Composition dependence of the mercury vacancies energy levels in HgCdTe: Evolution of the 'negative-U' property

Autor:	Guy Feuillet, Ivan-Christophe Robin, F. Gemain
Rok vydání:	2013
Předmět:	Cadmium Photoluminescence Materials science Condensed matter physics business.industry Annealing (metallurgy) Analytical chemistry General Physics and Astronomy chemistry.chemical_element Epitaxy Acceptor Semiconductor chemistry Hall effect Vacancy defect business
Zdroj:	Journal of Applied Physics. 114:213706
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.4840895
Popis:	HgCdTe films grown by liquid phase epitaxy with different Cd compositions were post-annealed to control the Hg vacancy concentration. Then temperature-dependent Hall measurements and photoluminescence measurements allowed us to study the evolution of the Hg vacancy acceptor levels with the cadmium composition. For Cd compositions below 33% the Hg vacancies in HgCdTe present a negative-U property with the ionized state V− stabilized compared to the neutral state V0. For Cd compositions higher than 45%, the Hg vacancies in HgCdTe present a more standard level ordering with the ionized state V− at higher energy than the neutral state V0.
Databáze:	OpenAIRE
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