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Enhancing Moisture-tolerance and Photovoltaic Performances for FAPbI3 by Bismuth Incorporation

Abstract

The power conversion efficiency (PCE) of perovskite-based solar cell has already exceeded of 22% due to their unique optoelectronic properties. However, the long-term ambient air stability as an achilles heel of such promising photovoltaic material has to be solved for the commercialization development. Herein, a facile method that partially substituting B-site Pb2+ by Bi3+ cations has been 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 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 demonstrates the possibility of substituting the Pb2+ by using non-equivalence element, and opens a new door for further developments of such promising material.

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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, Accepted Manuscript
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    Enhancing Moisture-tolerance and Photovoltaic Performances for FAPbI3 by Bismuth Incorporation

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

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