Investigation of temperature dependent optical modes in GexAs35 - xSe65 thin films: Structure specific Raman, FIR and optical absorption spectroscopy

THIN SOLID FILMS

卷:621

Article

Khan, Pritam¹  Bhattacharya, Arinjoy¹  Joshy, Abin¹  Sathe, Vasant²  Deshpande, Uday²  Adarsh, K. V.¹ 

[1] Indian Inst Sci Educ & Res, Dept Phys, Bhopal 462023, India

[2] UGC DAE Consortium Sci Res, Univ Campus,Khandwa Rd, Indore 452017, Madhya Pradesh, India

关键词: Thin films;    Raman spectroscopy and scattering;    Infrared spectroscopy (IR);    Optical materials;    Chalcogenides;    Amorphous materials;   

DOI  :  10.1016/j.tsf.2016.11.037

来源: Elsevier

【 摘 要 】

In this article, we quest for understanding the temperature dependent optical modes present in a-GexAs35-xSe65 thin films. Strikingly, temperature dependent Raman spectra provide direct evidence of softening of AsSe3/2 pyramidal units and Se clusters at higher temperatures. In a stark contrast, GeSe4/2 corner and edge sharing tetrahedral units remain rigid against the temperature variation. Subsequently, FIR measurements at room temperature also provide significant insights on the optical modes in consistent with Raman data. In addition to that, our experimental results present fascinating optical features-thermally and compositionally tunable optical absorption spectra. We found that structural and optical parameters are closely related and help us in understanding the various physico-chemical properties which can eventually contribute to the field of optics and optoelectronics. (C) 2016 Published by Elsevier B.V.

【 授权许可】

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