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Structurally Reinforced All‐Inorganic CsPbI 2 Br Perovskite by Nonionic Polymer via Coordination and Hydrogen Bonds
Author(s) -
Peng Huirong,
Cai Molang,
Zhou Jiyu,
Yang Yi,
Ding Xihong,
Tao Ye,
Wu Gao,
Liu Xuepeng,
Pan Jia Hong,
Dai Songyuan
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202000216
Subject(s) - perovskite (structure) , hydrogen bond , alkyl , relative humidity , materials science , chemical engineering , polymer , moisture , thermal stability , phase (matter) , polymer chemistry , humidity , ion , energy conversion efficiency , durability , hydrogen , chemistry , composite material , organic chemistry , molecule , optoelectronics , thermodynamics , physics , engineering
The all‐inorganic CsPbI 2 Br perovskite with superior thermal durability faces challenges of low‐phase stability and high moisture sensitivity. Herein, a nonionic additive of polyethyleneimine (PEI) with multiple amino groups is introduced to form hydrogen bond with I − /Br − ions and coordinate with Pb 2+ /Cs + ions simultaneously. The strong interplay between PEI and CsPbI 2 Br achieves a well‐controlled grain size, reduced defects, and reinforced phase structure of CsPbI 2 Br film, which boosts the power conversion efficiency (PCE) of perovskite solar cells to 15.48%. The hydrophobic long alkyl chain of PEI greatly improves the humidity resistance, retaining 81.9% of initial PCE of zjr unsealed device under 20 ± 5% relative humidity (RH) for 500 h. Remarkably, a PCE of 13.37% is achieved by the device based on CsPbI 2 Br–PEI film processed under ambient condition (≈22% RH, ≈25 °C).
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