Recovery mechanisms in aged kesterite solar cells

Campbell, Stephen, Duchamp, Martial, Ford, Bethan, Jones, Michael, Nguyen, Linh Lan, Naylor, Matthew, Xu, Xinya, Maiello, Pietro, Zoppi, Guillaume, Barrioz, Vincent, Beattie, Neil and Qu, Yongtao (2022) Recovery mechanisms in aged kesterite solar cells. ACS Applied Energy Materials, 5 (5). pp. 5404-5414. ISSN 2574-0962

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For successful long-term deployment and operation of kesterites Cu2ZnSn(SxSe1−x)4 (CZTSSe) as light absorber materials for photovoltaics, device stability and recovery in kesterite solar cells are investigated. A low temperature heat treatment is applied to overcome the poor charge extraction that developed in the natural aging process. It is suggested that defect states at aged CZTSSe/CdS heterojunctions were reduced while apparent doping density in the CZTSSe absorber increased due to Cd/Zn inter-diffusion at the heterojunction during the annealing process. In situ annealing experiments in a transmission electron microscope were used to investigate the elemental diffusion at the CZTSSe/CdS heterojunction. This study reveals the critical role of heat treatment to enhance the absorber/Mo back contact, improve the quality of the absorber/buffer heterojunction and recover the device performance in aged kesterite thin film solar cells.

Item Type: Article
Additional Information: Funding information: This work was supported by the Engineering, and Physical Sciences Research Council (EP18 SRC) (EP/T005491/1 and EP/S023836/1). The authors also appreciate the support from North East Centre for Energy Materials (NECEM) (EP/R021503/1) and British Council Newton Fund Institutional Links Grant (CRP01286). This research was funded by Ministry of Education, Singapore Tier 2 MOE2019-T2-2-066. M.D. and L.L.M. acknowledge the Facilities for Analysis, Characterization, Testing and Simulations (FACTS) at the Nanyang Technological University for access to the FIB and TEM equipment.
Uncontrolled Keywords: Kesterite, Photovoltaics, Heat-treatment, In situ transmission electron microscopy (TEM), Elemental diffusion, SCAPS
Subjects: F200 Materials Science
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 15 Feb 2022 08:43
Last Modified: 29 Jun 2022 11:15

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