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Methylamine-Dimer-Induced Phase Transition toward MAPbI3 Films and High-Efficiency Perovskite Solar Modules
journal contribution
posted on 2020-03-19, 16:34 authored by Xiaofeng Huang, Ruihao Chen, Guocheng Deng, Faming Han, Pengpeng Ruan, Fangwen Cheng, Jun Yin, Binghui Wu, Nanfeng ZhengPerovskite
films prepared with CH3NH2 molecules
under ambient conditions have led to rapid fabrication of perovskite
solar cells (PSCs), but there remains a lack of mechanistic studies
and inconsistencies with operability in their production. Here the
crystal structure of CH3NH2–CH3NH3PbI3 was analyzed to involve hydrogen bonds
(CH3NH2···CH3NH3+) and has guided the facile, reproducible preparation
of high-quality perovskite films under ambient conditions. Hydrogen
bonds within CH3NH2···CH3NH3+ dimers were found in the CH3NH2–CH3NH3PbI3 intermediates, accompanied by 1D-PbI3– chains (δ-phase). The weakly hydrogen-bonded CH3NH2 molecules were easily released from the CH3NH2–CH3NH3PbI3 intermediates, contributing to rapid, spontaneous phase transition
from 1D-PbI3– (δ-phase) to 3D-PbI3– (α-phase). Further introduction
of CH3NH3Cl into the CH3NH2–CH3NH3PbI3 intermediates
led to interruption of 1D-PbI3– transition
into 0D-Pb2I9‑xClx5–(0 < x < 6), adjusting the phase transition route toward 3D-PbI3–. On the basis of the above understanding,
CH3NH2 solution in ethanol and CH3NH3Cl were used for precursors and a best efficiency of
20.3% in PSCs was achieved. Large-scale modules (12 cm2 aperture area) fabricated by a dip-coating technology exhibited
an efficiency up to 16.0% and outstanding stability over 10 000
s under continuous output. The developed preparation method of perovskite
precursors and insightful research into the methylamine-dimer-induced
phase transition mechanism have enabled the production of high-quality
perovskite films with robust operability, showing great potential
for large-scale commercialization.
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phase transition routeambient conditionsMethylamine-Dimer-Induced Phase Transition0 D-Pb 2High-Efficiency Perovskite Solar Modules Perovskite filmsCH 3 NH 3 Clperovskite filmsCH 3 NH 2 solutionPSCCH 3 NH 2 moleculesMAPbI 3 Filmsmethylamine-dimer-induced phase transition mechanismhydrogen-bonded CH 3 NH 2 molecules
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