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In-Situ Growth of Perovskite Stacking Layer for High-Efficiency Carbon-Based Hole Conductor Free Perovskite Solar Cells

Abstract

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

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Supplementary files

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, Accepted Manuscript

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    In-Situ Growth of Perovskite Stacking Layer for High-Efficiency Carbon-Based Hole Conductor Free Perovskite Solar Cells

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

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