The effect of substrate temperature and Sn/Se mass ratio on the co-evaporated SnSe thin film for photovoltaic application. (July 2020)

• Record Type: Journal Article
• Authors: Li, Zeng; Guo, Yixin; Zhao, Fei; Nie, Chengqi; Shi, Jingyu; Liu, Xiaohui; Zuo, Shaohua; Jiang, Jinchun
• Is Part Of: Vacuum. Volume 177(2020)
• Publication Date: 2020-07
• Subjects: Sn/Se mass ratio -- Substrate temperature -- Co-evaporation -- SnSe thin films -- Conversation efficiency; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2020.109343
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: In this work, SnSe thin films were prepared by co-evaporation method with different Sn/Se mass ratio and substrate temperature. The composition, structure, morphology and optical properties of the film were researched. The characterized results show that the film has a relatively pure SnSe phase under Sn/Se mass ratio of 1.50, and the crystallinity of SnSe thin films increases with the increase of substrate temperature. All the films showed p-type conductivity with a minimum resistivity of 1.96 × 10 −2 Ωcm and maximum electron mobility of 24.8 cm 2 V −1 s −1 . Finally, SnSe solar cells with a device structure of soda-lime glass/Mo/SnSe/CdS/i-ZnO/ITO/Ni/Al were fabricated and a best power conversation efficiency of 0.89% was achieved at the optimum substrate temperature and Sn/Se mass ratio. These results guide high quality SnSe thin films growth and contribute to the development of efficient SnSe solar cell by using evaporation based method. Highlights: A relatively pure SnSe phase film was obtained when Sn/Se ratio is 1.50 The grain size increases with the increasing substrate temperature. A minimum resistivity of 1.96 × 10 −2 Ωcm was obtained. A maximum electron mobility of 24.8 cm 2 V −1 s −1 was obtained. A best power conversation efficiency of 0.89% was achieved.