In:
Angewandte Chemie, Wiley, Vol. 135, No. 24 ( 2023-06-12)
Abstract:
Possessed with advantageous optoelectronic properties, perovskites have boosted the rapid development of solution‐processed solar cells. The performance of perovskite solar cells (PSCs) is significantly weakened by the carrier loss at grain boundary grooves (GBGs); however, it receives limited attention and there lacks effective approach to solve this issue. Herein, for the first time, we constructed the tungstate/perovskite heterointerface via a “two step” in situ reaction approach that provides effective defect passivation and ensures efficient carrier dynamics at the GBGs. The exposed perovskite at grain boundaries is converted to wide‐band‐gap PbWO 4 via an in‐situ reaction between Pb 2+ and tungstate ions, which passivate defects due to the strong ionic bonding. Moreover, recombination loss is further suppressed via the heterointerface energetics modification based on an additional transformation from PbWO 4 to CaWO 4 . PSCs based on this groove modification strategy showed good universality in both normal and inverted structure, with an improved efficiency of 23.25 % in the n‐i‐p device and 23.33 % in the p‐i‐n device. Stable power output of the modified device could maintain 91.7 % after around 1100 h, and the device efficiency could retain 92.5 % after aging in air for around 2110 h, and 93.1 % after aging at 85 °C in N 2 for 972 h.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v135.24
DOI:
10.1002/ange.202303176
Language:
English
Publisher:
Wiley
Publication Date:
2023
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