Structural, optical and Urbach energy properties of ITO/CdS and ITO/ZnO/CdS bi-layer thin films

被引：20

作者：

Nagaraja, M. ^{[1
]}

Raghu, P. ^{[2
]}

Mahesh, H. M. ^{[3
]}

Pattar, Jayadev ^{[4
]}

机构：

[1] Sri Siddhartha Acad Higher Educ, SSIT, Dept Phys, Tumakuru 572107, India

[2] Govt First Grade Coll Kuvempunagar, Dept Elect, Mysore 570023, Karnataka, India

[3] Bangalore Univ, Dept Elect Sci, Bengaluru 560056, India

[4] REVA Univ, Sch Phys, Bengaluru 560064, India

来源：

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS | 2021年 / 32卷 / 07期

关键词：

27;

D O I：

10.1007/s10854-021-05568-4

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The thin films of ITO/CdS and ITO/ZnO/CdS bi-layer have been fabricated and studied for structural, morphological, optical, and Urbach energy properties. ZnO thin films were coated onto ITO plated glass slides by a spin-coating method and CdS thin films by electron beam evaporation method. X-Ray Diffraction patterns of both ITO/CdS and ITO/ZnO/CdS thin films confirmed the hexagonal wurtzite structure of ZnO and hexagonal structure of CdS, respectively. AFM images show better uniformity and bigger grain size in the case of OTO/ZnO/CdS samples. Optical transmittance spectra show a slight redshift (similar to 493 nm to similar to 505 nm) for the film ITO/ZnO/CdS compared to ITO/CdS. Urbach energy was calculated for all the samples to study the structural imperfections leading to the band tails. A decrease in Urbach energy is observed for ITO/ZnO/CdS compared to ITO/CdS. The obtained results indicate that the ITO/ZnO/CdS thin films are more suitable for optoelectronic devices compared to ITO/CdS films. The results obtained are discussed in detail and presented in this paper.

引用

页码：8976 / 8982

页数：7

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