Dual Additive for Simultaneous Improvement of Photovoltaic Performance and Stability of Perovskite Solar Cell

Additive engineering is one of the most efficient approaches to improve not only photovoltaic performance but also phase stability of formamidinium (FA)‐based perovskite. Chlorine‐based additives, such as methylammonium chloride (MACl), have been in general used to improve phase stability of FAPbI3,...

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Bibliographic Details
Published in:Advanced functional materials 2021-05, Vol.31 (20), p.n/a
Main Authors: Yang, In Seok, Park, Nam‐Gyu
Format: Article
Language:English
Subjects:
Additives
charge recombination
Chlorine
Circuits
defect passivation
dual additive
Energy conversion efficiency
Materials science
Mixing ratio
perovskite solar cells
Perovskites
Phase stability
Photovoltaic cells
Relative humidity
Room temperature
Solar cells
Stability tests
trap density
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Summary:Additive engineering is one of the most efficient approaches to improve not only photovoltaic performance but also phase stability of formamidinium (FA)‐based perovskite. Chlorine‐based additives, such as methylammonium chloride (MACl), have been in general used to improve phase stability of FAPbI3, which however often leads to loss of open‐circuit voltage Voc, accompanied by instability of the perovskite phase due to the volatile nature of the MA cation. A dual additive strategy for improving Voc and thereby the overall efficiency are reported here. The mixing ratio of MACl to CsCl is varied from [MACl]/[CsCl] = 4 to 1, where Voc increases with decreasing the ratio and best performance is achieved from [MACl]/[CsCl] = 2. As compared to the single source of MACl, the addition of CsCl reduces trap density and increases resistance against charge recombination, which is responsible for the increased Voc. Moreover, defect passivation achieved by dual additive enables better stability than the single additive MACl as confirmed by long‐term stability tests with unencapsulated devices for 50 days under relative humidity of about 40% at room temperature. The best power conversion efficiency of 23.22% is achieved by dual additive, which is higher than that for single additive of MACl or CsCl. Addition of dual additive of methylammonium chloride (MACl) and CsCl in the FAPbI3 perovskite precursor solution with a molar ratio of [MACl]/[CsCl] = 2 results in a higher power conversion efficiency and better stability than the single additive, due mainly to the further reduction in trap density and increase in resistance for charge recombination.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202100396