期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 35, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202206914
关键词
Defect Passivation; Degradation; Functional Groups; Perovskite Precursor Solution; Perovskite Solar Cells
资金
- National Natural Science Foundation of China [62004058, U21A2076, 52071048]
- Nature Science Foundation of Hebei Province [F2020202022]
- Open Fund of the State Key Laboratory of Integrated Optoelectronics [IOSKL2020KF09]
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment [EERI_PI20200005, EERI_0Y2021001]
- Central Guidance on Local Science and Technology Development Fund of Hebei Province [226Z4305G]
- Support plan for Overseas Students to Return to China for Entrepreneurship and Innovation [cx2020003]
- Fundamental Research Funds for the Central Universities [2020CDJ-LHZZ-074]
- Natural Science Foundation of Chongqing [cstc2020jcyj-msxmX0629]
In this study, a new precursor stabilization strategy for perovskite solar cells is reported, in which 3-hydrazinobenzoic acid is used as a stabilizer to effectively inhibit solution degradation. The functional groups of the stabilizer synergistically suppress the major reactions causing degradation, leading to improved efficiency and operational stability of inverted devices.
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 I-2 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.
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