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Issue 3, 2019
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Large-grained formamidinium-based films via a 2D–3D conversion mechanism for high-performance perovskite solar cells without anti-solvent

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Abstract

High quality and uniform dense perovskite films are essential to exciton dissociation and charge transportation in perovskite solar cells (PSCs). Although MA1−xFAxPbI3 planar films can be fabricated by a solution process with chlorobenzene anti-solvent, the fabrication still suffers from problems such as environmental pollution, high cost and low reproducibility. In this work, we present a HI and MACl assisted 2D–3D conversion mechanism (HI-MACl ACM), defined as an anti-solvent-free method, to fabricate pure phase MA1−xFAxPbI3 and enhance the quality of perovskite films. The intermediate 2D HMA1−xFAxPbI3Cl derived from HI-MACl ACM eventually transforms to 3D MA1−xFAxPbI3 perovskite. This 2D structure also has an impact on retarding nucleation. The obtained films were composed of highly crystallized and large grains (over 1000 nm), which minimized grain boundaries and trap sites, giving a power conversion efficiency above 18.86% in PSCs.

Graphical abstract: Large-grained formamidinium-based films via a 2D–3D conversion mechanism for high-performance perovskite solar cells without anti-solvent

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Publication details

The article was received on 23 Jun 2018, accepted on 11 Dec 2018 and first published on 13 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA06044D
Citation: J. Mater. Chem. A, 2019,7, 1341-1348

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    Large-grained formamidinium-based films via a 2D–3D conversion mechanism for high-performance perovskite solar cells without anti-solvent

    X. Xu, Z. Li, L. Zhu, H. Zheng, G. Liu, T. Hayat, A. Alsaedi, X. Zhang, Y. Huang and X. Pan, J. Mater. Chem. A, 2019, 7, 1341
    DOI: 10.1039/C8TA06044D

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