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Contactless measurements of photocarrier transport properties in perovskite single crystals

Author

Listed:
  • Xiwen Gong

    (University of Toronto)

  • Ziru Huang

    (University of Toronto)

  • Randy Sabatini

    (University of Toronto)

  • Chih-Shan Tan

    (University of Toronto)

  • Golam Bappi

    (University of Toronto)

  • Grant Walters

    (University of Toronto)

  • Andrew Proppe

    (University of Toronto
    University of Toronto)

  • Makhsud I. Saidaminov

    (University of Toronto)

  • Oleksandr Voznyy

    (University of Toronto)

  • Shana O. Kelley

    (University of Toronto
    University of Toronto)

  • Edward H. Sargent

    (University of Toronto)

Abstract

The remarkable properties of metal halide perovskites arising from their impressive charge carrier diffusion lengths have led to rapid advances in solution-processed optoelectronics. Unfortunately, diffusion lengths reported in perovskite single crystals have ranged widely – from 3 μm to 3 mm – for ostensibly similar materials. Here we report a contactless method to measure the carrier mobility and further extract the diffusion length: our approach avoids both the effects of contact resistance and those of high electric field. We vary the density of quenchers – epitaxially included within perovskite single crystals – and report the dependence of excited state lifetime in the perovskite on inter-quencher spacing. Our results are repeatable and self-consistent (i.e. they agree on diffusion length for many different quencher concentrations) to within ± 6%. Using this method, we obtain a diffusion length in metal-halide perovskites of 2.6 μm ± 0.1 μm.

Suggested Citation

  • Xiwen Gong & Ziru Huang & Randy Sabatini & Chih-Shan Tan & Golam Bappi & Grant Walters & Andrew Proppe & Makhsud I. Saidaminov & Oleksandr Voznyy & Shana O. Kelley & Edward H. Sargent, 2019. "Contactless measurements of photocarrier transport properties in perovskite single crystals," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-09538-7
    DOI: 10.1038/s41467-019-09538-7
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    Cited by:

    1. Jongchul Lim & Manuel Kober-Czerny & Yen-Hung Lin & James M. Ball & Nobuya Sakai & Elisabeth A. Duijnstee & Min Ji Hong & John G. Labram & Bernard Wenger & Henry J. Snaith, 2022. "Long-range charge carrier mobility in metal halide perovskite thin-films and single crystals via transient photo-conductivity," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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