Share Email Print

Proceedings Paper

Characterization of InGaSb detectors for 1.0- to 2.4-µm applications
Author(s): Tamer F. Refaat; M. Nurul Abedin; Upendra N. Singh; Vinay Bhagwat; Ishwara B. Bhat; Partha S Dutta
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

Near infrared detectors in the 1 to 2.4 μm spectral range are important for many applications such as atmospheric remote sensing, where several species have strong absorption spectra in that range. Antimonide-based III-V compound semiconductor materials are good candidates for developing detectors in that spectral range. Electrical and optical characteristics of In1-xGaxSb p-n photodetectors at different temperatures are presented. The devices were fabricated either on bulk InGaSb substrates by zinc diffusion or InGaSb epitaxial layers grown on GaSb substrates by organo-metallic vapor phase epitaxy (OMVPE). Variable area devices were fabricated. Current-voltage measurements indicated higher dark current in InGaSb devices grown on GaSb substrate, due to defects generated by the lattice-mismatch. Spectral response measurements were obtained in the 1 to 2.4 μm wavelength range at different temperatures. At room temperature, the cut-off wavelengths were observed at 2.3 and 2.1 μm for InGaSb devices grown on GaSb and for devices fabricated on bulk InGaSb substrates respectively. Reducing the operating temperature shifts the cut-off wavelength to shorter values and increases the responsivity. Noise calculations indicated a room temperature detectivities of 3.3x1010 and 5.5x1010 cmHz1/2/W at 2 μm for the GaSb and InGaSb respectively. Detectivity variation with wavelength will be presented and compared to the background limited performance.

Paper Details

Date Published: 30 August 2004
PDF: 8 pages
Proc. SPIE 5406, Infrared Technology and Applications XXX, (30 August 2004); doi: 10.1117/12.542503
Show Author Affiliations
Tamer F. Refaat, Science and Technology Corp. (United States)
M. Nurul Abedin, NASA Langley Research Ctr. (United States)
Upendra N. Singh, NASA Langley Research Ctr. (United States)
Vinay Bhagwat, Rensselaer Polytechnic Institute (United States)
Ishwara B. Bhat, Rensselaer Polytechnic Institute (United States)
Partha S Dutta, Rensselaer Polytechnic Institute (United States)

Published in SPIE Proceedings Vol. 5406:
Infrared Technology and Applications XXX
Bjorn F. Andresen; Gabor F. Fulop, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?