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Open AccessCommunication

Solution-Processed CdTe Thin-Film Solar Cells Using ZnSe Nanocrystal as a Buffer Layer

by Yanru Chen 1,†, Xianglin Mei 1,†, Xiaolin Liu 1,†, Bin Wu 1,†, Junfeng Yang 1,†, Junyu Yang 2, Wei Xu 1,3,*, Lintao Hou 2,*, Donghuan Qin 1,3,* and Dan Wang 1,3
1
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
2
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China
3
Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou 510640, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Appl. Sci. 2018, 8(7), 1195; https://doi.org/10.3390/app8071195
Received: 9 July 2018 / Revised: 16 July 2018 / Accepted: 16 July 2018 / Published: 21 July 2018
(This article belongs to the Special Issue Next Generation Photovoltaic Solar Cells)
The CdTe nanocrystal (NC) is an outstanding, low-cost photovoltaic material for highly efficient solution-processed thin-film solar cells. Currently, most CdTe NC thin-film solar cells are based on CdSe, ZnO, or CdS buffer layers. In this study, a wide bandgap and Cd-free ZnSe NC is introduced for the first time as the buffer layer for all solution-processed CdTe/ZnSe NC hetero-junction thin-film solar cells with a configuration of ITO/ZnO/ZnSe/CdTe/MoOx/Au. The dependence of the thickness of the ZnSe NC film, the annealing temperature and the chemical treatment on the performance of NC solar cells are investigated and discussed in detail. We further develop a ligand-exchanging strategy that involves 1,2-ethanedithiol (EDT) during the fabrication of ZnSe NC film. An improved power conversion efficiency (PCE) of 3.58% is obtained, which is increased by 16.6% when compared to a device without the EDT treatment. We believe that using ZnSe NC as the buffer layer holds the potential for developing high-efficiency, low cost, and stable CdTe NC-based solar cells. View Full-Text
Keywords: solution processed; CdTe; ZnSe; nanocrystal; solar cells solution processed; CdTe; ZnSe; nanocrystal; solar cells
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Chen, Y.; Mei, X.; Liu, X.; Wu, B.; Yang, J.; Yang, J.; Xu, W.; Hou, L.; Qin, D.; Wang, D. Solution-Processed CdTe Thin-Film Solar Cells Using ZnSe Nanocrystal as a Buffer Layer. Appl. Sci. 2018, 8, 1195.

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