Secondary lateral growth of MAPbI3 grains for the fabrication of efficient perovskite solar cells

Chengbo LI, Aili WANG, Lisha XIE, Xiaoyu DENG, Kejun LIAO, Jin-an YANG, Yong XIANG, Feng HAO

Research output: Journal PublicationsJournal Article (refereed)peer-review

25 Citations (Scopus)


The morphology and optoelectronic properties of perovskite films are the key to high-performance perovskite solar cells (PSCs). Here, a facile non-destructive interface ethanol/chlorobenzene (EtOH/CB) post treatment was established for the lateral grain growth of MAPbI3 perovskite films and fabrication of efficient solar cells. The alcoholic treatment leads to perovskite grain coarsening and a secondary growth in the average grain size from 38.88 μm to 89.59 μm. The enlargement of the perovskite crystals induced a notable defect passivation and attenuated charge recombination centers as confirmed by photoluminescence, electrochemical impedance spectroscopy, and photocharge extraction by a linearly-increasing voltage. Accordingly, inverted planar PSC devices showed an 18% enhancement in the overall power conversion efficiency using this alcoholic post-treatment under ambient fabrication conditions. Our results demonstrate a versatile strategy for the lateral growth of perovskite photovoltaics and beyond.

Original languageEnglish
Pages (from-to)3217-3225
Number of pages9
JournalJournal of Materials Chemistry C
Issue number9
Early online date18 Jan 2020
Publication statusPublished - 7 Mar 2020
Externally publishedYes

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This journal is © 2020 The Royal Society of Chemistry.


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