EFFECT OF FERMI LEVEL MOTION ON ESR AND OPTICAL-PROPERTIES OF CUALS2

被引：38

作者：

AKSENOV, I ^{[1
]}

SATO, K ^{[1
]}

机构：

[1] TOKYO UNIV AGR & TECHNOL,FAC ENGN,KOGANEI,TOKYO 184,JAPAN

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1992年 / 31卷 / 08期

关键词：

CUALS2 TERNARY SEMICONDUCTOR; IRON AND CHROMIUM TRANSITION ION IMPURITIES; OPTICAL ABSORPTION SPECTRUM; ESR SPECTRUM; FERMI LEVEL;

D O I：

10.1143/JJAP.31.2352

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Optical absorption and electron spin resonance (ESR) spectra have been studied in as-grown, Cr-doped, and annealed in different atmospheres CuAlS2 crystals. It has been found that the major influence on the optical and ESR properties of CuAlS2 crystals, obtained by chemical vapour transport, arises from the transition ions Fe3+ and Cr2+, which are present in the crystal lattice as residual impurities. Thermal treated crystals exhibit drastic changes in their absorption and ESR spectra depending on the annealing atmosphere, which is explained by the process of the Fermi level motion in the vicinity of the Fe2+/Fe3+ and Cr+/Cr2+ demarcation levels. The results obtained show that the valence states of Fe and Cr ions and their relative amounts in each valence state are controlled by the position of the Fermi level in the band gap of the host crystal, and are stoichiometry on dependent.

引用

页码：2352 / 2358

页数：7

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