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The role of vapor-assisted solution process on tailoring chemical composition and morphology of mixed-halide perovskite solar cells

Abstract

Herein, we report a modified two-step method to construct a uniform and pinhole-free polycrystalline perovskite film with large grains up to microscale using lead mixed-halide (PbI2-PbCl2) precursor solutions to guarantee the device functioning. Commonly used sequential deposition methods based on dip- and spin-coatings are combined with a vapor-assisted solution process to improve perovskite morphology and tune the residual lead mixed-halides. These can enhance the optical absorption and efficiency of perovskite solar cell (PSC) devices. The impact of Cl content in lead mixed-halide precursors and the employed preparation methods on photovoltaic performance of PSCs are studied. The highest performance of PSC is obtained for vapor-treated film containing 2 mol.% PbCl2 deposited by spin-coating, showing a 56% increase in photoconversion efficiency compared to the pristine PbI2-based device.

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Publication details

The article was received on 18 Apr 2018, accepted on 02 Jul 2018 and first published on 05 Jul 2018


Article type: Paper
DOI: 10.1039/C8CE00628H
Citation: CrystEngComm, 2018, Accepted Manuscript
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    The role of vapor-assisted solution process on tailoring chemical composition and morphology of mixed-halide perovskite solar cells

    S. Tafazoli, N. Timasi, E. Nouri and M. Mohammadi, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00628H

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