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Title: | Synthesis and characterization of (Cd,Zn)S buffer layer for Cu2ZnSnSe4 solar cells | Authors: | Ben Messaoud, Khaled Buffière, Marie BRAMMERTZ, Guy Lenaers, Nick BOYEN, Hans-Gerd Sahayaraj, Sylvester MEURIS, Marc Amlouk, Mosbah POORTMANS, Jef |
Issue Date: | 2017 | Source: | Journal of Physics D: Applied Physics, 50 (28) | Abstract: | In order to improve the electrical performances of Cu2ZnSnSe4 (CZTSe) based solar cells, the standard CdS buffer layer was replaced by (Cd,Zn)S processed by chemical bath deposition. The morphology and composition of the (Cd,Zn)S thin films were studied as a function of [Zn]/([Zn] + [Cd]) ratio in the chemical bath (80, 85 and 90%). The CZTSe/(Cd,Zn)S solar cells with and without Cd partial electrolyte (Cd PE) treatment were compared to CZTSe/CdS reference devices using current–voltage and external quantum efficiency measurements. The (Cd,Zn)S thin films show a non-homogeneity of Zn distribution and phase formation, with a shift from Zn(O,OH)x to ZnS phase when increasing the deposition time and a decrease of the layers thicknesses when increasing the Zn concentration in chemical bath. A model for the growth of (Cd,Zn)S thin films is proposed. The resulting CZTSe/(Cd,Zn)S devices show an important reduction of the barrier at the hetero-interface, which is attributed to the lower density of O contamination in (Cd,Zn)S compared to CdS, inducing a lower density of deep p-type recombination centers. Despite the reduced compensation of the buffer layer, CZTSe/(Cd,Zn)S devices show a deterioration of the open circuit voltage and the fill factor with the increase of Zn content in (Cd,Zn)S. These electrical losses were avoided by Cd PE treatment prior to the deposition of (Cd,Zn)S. | Notes: | Ben Messaoud, K (reprint author), King Abdulaziz City Sci & Technol, King Abullah Rd 6086, Riyadh 11442, Saudi Arabia. khaledbm@live.com | Keywords: | thin film; solar cells; Cu2ZnSnSe4; (Cd,Zn)S buffer layers; carrier recombination | Document URI: | http://hdl.handle.net/1942/24411 | ISSN: | 0022-3727 | e-ISSN: | 1361-6463 | DOI: | 10.1088/1361-6463/aa76b7 | ISI #: | 000413562600001 | Rights: | © 2017 IOP Publishing Ltd | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2018 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
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Cd-Zn-S_JPD.pdf | Peer-reviewed author version | 1.35 MB | Adobe PDF | View/Open |
Messaoud_2017_J._Phys._D%3A_Appl._Phys._50_285501.pdf Restricted Access | Published version | 2.46 MB | Adobe PDF | View/Open Request a copy |
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