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Issue 22, 2019
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In situ growth of perovskite stacking layers for high-efficiency carbon-based hole conductor free perovskite solar cells

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Abstract

The interfacial properties between a perovskite layer and carbon electrode are critical for the photovoltaic performance of carbon electrode-based perovskite solar cells (PSCs). Herein, a methylammonium lead mixed halide (MAPbIxBr3−x) perovskite layer is in situ grown on the top of a methylammonium lead iodide (MAPbI3) perovskite layer forming a MAPbI3/MAPbIxBr3−x perovskite stacking structure (PSS) to improve the interfacial properties at the perovskite/carbon electrode interface. The charge carrier dynamics in both the perovskite and the PSC device induced by the MAPbIxBr3−x perovskite stacking layer are studied using extensive characterization. The charge interfacial recombination at the perovskite/carbon electrode interface is significantly diminished using the PSS within the PSC, resulting in largely improved charge extraction and therefore high photovoltaic performance. The PSS-based PSC shows a power conversion efficiency of up to 16.2% (increased by 43% compared with that of a conventional MAPbI3-based PSC), which is among the highest efficiencies of carbon electrode-based hole conductor free PSCs. Meanwhile, the PSS-based PSC also exhibits good stability under both continuous illumination and storage under dark conditions. This work may provide a new avenue to fine tune the interfacial properties of carbon electrode-based PSCs for further improving their photovoltaic performance.

Graphical abstract: In situ growth of perovskite stacking layers for high-efficiency carbon-based hole conductor free perovskite solar cells

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Publication details

The article was received on 14 Mar 2019, accepted on 14 May 2019 and first published on 16 May 2019


Article type: Paper
DOI: 10.1039/C9TA02772F
J. Mater. Chem. A, 2019,7, 13777-13786

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    In situ growth of perovskite stacking layers for high-efficiency carbon-based hole conductor free perovskite solar cells

    J. Liu, Q. Zhou, N. K. Thein, L. Tian, D. Jia, E. M. J. Johansson and X. Zhang, J. Mater. Chem. A, 2019, 7, 13777
    DOI: 10.1039/C9TA02772F

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