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

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Abstract

Herein, we report a modified two-step method to construct a uniform and pinhole-free polycrystalline perovskite film with large grains up to the 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 the 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 the Cl content in the lead mixed-halide precursors and the employed preparation methods on the photovoltaic performance of PSCs are studied. The highest performance of PSC is obtained for a 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.

Graphical abstract: The role of a vapor-assisted solution process on tailoring the chemical composition and morphology of mixed-halide perovskite solar cells

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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, Advance Article
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    The role of a vapor-assisted solution process on tailoring the chemical composition and morphology of mixed-halide perovskite solar cells

    S. Tafazoli, N. Timasi, E. Nouri and M. R. Mohammadi, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C8CE00628H

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