Temperature Dependence of Optical Reflection Spectra of Cuinse2 Single Crystals with the Chalcopyrite Structure

IF 0.8 4区化学 Q4 SPECTROSCOPY Journal of Applied Spectroscopy Pub Date : 2024-07-05 DOI:10.1007/s10812-024-01754-4

O. M. Borodavchenko, V. D. Zhivulko, I. D. Myalik, A. V. Mudryi, M. V. Yakushev

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Abstract

Resonances of free excitons at energies A ~ 1.0409 eV, B ~ 1.0445 eV, and C ~ 1.2690 eV were detected in reflection spectra of single crystals of the direct-gap compound CuInSe₂ at a temperature of 8.6 K. The appearance of the three reflection resonances A, B, and C could be explained by removal of degeneracy from valence-band energy levels due to the influence of crystal field and spin–orbit interaction on the tetragonal lattice of CuInSe₂ with Δ_CF ~ 5.4 meV and Δ_SO ~ 224 meV. Measurements of the temperature dependence of the reflection spectra in the range 8.6–90 K showed the energies of free-exciton resonances A and B increased because of deformation of the unit cell (tetragonal stretching) of the CuInSe₂ lattice with the chalcopyrite structure. The binding energies of free excitons A and B were determined as 10.7 and 152 meV based on temperature quenching of exciton resonances A ~ 1.0409 eV and B ~ 1.0445 eV

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具有黄铜矿结构的 Cuinse2 单晶的光学反射光谱的温度依赖性

在温度为 8.6 K 的直接隙化合物 CuInSe2 单晶体的反射光谱中检测到了能量分别为 A ~ 1.0409 eV、B ~ 1.0445 eV 和 C ~ 1.2690 eV 的自由激子共振。由于晶体场和自旋轨道相互作用对 CuInSe2 四方晶格（ΔCF ~ 5.4 meV 和 ΔSO ~ 224 meV）的影响，价带能级的退行性被消除，这可以解释 A、B 和 C 三个反射共振的出现。在 8.6-90 K 范围内对反射光谱温度依赖性的测量表明，由于黄铜矿结构的 CuInSe2 晶格的单胞变形（四方伸展），自由激子共振 A 和 B 的能量增加。根据激子共振 A ~ 1.0409 eV 和 B ~ 1.0445 eV 的温度淬灭，确定自由激子 A 和 B 的结合能分别为 10.7 和 152 meV。

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来源期刊

Journal of Applied Spectroscopy SPECTROSCOPY-

CiteScore

1.30

自引率

14.30%

发文量

145

审稿时长

2.5 months

期刊介绍： Journal of Applied Spectroscopy reports on many key applications of spectroscopy in chemistry, physics, metallurgy, and biology. An increasing number of papers focus on the theory of lasers, as well as the tremendous potential for the practical applications of lasers in numerous fields and industries.