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

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 c...

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Veröffentlicht in:Journal of applied physics 2013-12, Vol.114 (21)
Hauptverfasser: Gemain, F., Robin, I. C., Feuillet, G.
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4840895