期刊
SMALL
卷 17, 期 50, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202103336
关键词
hydrophobicity; Lewis acid-base; perovskite solar cells; stability; synergistic effect
类别
资金
- National Natural Science Foundation of China [U1705256, 51972123, 21771066]
- Cultivation Program for Postgraduate in Scientific Research Innovation Ability of Huaqiao University [18011081007]
The paper introduces a strategy for synergistic optimization of perovskite films by defects passivation and surface modification, which successfully enhances the power conversion efficiency and stability of the devices.
The carrier non-radiative recombination and instability of device caused by the inherent defects are main factors limiting development of perovskite solar cells (PSCs). During the fabrication process of a PSC device, perovskite films often produce Pb-0 and I-0 defects. This paper reports a strategy for synergistic optimization of perovskite films by defects passivation and surface modification. The doping of phthalide (PT) in the Pb-rich (CH(NH2)(2))(1-x)(CH3NH3)(x)PbI3 film can passivate lead cation defects, and the modification of 1-iodooctadecane (1-IO) can reduce halogen anion defects and improve stability of PSCs owing to its hydrophobicity. The PT and 1-IO optimized device achieves a power conversion efficiency (PCE) of 22.27%. The optimized PSCs remain 93.2% of the initial PCE when placed in air environment (relative humidity of 10%, 25 degrees C) more than 70 days. The PT and 1-IO synergistic optimization provides a novel strategy for improving the performance and stability of PSCs.
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