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An Air and Thermally Stable Perovskite Solar Cells with CVD-Graphene as Blocking Layers

Abstract

Poor air and thermal stability of organic-inorganic halide perovskite solar cells have hindered their real applications. Here we report the insertion of a chemically vapor deposited graphene between Au electrode and spiro-OMeTAD in planar perovskite solar cells to block the diffusion of air and Au into perovskite layer, where the single layer graphene is transferred into the devices by a simple laminated process. After ageing in 45% humidity air for 96 h or thermal annealing at 80 oC for 12 h, more than 94% PCE of the devices with graphene can be maintained, which is much better than that of devices without graphene (~57%). The improved stability of devices with the graphene layer is attributed to the reduction of carrier recombination from decomposition of perovskite layer in air or Au doping into perovskite layer under annealing treatment. Therefore, graphene is a promising ultra-thin barrier against air and metal diffusion, and has the potential application in photovoltaic devices, integrated circuit chips and light emitting diodes.

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Publication details

The article was received on 16 Feb 2017, accepted on 12 May 2017 and first published on 16 May 2017


Article type: Paper
DOI: 10.1039/C7NR01186E
Citation: Nanoscale, 2017, Accepted Manuscript
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    An Air and Thermally Stable Perovskite Solar Cells with CVD-Graphene as Blocking Layers

    X. Hu, H. Jiang, J. Li, J. Ma, D. Yang, Z. Liu, F. Gao and S. F. Liu, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR01186E

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