Structure and Optical Properties CdS and CdTe Films on Flexible Substrate Obtained by DC Magnetron Sputtering for Solar Cells

Authors G.I. Kopach , R.P. Mygushchenko , G.S. Khrypunov , A.I. Dobrozhan , M.M. Harchenko

National Technical University «Kharkіv Polytechnic Institute», 2, Kyrpychov Str., 61002 Kharkiv, Ukraine

Issue Volume 9, Year 2017, Number 5
Dates Received 31 August 2017; published online 16 October 2017
Citation G.I. Kopach, R.P. Mygushchenko, G.S. Khrypunov, et al., J. Nano- Electron. Phys. 9 No 5, 05035 (2017)
DOI 10.21272/jnep.9(5).05035
PACS Number(s) 81.05.Dz, 81.15.Cd
Keywords Cadmium sulphide, Cadmium telluride (2) , Direct current magnetron sputtering, Solar cell (51) , Thin films (60) .
Annotation The paper describes investigate of crystal structure and optical characteristics of the CdS transparent window layers and the CdTe base layers, obtained by direct current magnetron sputtering on glass or polyimide substrate, and output parameters the flexible thin film solar cells based on them. The band gap in obtained hexagonal CdS films is Eg  2.38-2.41 eV and optical transparency of CdS films is 80-90%. Conducting chloride treatment of CdTe layers, obtained at T  3000C, promotes wurtzite-sphalerite phase transition. Cooling ITO/CdS layers to room temperature before CdTe deposition, removal of the air and subsequent heating in vacuum to the required temperature of the substrate leads to an increase of the energy conversion efficiency and open circuit voltage of the polyimide/ITO/CdS/CdTe/Cu/Ag flexible solar cell.

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