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

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Abstract

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.

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

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Article information


Submitted
17 Nov 2019
Accepted
17 Jan 2020
First published
18 Jan 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

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

C. Li, A. Wang, L. Xie, X. Deng, K. Liao, J. Yang, Y. Xiang and F. Hao, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC06293A

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