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Efficient ambient-air-stable HTM-free carbon-based perovskite solar cells with hybrid 2D-3D lead halide photoabsorber

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 implement a series of new 2D-3D hybrid (EA)2(MA)n−1PbnI3n+1 perovskites into 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 in 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 the long-term stability of 93% under ambient conditions during 2160 hours, the 80 °C thermal stability of 80% over 100 hours, and the photo-stability of 92% under continuous 1 sun illumination over 300 hours, which is apparently superior to MAPbI3 device (i.e. ambient stability of 73%; thermal stability of 9%; photo-stability of 67% for 83 hours). To the best of our knowledge, our fabricated C-PSC with 2D-3D halide photoabsorber exhibits the best ambient-air-stable performance among all low-temperature carbon electrode based PSCs so far.

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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, Accepted Manuscript
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    Efficient ambient-air-stable HTM-free carbon-based perovskite solar cells with hybrid 2D-3D lead halide photoabsorber

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

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