10% Efficiency Cu2ZnSn(S,Se)4 thin film solar cells fabricated by magnetron sputtering with enlarged depletion region width

Li, Jianjun, Wang, Hongxia, Luo, Miao, Tang, Jiang, Chen, Cheng, Liu, Wei, Liu, Fangfang, Sun, Yun, Han, Junbo, & Zhang, Yi (2016) 10% Efficiency Cu2ZnSn(S,Se)4 thin film solar cells fabricated by magnetron sputtering with enlarged depletion region width. Solar Energy Materials and Solar Cells, 149, pp. 242-249.

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High performance Cu2ZnSn(S,Se)4 (CZTSSe) solar cells are fabricated by selenization of the precursor films of Mo/Sn/Cu/ZnS/Sn/ZnS/Cu deposited by magnetron sputtering. The investigation of the solar cells with different Zn/Sn ratio in CZTSSe film discloses that the charge carrier concentration and depletion region width of the device is very sensitive to Zn/Sn ratio of CZTSSe layer. The CZTSSe film with Zn/Sn=1.05 has lower carrier density (5.0×1015 cm−3), which is half of the cell with Zn/Sn=1.12, whereas the depletion region at the CdS/CZTSSe hetero-junction interface of the former (200–250 nm) is 100 nm longer than the latter. As a result, better collection of photo-generated charge carrier is found with the cell with longer Wd in the longer wavelength region above 800 nm. Therefore, the average power conversion efficiency is increased from 6.53% to 9.16% with enlarged depletion region width, and the best performance with 10.2% efficiency is achieved.

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2 citations in Web of Science®

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ID Code: 95749
Item Type: Journal Article
Refereed: Yes
Keywords: CZTSSe, Thin film solarcells, Sputtering, Charge carrierconcentration, Depletion region width
DOI: 10.1016/j.solmat.2016.02.002
ISSN: 0927-0248
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2016 Elsevier B.V.
Deposited On: 25 May 2016 00:02
Last Modified: 26 May 2016 01:52

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