Improving Efficiency of Evaporated Cu2ZnSnS4 Thin Film Solar Cells by a Thin Ag Intermediate Layer between Absorber and Back Contact. (22nd January 2015)

• Record Type: Journal Article
• Authors: Cui, Hongtao; Lee, Chang-Yeh; Li, Wei; Liu, Xiaolei; Wen, Xiaoming; Hao, Xiaojing
• Other Names: Bhattacharya Raghu N. Academic Editor.
• Is Part Of: International journal of photoenergy. Volume 2015(2015)
• Publication Date: 2015-01-22
• Subjects: Photochemistry -- Periodicals; Photobiology -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Photochimie; Photobiologie; Chimie physique et théorique; Chemistry, Physical and theoretical; Photobiology; Photochemistry; Electronic journals; Periodicals; 541.35
• DOI: 10.1155/2015/170507
• Languages: English
• ISSNs: 1110-662X

Abstract

Abstract : A 20 nm Ag coating on Mo back contact was adopted to improve the back contact of evaporated Cu2 ZnSnS4 (CZTS) solar cells. The Ag layer helped reduce the thickness of MoS2 which improves fill factor (FF) significantly; additionally, it reduced secondary phases ZnS and SnS2− x, which may help carrier transport; it was also involved in the doping of the absorber layer, which compensated the intrinsic p-type doping and therefore drags down the doping level. The doping involvement may enlarge the depletion region and improve lifetime of the absorber, which led to enhancing open circuit voltage (V O C ), short circuit current density (J S C ), and efficiency significantly. However, it degrades the crystallinity of the material slightly.