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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Abstract
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 |
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| 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: | 08 Mar 2023 08:00 |
| URI: | https://nrl.northumbria.ac.uk/id/eprint/48461 |
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