HgCdTe APD-focal plane array performance at DEFIR
In: SPIE Proceedings, 2009-05-01
Online
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Zugriff:
The optimization of HgCdTe avalanche-photo-diodes (e-APD) and focal plane arrays (FPA) are reported. The gain performances was measured in planar homo-junction APDs with Cd compositions between xCd=0.3 to 0.41. Exponentially increasing gain, synonym of exclusive electron multiplication, was observed in all the devices up to M>100. The high gain at high xCd opens the path to thermo-electric cooled active imaging at T=200K. This perspective is corroborated by the demonstration of high gains and low excess noise factor F=1.2 in extrinsically doped MW-APDs, which enables reduced dark-current at high temperatures. The equivalent input dark current (Ieq_in) decreased from 200 fA to 1 fA, when the cut-off wavelength was reduced from λ c=5.2 μm to 4.1 μm at M=100 and T=80 K. This shows that sensitivity can be optimized by increasing xCd, at the cost of increased reverse bias. A new horizontal-gain-well (HGW) hetero-structure was processed to optimize the sensitivity at high gain and low bias. The first HGW-APDs had gains comparables with MW e-APDs and 50 times lower dark-current at T=200 K. They did also display surprisingly high quantum efficiency in the MWIR range, ηpeak=30%, which enables thermal imaging at high operating temperature. The high performance of MW-APDs was confirmed by the characterizations of a first 320x256 30μm pitch APD-FPA, yielding a 99.8 % operability, low gain dispersion (
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HgCdTe APD-focal plane array performance at DEFIR
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Autor/in / Beteiligte Person: | Mollard, Laurent ; Rothman, Johan ; Tribolet, Philip ; Pistone, Frédéric ; Chamonal, Jean-Paul ; Gout, Sylvain ; Ballet, P. ; Fournier, M. ; Eric De Borniol ; Lefoule, Xavier ; Courtas, Solène ; Destefanis, Gérard |
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Zeitschrift: | SPIE Proceedings, 2009-05-01 |
Veröffentlichung: | SPIE, 2009 |
Medientyp: | unknown |
ISSN: | 0277-786X (print) |
DOI: | 10.1117/12.819320 |
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