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Issue 45, 2018
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Efficient ambient-air-stable HTM-free carbon-based perovskite solar cells with hybrid 2D–3D lead halide photoabsorbers

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Abstract

Hole transport material (HTM)-free carbon-based perovskite solar cells (C-PSCs) have shown much promise because of their excellent stability and low cost. However, the most commonly used three-dimensional (3D) MAPbI3 photoabsorber is ambient-unstable and incompatible with the low-cost mass-production of C-PSCs. Considering the proven operational stability of two-dimensional (2D) perovskites, we herein attempt to use a series of new 2D–3D hybrid (EA)2(MA)n−1PbnI3n+1 perovskites in C-PSCs. We find that the fabricated (EA)2(MA)n−1PbnI3n+1 films (n = 20, 10, and 6) exhibit extremely improved ambient and photo-stability under 60 day-ambient conditions. The HTM-free C-PSCs with a structure of ITO/C60/(EA)2(MA)n−1PbnI3n+1/C retain outstanding power conversion efficiency over 11.88%. Particularly, by tuning the stoichiometry of (EA)2(MA)n−1PbnI3n+1 to n = 6, the n6-2D device maintains a long-term stability of 93% under ambient conditions after 2160 hours, a thermal stability of 80% after heating at 80 °C over 100 hours, and a photo-stability of 92% under continuous 1 sun illumination over 300 hours, which are apparently superior to those of the MAPbI3 device (i.e. ambient stability of 73%; thermal stability of 9%; photo-stability of 67% after 83 hours). To the best of our knowledge, our fabricated C-PSC with the 2D–3D halide photoabsorber exhibits the best ambient-air-stable performance among all low-temperature carbon electrode-based PSCs reported so far.

Graphical abstract: Efficient ambient-air-stable HTM-free carbon-based perovskite solar cells with hybrid 2D–3D lead halide photoabsorbers

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Publication details

The article was received on 13 Aug 2018, accepted on 12 Oct 2018 and first published on 13 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA07836J
Citation: J. Mater. Chem. A, 2018,6, 22626-22635
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    Efficient ambient-air-stable HTM-free carbon-based perovskite solar cells with hybrid 2D–3D lead halide photoabsorbers

    J. Zhou, Z. Ye, J. Hou, J. Wu, Y. Zheng and X. Tao, J. Mater. Chem. A, 2018, 6, 22626
    DOI: 10.1039/C8TA07836J

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