Optical band gap of Sn0.2Bi1.8Te3 thin films

Bulletin of Materials Science

关键词: Thin films;    band gap;    optical absorbance;    film thickness;    size effect.;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Sn0.2Bi1.8Te3 thin films were grown using the thermal evaporation technique on a (001) face of NaCl crystal as a substrate at room temperature. The optical absorption was measured in the wave number range 500–4000 cm-1. From the optical absorption data the band gap was evaluated and studied as a function of film thickness and deposition temperature. The data indicate absorption through direct interband transition with a band gap of around 0.216 eV. The detailed results are reported here.

【 授权许可】

CC BY