Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 50, Issue -, Pages 9-15Publisher
ELSEVIER
DOI: 10.1016/j.jechem.2020.03.007
Keywords
Cu2ZnSn(S,Se)(4); Thin film solar cell; Ag substitution; Alkali doping; Post-treatment
Funding
- National Natural Science Foundation of China [61874159, 61974173, 51702085, 51802081, 21603058]
- Joint Talent Cultivation Funds of NSFC-HN [U1704151]
- Science and Technology Innovation Talents in Universities of Henan Province [18HASTIT016]
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Although silver (Ag) substitution offers several benefits in eliminating bulk defects and facilitating interface type inversion for Cu2ZnSn(S,Se)(4) (CZTSSe) photovoltaic (PV) technology, its further development is still hindered by the fairly low electrical conductivity due to the significant decrease of acceptors amount. In this work, a versatile Li-Ag co-doping strategy is demonstrated to mitigate the poor electrical conductivity arising from Ag through direct incorporating Li via postdeposition treatment (PDT) on top of the Ag-substituted CZTSSe absorber. Depth characterizations demonstrate that Li incorporation increases p-type carrier concentration, improves the carrier collection within the bulk, reduces the defects energy level as well as inverts the electric field polarity at grain boundaries (GBs) for Ag-substituted CZTSSe system. Benefiting from this lithium-assisted complex engineering of electrical performance both in grain interior (GI) and GBs, the power conversion efficiency (PCE) is finally increased from 9.21% to 10.29%. This systematic study represents an effective way to overcome the challenges encountered in Ag substitution, and these findings support a new aspect that the synergistic effects of double cation dopant will further pave the way for the development of high efficiency kesterite PV technology. (c) 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
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