NDLI: Advanced methods for preparation and characterization of infrared detector materials

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Advanced methods for preparation and characterization of infrared detector materials

Content Provider	NASA Technical Reports Server (NTRS)
Author	Morris, B. J. Broerman, J. G. Meschter, P. J.
Copyright Year	1983
Description	Crystals were prepared by the Bridgman-Stockbarger method with a wide range of crystal growth rates and temperature gradients adequate to prevent constitutional supercooling under diffusion-limited, steady-state, growth conditions. The longitudinal compositional gradients for different growth conditions and alloy compositions were calculated and compared with experimental data to develop a quantitative model of solute redistribution during the crystal growth of the alloys. Measurements were performed to ascertain the effect of growth conditions on radial compositional gradients. The pseudobinary HgTe-CdTe constitutional phase diagram was determined by precision differential-thermal-analysis measurements and used to calculate the segregation coefficient of Cd as a function of x and interface temperature. Experiments were conducted to determine the ternary phase equilibria in selected regions of the Hg-Cd-Te constitutional phase diagram. Electron and hole mobilities as functions of temperature were analyzed to establish charge-carrier scattering probabilities. Computer algorithms specific to Hg(1-x)CdxTe were developed for calculations of the charge-carrier concentration, charge-carrier mobilities, Hall coefficient, and Dermi Fermi energy as functions of x, temperature, ionized donor and acceptor concentrations, and neutral defect concentrations.
File Size	2577422
Page Count	29
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19830022000
Archival Resource Key	ark:/13960/t0tr0r416
Language	English
Publisher Date	1983-02-15
Access Restriction	Open
Subject Keyword	Solid-state Physics Infrared Detectors Crystal Growth Mercury Cadmium Tellurides Charge Carriers Algorithms Hole Mobility Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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