期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 22, 页码 10379-10387出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta02584c
关键词
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资金
- Natural Science Foundation of Hubei Province of China [2018CFA055]
- Fundamental Research Funds for the Central Universities of China [WUT: 2015III018, 2015III029]
- Recruitment Program of Global Experts (1000 Talents Plan) of China
An n-type helical molecule perylene diimide (PDI2) has been explored as an efficient interfacial layer between TiO2 and perovskite for the preparation of perovskite solar cells. The extended pi-conjugation of PDI2 ensures a high electron conductivity for efficient charge transport, and the oxygen atoms of the carbonyl groups can chelate with uncoordinated Pb2+ to passivate the surface defects of perovskite crystals. It thereby suppresses interfacial recombination, enhances efficiency, and reduces hysteresis and the light-soaking instability. The power conversion efficiency (PCE) of our perovskite solar cells showed negligible dependence on the thickness of the PDI2 interlayer, and the champion device achieved a high PCE of 19.84% and the hysteresis value (Delta PCE) was reduced to 2.34% compared to 6.46% in the perovskite device without the presence of the PDI2 interlayer.
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