Highly Efficient and Stable FASnI3 Perovskite Solar Cell via Modification with Tetrapotassium Hexacyanoferrate

Sn‐based perovskite material is one of the promising absorption materials due to its low toxicity and narrow bandgap. However, the unsatisfying quality of the perovskite film caused by Sn2+ oxidation and poor crystal growth greatly hinders the device performance. Herein, a layer of tetrapotassium he...

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Bibliographic Details
Published in:Solar RRL 2022-12, Vol.6 (12), p.n/a
Main Authors: Ai, Yuquan, Kong, Tengfei, Lim, Eng Liang, Song, Jing, Zhang, Yang, Bi, Dongqin
Format: Article
Language:English
Subjects:
energy alignment
FASnI3
oxidation
tetrapotassium hexacyanoferrate
Online Access:Get full text
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Summary:Sn‐based perovskite material is one of the promising absorption materials due to its low toxicity and narrow bandgap. However, the unsatisfying quality of the perovskite film caused by Sn2+ oxidation and poor crystal growth greatly hinders the device performance. Herein, a layer of tetrapotassium hexacyanoferrate at the PEDOT:PSS/FASnI3 interface is introduced, which can minimize the concentration of Sn4+, thereby suppressing the defect states in the perovskite film, enhancing the conductivity of the PEDOT:PSS film, and forming well‐matched energy alignment in the device. Consequently, the champion device performance of 8.9% is obtained by the modified device, and the unencapsulated device can keep outstanding stability in N2 atmosphere. Tetra‐potassium hexacyanoferrate incorporation at the poly(3,4‐ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)/FASnI3 interface increases PEDOT:PSS film conductivity, inhibits Sn2+ oxidation, and optimizes energy‐level alignment. The champion device achieves an improved power conversion efficiency of 8.9% with superior long‐term stability in a nitrogen atmosphere.
ISSN:2367-198X
2367-198X
DOI:10.1002/solr.202200799