Stabilizing Perovskite Precursor by Synergy of Functional Groups for NiOx‐Based Inverted Solar Cells with 23.5 % Efficiency

Perovskite solar cells suffer from poor reproducibility due to the degradation of perovskite precursor solution. Herein, we report an effective precursor stabilization strategy via incorporating 3‐hydrazinobenzoic acid (3‐HBA) containing carboxyl (−COOH) and hydrazine (−NHNH2) functional groups as s...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2022-08, Vol.61 (35), p.e202206914-n/a
Main Authors: Li, Mengjia, Li, Haiyun, Zhuang, Qixin, He, Dongmei, Liu, Baibai, Chen, Cong, Zhang, Boxue, Pauporté, Thierry, Zang, Zhigang, Chen, Jiangzhao
Format: Article
Language:English
Subjects:
Cations
Chemical Sciences
Defect Passivation
Degradation
Functional Groups
Hydrazine
Hydrazines
Material chemistry
Maximum power tracking
Oxidation
Perovskite Precursor Solution
Perovskite Solar Cells
Perovskites
Photovoltaic cells
Precursors
Solar cells
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Summary:Perovskite solar cells suffer from poor reproducibility due to the degradation of perovskite precursor solution. Herein, we report an effective precursor stabilization strategy via incorporating 3‐hydrazinobenzoic acid (3‐HBA) containing carboxyl (−COOH) and hydrazine (−NHNH2) functional groups as stabilizer. The oxidation of I−, deprotonation of organic cations and amine‐cation reaction are the main causes of the degradation of mixed organic cation perovskite precursor solution. The −NHNH2 can reduce I2 defects back to I− and thus suppress the oxidation of I−, while the H+ generated by −COOH can inhibit the deprotonation of organic cations and subsequent amine‐cation reaction. The above degradation reactions are simultaneously inhibited by the synergy of functional groups. The inverted device achieves an efficiency of 23.5 % (certified efficiency of 23.3 %) with an excellent operational stability, retaining 94 % of the initial efficiency after maximum power point tracking for 601 hours. A precursor stabilization and defect passivation strategy was developed by employing 3‐hydrazinobenzoic acid (3‐HBA) as a versatile additive. The synergistic effect of −NHNH2 and −COOH suppresses oxidation of I−, deprotonation of organic cations and amine‐cation reaction. The NiOx‐based inverted device achieves a certified efficiency of 23.3 % with excellent operational stability.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202206914