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Cs3Cu2I5晶体薄膜吸收谱的研究
引用本文:孙家林,国清华,吴源,李师群.Cs3Cu2I5晶体薄膜吸收谱的研究[J].光谱学与光谱分析,1999,19(5):648-650.
作者姓名:孙家林  国清华  吴源  李师群
作者单位:1. 清华大学现代应用物理系,100084,北京
2. 中国科学院物理所,100080,北京
基金项目:国家教委回国人员科研资助,清华大学实验室开放基金
摘    要:本文测定了Cs3Cu2 I5 晶体薄膜在室温及液氮温度下的吸收谱,并依此计算出该材料的激子参数,即激子束缚能ΔE(1)ex = (0.53±0.07)eV,激子半径aex = 0.326 nm ,禁带宽度Eg = (5.00±0.07)eV。在谱分析的基础上,论证了Cs3Cu2I5 的电子和激子激发定域在该晶体的CuI亚晶格之中,同时,揭示了在低温下Csx Cu1- x I系列化合物的第一激子峰位置随其摩尔组分变化的规律。

关 键 词:薄膜  吸收谱  激子

The Absorption Spectra of Crystal Thin Film Cs3Cu2I5
Jialin SUN,Qinghua GUO,Yuan WU,Shiqun LI.The Absorption Spectra of Crystal Thin Film Cs3Cu2I5[J].Spectroscopy and Spectral Analysis,1999,19(5):648-650.
Authors:Jialin SUN  Qinghua GUO  Yuan WU  Shiqun LI
Institution:Department of Modern Applied Physics, Tsinghua University, 100084 Beijing.
Abstract:In this paper we measured the absorption spectra of crystal thin film Cs3Cu2I5 at room and liquid nitrogen temperatures, respectively, and calculated the excitonic coefficient of the material. The excitonic coupling energy deltaE(ex)(1) = (0.53 +/- 0.07) eV, excitonic radius a(ex) = 0. 326 nm,and forbidden zone width E(g) = (5.00 +/- 0.07) eV. The spectral analysis shows that the electron and exciton excitations of the Cs3Cu2I5 localize in the CuI subcrystal lattice, and reveals the law that governs the variance of the first excitonic peak position of the serial Cs(x)Cu(1-x) I compounds with their mol-components at low temperature.
Keywords:Thin film    Absorption spectra    Exciton  
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