Theoretical Investigation of Point Defects of Mercury Cadmium Telluride.
Abstract
We have investigated a number of electronic properties related to point defects in the Hg(1-x)Cdx Te alloy system. A detailed calculation for the electronic starter for mercury vacancies was carried out and we found those mercury vacancies are shallow double acceptors. Both the first and second ionization energies are calculated for the whole range of alloy composition. The theoretical results are consistent with current experimental data. But more conclusive and accurate data are required. We have investigated other native point defects as well, interesting qualitative conclusions were reached. We have looked into the substitutional disorder in Hg(1-x)CdxTe alloy system. An empirical pseudopotential theory for alloy fluctuation potential in this case was proposed. We have applied the theory to study the band gap bowing, and level broadening of shallow donors and acceptor, as well as bound excitons. The theoretical results agrees well with the only available data from bound exciton broadening and from band gap bowing in Hg(1-x)Cdx Te. Nonparabolic effects in a narrow band gap Hg(1-x)Cdx Te were also investigated. Interesting results on energy level of shallow donors and transport properties are reported.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1985
- Accession Number
- ADA163735
Entities
People
- Dee-son Pan
Organizations
- University of California, Los Angeles