標題: Preparation of Cu2ZnSnS4 (CZTS) sputtering target and its application to the fabrication of CZTS thin-film solar cells
作者: Lin, Yu-Pin
Chi, Yi-Fang
Hsieh, Tsung-Eong
Chen, Yen-Chih
Huang, Kun-Ping
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: CZTS thin-film solar cells;Single-phase CZTS sputtering target;Sputtering deposition;Sulfurization
公開日期: 5-Jan-2016
摘要: The CuS, ZnS and SnS2 raw powders were adopted as the starting materials for preparing the 2-inch Cu2ZnSnS4 (CZTS) sputtering target. The powders were mixed at various molar ratios of Cu:Zn:Sn:S = 1.6:1:1:4, 1.8:1:1:4 and 2:1:1:4, pressed into 6-mm pellet forms, and then sintered at different temperatures for 8 h. Accordingly, the influence of powder constitution and heat-treatment conditions on the microstructure, composition and morphology of CZTS pellets were investigated. Microstructure and composition analyses indicated that the sample prepared with the Cu molar ratio of 1.6 and sintered at 600 degrees C for 8 h forms the kesterite CZTS single-phase structure with the Cu-poor/Zn-rich composition. The 2-inch CZTS sputtering target was prepared by utilizing the method established by the study of 6-mm pellets and adopted for depositing the CZTS thin films. The CZTS layer deposited at the working pressure of 1 mtorr followed by the sulfurization at 570 degrees C for 1 h possessed the stoichiometry of Cu24.15Zn14.73Sn10.75S50.37 which is the closest to the ideal stoichiometric ratio of 2:1:1:4. Moreover, it exhibited the bandgap of 1.5 eV, p-type carrier concentration of 2.8 x 1017 cm(-3) and mobility of 8.61 cm(2) V-1 s(-1). Such a CZTS layer was implanted in the thin-film solar cells with the device structure of Mo/CZTS/CdS/i-ZnO/IZO/Al. Under the AM1.5 illumination condition, the CZTS thin-film solar cell sample with the open-circuit voltage of 0.52 V, the short-circuit current density of 19.17 mA/cm(2), the fill factor of 52.7% and the conversion efficiency of 5.2% was achieved. (C) 2015 Published by Elsevier B.V.
URI: http://dx.doi.org/10.1016/j.jallcom.2015.09.111
http://hdl.handle.net/11536/128359
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2015.09.111
期刊: JOURNAL OF ALLOYS AND COMPOUNDS
Volume: 654
起始頁: 498
結束頁: 508
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