritsumeikan Univ. (Japan)
Japan Aerospace Exploration Agency (Japan)

Published in SPIE Proceedings Vol. 9070:
Infrared Technology and Applications XL
Bjørn F. Andresen; Gabor F. Fulop; Charles M. Hanson; Paul R. Norton, Editor(s)

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