The effect of the Zn/Sn ratio on the formation of single phase kesterite Cu2ZnSnS4 solar cell material |
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| Affiliation: | 1. Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China;2. Department of Materials Science and Engineering, National University of Singapore, Singapore 117543, Singapore;3. Faculty of Maths and Physics, China University of Geosciences, Geosciences (Wuhan), Wuhan 430074, China;1. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, PR China;2. Department of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China;1. Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109 Berlin, Germany;2. Freie Universität Berlin, Malteserstr. 74-100, 12249 Berlin, Germany;1. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. Key Lab for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, China;3. Materials Science and Engineering, University of Utah, Salt Lake City, 84112 UT, USA;4. Electrical and Computer Engineering, University of Utah, Salt Lake City, 84112 UT, USA;1. Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besòs, Spain;2. IN2UB, Universitat de Barcelona, C. Martí Franquès 1, 08028 Barcelona, Spain |
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| Abstract: | The effect of the Zn/Sn ratio in the solution on the properties of Cu2ZnSnS4 films prepared by sol-gel method has been investigated. As the Zn/Sn ratio in the solution increases to a certain value, a pure single phase kesterite CZTS is obtained and confirmed by XRD, XPS and Raman. Through controlling the Zn/Sn ratio in the solution, secondary phases such as SnO2 can be avoided and an optimal condition for single phase kesterite CZTS can be achieved. Surface SEM images of the CZTS films are investigated and the optical band gap of the optimized CZTS film is found to be 1.23 eV. |
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| Keywords: | Structural properties Optical properties |
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