Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 140, Issue 37, Pages 11577-11580Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b07025
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Funding
- National Natural Science Foundation of China [21801104, 21871121, 21471071, 21431002]
- Fundamental Research Funds for the Central Universities [lzujbky-2018-k08, lzujbky-2018-ot01]
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Defects within the grain boundaries (GBs) of halide perovskite films make fabrication of efficient and stable perovskite solar cells (PSCs) highly challenging. Here, a low-cost tetra-ammonium zinc phthalocyanine (ZnPc) was used to post-treat the MAPbI(3) (MA = CH3NH3) film. Two-dimensional (ZnPc)(0.5)MA(n-1)Pb(n)I(3n+1) was successfully constructed within the GBs of MAPbI(3) film achieving a GBs suture for passivating the defects in GBs. Time-resolved photoluminescence showed that the modification increased the decay time from 44 to 57 ns indicating the passivation of GBs reduces trap-assisted recombination. The PSCs with modified perovskite exhibited increased photovoltage, and the best efficiency was improved up to 20.3%. More importantly, the long-term stability of the responding PSCs against humidity and heating was further improved unprecedentedly. Moreover, the modified MAPbI(3) films revealed a self-repairing capability under mild heating. This work provided a novel insight into ongoing fabrication of efficient and stable PSCs by the efficient GBs suture with low-cost phthalocyanine.
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