Singh, Om Pal and Vijayan, N. and Sood, K. N. and Singh, B. P. and Singh, V. N. (2015) Controlled substitution of S by Se in reactively sputtered CZTSSe thin films for solar cells. Journal of Alloys and Compounds , 648. pp. 595-600. ISSN 0925-8388

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CZTSSe thin films are considered to be future of flexible thin film solar cell. Amount of S and Se in the CZTSSe thin films controls the band gap. Therefore, control over the concentration of S/Se is very important for enhancing the efficiency. CZTS thin films were deposited on SLG substrate by sequential reactive sputtering of metal targets. The films were annealed in Se atmosphere at 550 degrees C for 10-25 min in order to obtain CZTSSe thin films. Elemental, surface morphological, optical and structural properties of CZTSSe thin films have been investigated in detail. Optical band gap energy of CZTSSe thin films were in the range of 1.1-1.35 eV. XRD and Raman analysis were used to analyze the structure and phase purity of CZTSSe thin films. High intense peak at 27.9 degrees in the XRD pattern corresponding to (112) plane was observed. High intensity of XRD peak corresponding to (112) direction revealed that the growth is oriented along (112) direction. Raman analysis also showed the presence of two peaks related to Se and S anions in CZTSSe thin films. In the Raman spectra of CZTSSe thin films; peaks corresponding to Se anions were observed at 190-206 cm(-1) and peaks corresponding to S anions were observed at 329-338 cm(-1). Elemental analysis results showed that S/Se ratio did not change much with increase in annealing time. To the best of our knowledge, this is the first report on the deposition of CZTSSe by sequential reactive sputtering of metal targets and controlled selenization. (C) 2015 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Thin films Cu2ZnSn(S,Se)4 Raman spectroscopy Optical properties X-ray diffraction
Subjects: Chemistry > Physical Chemistry
Materials Science
Metallurgy & Metallurgical Engineering
Depositing User: Dr. Rajpal Walke
Date Deposited: 20 Sep 2016 07:11
Last Modified: 20 Sep 2016 07:11

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