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

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 (MAPbI x Br 3−x ) perovskite layer is in situ grown on the top of a methylammon...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (22), p.13777-13786
Main Authors: Liu, Jianhua, Zhou, Qisen, Thein, Nan Kyi, Tian, Lei, Jia, Donglin, Johansson, Erik M. J., Zhang, Xiaoliang
Format: Article
Language:English
Subjects:
Carbon
Conductors
Current carriers
Electrodes
Energy conversion efficiency
Interfacial properties
Iodides
Lead
Perovskites
Photovoltaic cells
Photovoltaics
Recombination
Solar cells
Stacking
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Summary: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 (MAPbI x Br 3−x ) perovskite layer is in situ grown on the top of a methylammonium lead iodide (MAPbI 3 ) perovskite layer forming a MAPbI 3 /MAPbI x Br 3−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 MAPbI x Br 3−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 MAPbI 3 -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.
ISSN:2050-7488
2050-7496
DOI:10.1039/C9TA02772F