Single-phase control of CuTe thin films for CdTe solar cells. (August 2017)

• Record Type: Journal Article
• Authors: Yang, Ya; Wang, Taowen; Liu, Cai; Li, Wei; Zhang, Jingquan; Wu, Lili; Zeng, Guanggen; Wang, Wenwu; Yu, Mingzhe
• Is Part Of: Vacuum. Volume 142(2017)
• Page Start: 181
• Page End: 185
• Publication Date: 2017-08
• Subjects: Single phase -- CuxTe thin films -- Back contact -- CdTe solar cells; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2017.05.014
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: Phase control is important to obtain high-performance CdTe solar cells when copper telluride is used as a back-contact for CdTe solar cells. In this paper single-phase CuTe was mainly controlled by the Cu/Te ratio via a co-evaporation method in combination with rapid thermal processing treatments. The alloy thin films as-deposited were mainly amorphous. After thermal treatments, the films experienced the phase transformation from mixed phases of CuTe and Cu1.4 Te to single phase CuTe and then to coexisting phases. Single phase CuTe thin films were p-type semiconductor compounds and had a high carrier concentration, ∼10 21 cm −3 . With the copper telluride buffer layer, device performance than those without the buffer layer has been obtained. Moreover, single-phase orthorhombic CuTe contact buffer layer obviously improved diode characteristics and enhanced the device performance. Highlights: Single-phase CuTe thin films were prepared by vacuum co-evaporation in combination with RTP. CuTe was used as a buffer layer to form an ohmic back contact to CdTe solar cells. CuTe improved diode characteristics and enhanced cell performance.