The alterations of carrier separation in kesterite solar cells
- 주제(키워드) CZTSSe , Carrier separation , Surface potential , Local current , Defect , Flexible thin-film solar cell
- 주제(기타) Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
- 설명문(일반) [Yang, Kee-Jeong; Kim, Sammi; Sim, Jun-Hyoung; Son, Dae-Ho; Kim, Dae-Hwan; Kang, Jin-Kyu] DGIST, Convergence Res Ctr Solar Energy, Daegu 42988, South Korea; [Kim, Juran; Jo, William] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [Yoo, Hyesun; Kim, JunHo] Incheon Natl Univ, Dept Phys, Incheon 22012, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 ELSEVIER SCIENCE BV
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000156052
- 본문언어 영어
- Published As http://dx.doi.org/10.1016/j.nanoen.2018.07.039
초록/요약
Cu2ZnSn(S,Se) S-4 (CZTSSe) thin films have attracted attention as low-cost absorber materials for solar cells; however, further studies are required to develop flexible solar cells from this material and to achieve a high power conversion efficiency. Toward this objective, this work investigated eight types of precursors applied on flexible Mo foil substrates, some of which also contained a layer of NaF. Secondary phases, defects, and defect clusters were different in the various samples, and the surface electrical characteristics of the CZTSSe absorber layer varied accordingly. In contrast to those in the CIGS-based cells, defects and defect clusters generated in the CZTSSe absorber layer caused an upward band bending-like band structure to form at the grain boundaries (GBs), thereby forming an intra-grain (IG) current path. By improving carrier separation, a flexible CZTSSe thin-film solar cell was developed on a Mo foil substrate with a power conversion efficiency of 7.04%. Thus, the efficiency of CZTSSe thin-film solar cells could be increased through carrier separation measures that enabled the collection of holes toward the GBs and of electrons toward IGs.
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