Cd(0.85)Mg(0.15)Se混合晶体的光学特性

Optical characterization of a Cd(0.85)Mg(0.15)Se mixed crystal.

作者信息

Huang P J, Huang Y S, Firszt F, Lęgowski S, Męczyńska H, Tiong K K

机构信息

Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.

出版信息

J Phys Condens Matter. 2007 Jul 4;19(26):266002. doi: 10.1088/0953-8984/19/26/266002. Epub 2007 May 24.

DOI:10.1088/0953-8984/19/26/266002

PMID:21694071

Abstract

We present an optical characterization of a Bridgman-grown wurtzite-type Cd(0.85)Mg(0.15)Se mixed crystal in the near-band-edge interband transitions using temperature-dependent contactless electroreflectance (CER) and photoreflectance (PR) in the temperature range 15-400 K. The interband excitonic transitions A and C originating from the band edge and spin-orbital splitting critical points of the sample, respectively, have been observed in the CER/PR spectra. The transition energies and broadening function of the excitonic features are determined via a lineshape fit to the CER/PR spectra. The parameters that describe the temperature dependence of the transition energies of excitons A and C, and the broadening function of exciton A, are evaluated and discussed.

摘要

我们利用温度范围为15 - 400 K的变温非接触电反射（CER）和光反射（PR）技术，对布里奇曼法生长的纤锌矿型Cd(0.85)Mg(0.15)Se混合晶体在近带边带间跃迁进行了光学表征。在CER/PR光谱中分别观察到了源于样品带边和自旋轨道分裂临界点的带间激子跃迁A和C。通过对CER/PR光谱进行线形拟合，确定了激子特征的跃迁能量和展宽函数。对描述激子A和C跃迁能量的温度依赖性以及激子A展宽函数的参数进行了评估和讨论。