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Issue 33, 2017
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Extra long electron–hole diffusion lengths in CH3NH3PbI3−xClx perovskite single crystals

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Abstract

Long electron–hole diffusion lengths in organolead trihalide compounds play a key role in achieving the remarkable performance of perovskite photovoltaics. Diffusion lengths in solution-grown CH3NH3PbI3 single crystals have been found to be greater than 175 micrometer (μm). Herein, we report the diffusion lengths in CH3NH3PbI3−xClx single crystals exceeding 380 μm under 1 Sun illumination, which is twice that in CH3NH3PbI3 single crystals. Incorporation of chlorine is found to increase the density of trap-states and reduce the valence band level; these two factors, which dominate the carrier recombination and the charge transfer, respectively, are in a competing relation. As a result, the electron–hole diffusion lengths in a CH3NH3PbI3−xClx single crystal with an optimum Cl proportion (x = 0.005) reach the maximum values. This study provides a strategy for the design of perovskite optoelectronics.

Graphical abstract: Extra long electron–hole diffusion lengths in CH3NH3PbI3−xClx perovskite single crystals

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Publication details

The article was received on 23 Jun 2017, accepted on 21 Jul 2017 and first published on 22 Jul 2017


Article type: Paper
DOI: 10.1039/C7TC02802D
Citation: J. Mater. Chem. C, 2017,5, 8431-8435
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    Extra long electron–hole diffusion lengths in CH3NH3PbI3−xClx perovskite single crystals

    F. Zhang, B. Yang, Y. Li, W. Deng and R. He, J. Mater. Chem. C, 2017, 5, 8431
    DOI: 10.1039/C7TC02802D

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