Accession Number : ADA326160
Title : InTISb for Long-Wavelength Infrared Photodetectors and Arrays.
Descriptive Note : Final rept.,
Corporate Author : NORTHWESTERN UNIV EVANSTON IL CENTER FOR QUANTUM DEVICES
Personal Author(s) : Razeghi, Manijeh
PDF Url : ADA326160
Report Date : 1997
Pagination or Media Count : 22
Abstract : The objective of this research program is to grow InTlSb alloys for long wavelength infrared detector applications by low pressure metalorganic chemical vapor deposition (LP-MOCVD) and to investigate their physical properties. As a first step towards this goal, optimum growth conditions for high quality InSb epitaxial films on InSb, GaAs, and Si substrates have been determined. InSb films grown under these conditions exhibited one of the best structural and electrical properties reported so far. For the long wavelength applications, growth of InAsSb and InTlSb was then carried out using arsine and cyclopentadienylthallium as the source for arsenic and thallium respectively. Growth of InAsSb with appropriate doping resulted in the room temperature operation of InAsSb photodetectors with extended cut-off wavelength incorporation of thallium into InSb has led to the first successful growth of InTlSb having an extended infrared response. By changing the thallium flow, thallium content was varied and the resulting absorption edge varied from 5.5 to 9.0 microns. The photoconductive detectors have been fabricated and measured using Fourier transform infrared (FTIR) spectrometer and blackbody test setup. Using the Hall data, the effective carrier lifetime and detectivity have been calculated for the InTlSb layers. The lifetime value ranged from 10 to 50 ns and detectivity was varied from 2 to 9 x l0(exp 8)cm.Hz(exp 0.5)/W at 77 K. These results demonstrate InTlSb as feasible material system for long wavelength infrared detection.
Descriptors : *INFRARED DETECTION, *EPITAXIAL GROWTH, FOURIER TRANSFORMATION, PHYSICAL PROPERTIES, HALL EFFECT, GALLIUM ARSENIDES, CHEMICAL VAPOR DEPOSITION, SUBSTRATES, ELECTRICAL PROPERTIES, DOPING, SEMICONDUCTING FILMS, PHOTODETECTORS, LONG WAVELENGTHS, BLACKBODY RADIATION, ARSENIC, INDIUM ANTIMONIDES, FOURIER SPECTROMETERS, THALLIUM ALLOYS.
Subject Categories : Mfg & Industrial Eng & Control of Product Sys
Infrared Detection and Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE