title: Compositional and Interfacial Modification of Cu2 ZnSn(S,Se)4 Thin-Film Solar Cells Prepared by Electrochemical Deposition.
abstract: A highly efficient Cu2 ZnSn(S,Se)4 (CZTSSe)-based thin-film solar cell (9.9%) was prepared using an electrochemical deposition method followed by thermal annealing. The Cu-Zn-Sn alloy films was grown on a Mo-coated glass substrate using a one-pot electrochemical deposition process, and the metallic precursor films was annealed under a mixed atmosphere of S and Se to form CZTSSe thin films with bandgap energies ranging from 1.0 to 1.2 eV. The compositional modification of the S/(S+Se) ratio shows a trade-off effect between the photocurrent and photovoltage, resulting in an optimum bandgap of roughly 1.14 eV. In addition, the increased S content near the p-n junction reduces the dark current and interface recombination, resulting in a further enhancement of the open-circuit voltage. As a result of the compositional and interfacial modification, the best CZTSSe-based thin-film solar cell exhibits a conversion efficiency of 9.9%, which is among the highest efficiencies reported so far for electrochemically deposited CZTSSe-based thin-film solar cells.
authors.affiliation: Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, South Korea.|Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea.
authors.forename: Se Won
authors.initials: SW
authors.lastname: Seo
authors.affiliation: Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, South Korea.|Department of Nanomaterials Science and Engineering, University of Science and Technology, Daejeon, 34113, South Korea.
authors.forename: Jong-Ok
authors.initials: JO
authors.lastname: Jeon
authors.affiliation: Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, South Korea.|Green School, Korea University, Seoul, 136-701, South Korea.
authors.forename: Jung Woo
authors.initials: JW
authors.lastname: Seo
authors.affiliation: Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, South Korea.
authors.forename: Yi Yin
authors.initials: YY
authors.lastname: Yu
authors.affiliation: Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, South Korea.
authors.forename: Jeung-Hyun
authors.initials: JH
authors.lastname: Jeong
authors.affiliation: Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, South Korea.|Green School, Korea University, Seoul, 136-701, South Korea.
authors.forename: Doh-Kwon
authors.initials: DK
authors.lastname: Lee
authors.affiliation: Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, South Korea.
authors.forename: Honggon
authors.initials: H
authors.lastname: Kim
authors.affiliation: Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, South Korea.|KU-KIST Graduate School of Convering Science and Technology, Korea University, Seoul, 136-701, South Korea.
authors.forename: Min Jae
authors.initials: MJ
authors.lastname: Ko
authors.affiliation: Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, South Korea.
authors.forename: Hae Jung
authors.initials: HJ
authors.lastname: Son
authors.affiliation: Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea.
authors.forename: Ho Won
authors.initials: HW
authors.lastname: Jang
authors.affiliation: Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea. jykim.mse@snu.ac.kr.
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Kim
mesh_terms: D003300:Copper / Q000737:chemistry*; D004595:Electroplating; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D012643:Selenium / Q000737:chemistry*; D012993:Solar Energy; D014001:Tin / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D014001:Tin; D003300:Copper; D012643:Selenium; D015032:Zinc
keywords: bandgap; electrodeposition; recombination; solar cells; thin films