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Proceedings Paper

Development of a 128 X 4 HgCdTe hybrid FPAs using MBE grown on GaAs
Author(s): Gehong Zeng; Junhong Su
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Paper Abstract

A hybrid HgCdTe 128 X 4 FPA for LWIR detection was fabricated. HgCdTe epilayers were grown on GaAs substrates by MBE. The n+ on p photodiodes were formed by boron ion implantation. The detector array was passivated with a combination of CdTe and ZnS layers to provide a harmonious transit range between HgCdTe surface and passivation layers. And the combination layers of CdTe and ZnS present a low charge densities and very good electrical properties. The mean product of zero bias differential resistance and area for the diode array was measured to be 3 (Omega) -cm2 with a cutoff wavelength of 10.05 micrometers . TDI CCD readout circuits designed and fabricated especially for this 128 X 4 LWIR FPA with charge capacity of 1 to 1.5 X 107 electrons. This shows the characteristics of HgCdTe detector array of the epilayers grown by MBE on GaAs substrates, and also indicates than n+ p junction formation process and the surface passivation procedure are useful in the fabrication of HgCdTe FPAs.

Paper Details

Date Published: 11 August 1998
PDF: 4 pages
Proc. SPIE 3553, Detectors, Focal Plane Arrays, and Imaging Devices II, (11 August 1998); doi: 10.1117/12.318069
Show Author Affiliations
Gehong Zeng, Kunming Institute of Physics (China)
Junhong Su, Kunming Institute of Physics (China)

Published in SPIE Proceedings Vol. 3553:
Detectors, Focal Plane Arrays, and Imaging Devices II
Pingzhi Liang; Marc Wigdor; William G. D. Frederick, Editor(s)

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