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Issue 48, 2017
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Enhancing moisture-tolerance and photovoltaic performances of FAPbI3 by bismuth incorporation

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Abstract

The power conversion efficiency (PCE) of perovskite-based solar cells has already exceeded of 22% due to their unique optoelectronic properties. However, the long-term ambient air stability as the Achilles' heel of such promising photovoltaic materials has to be solved for commercialization. Herein, a facile method that partially substitutes B-site Pb2+ by Bi3+ was suggested to enhance moisture tolerance and photovoltaic performances for FAPbI3. The partial incorporation of Bi in FAPbI3 tuned a more favourable tolerance factor and suppressed the phase transition from black perovskite phase to yellow non-perovskite phase at room temperature. The solar cells based on the incorporation of 5 mol% Bi3+ compounds achieved a substantially improved PCE of 17.78%, which is much higher than that of the controlled device with pure FAPbI3 (13.02%). Moreover, the optimal solar cell showed remarkable stability, maintaining 62.38% of the initial PCE without encapsulation for 1000 h under ambient conditions at 25 °C with relative humidity of 30%. This work further demonstrated the possibility of substituting Pb2+ by non-equivalent elements, thus opening the door for further developments of such promising materials.

Graphical abstract: Enhancing moisture-tolerance and photovoltaic performances of FAPbI3 by bismuth incorporation

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Publication details

The article was received on 07 Oct 2017, accepted on 10 Nov 2017 and first published on 11 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08824H
Citation: J. Mater. Chem. A, 2017,5, 25258-25265
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    Enhancing moisture-tolerance and photovoltaic performances of FAPbI3 by bismuth incorporation

    Y. Hu, T. Qiu, F. Bai, X. Miao and S. Zhang, J. Mater. Chem. A, 2017, 5, 25258
    DOI: 10.1039/C7TA08824H

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