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Enhanced control of self-doping in halide perovskites for improved thermoelectric performance

Author

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  • Tianjun Liu

    (Queen Mary University of London
    Queen Mary University of London)

  • Xiaoming Zhao

    (Queen Mary University of London)

  • Jianwei Li

    (University College London)

  • Zilu Liu

    (University College London)

  • Fabiola Liscio

    (Istituto per la Microelettronica e Microsistemi (IMM)-Consiglio Nazionale delle Ricerche (CNR))

  • Silvia Milita

    (Istituto per la Microelettronica e Microsistemi (IMM)-Consiglio Nazionale delle Ricerche (CNR))

  • Bob C. Schroeder

    (University College London)

  • Oliver Fenwick

    (Queen Mary University of London
    Queen Mary University of London)

Abstract

Metal halide perovskites have emerged as promising photovoltaic materials, but, despite ultralow thermal conductivity, progress on developing them for thermoelectrics has been limited. Here, we report the thermoelectric properties of all-inorganic tin based perovskites with enhanced air stability. Fine tuning the thermoelectric properties of the films is achieved by self-doping through the oxidation of tin (ΙΙ) to tin (ΙV) in a thin surface-layer that transfers charge to the bulk. This separates the doping defects from the transport region, enabling enhanced electrical conductivity. We show that this arises due to a chlorine-rich surface layer that acts simultaneously as the source of free charges and a sacrificial layer protecting the bulk from oxidation. Moreover, we achieve a figure-of-merit (ZT) of 0.14 ± 0.01 when chlorine-doping and degree of the oxidation are optimised in tandem.

Suggested Citation

  • Tianjun Liu & Xiaoming Zhao & Jianwei Li & Zilu Liu & Fabiola Liscio & Silvia Milita & Bob C. Schroeder & Oliver Fenwick, 2019. "Enhanced control of self-doping in halide perovskites for improved thermoelectric performance," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-13773-3
    DOI: 10.1038/s41467-019-13773-3
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    Cited by:

    1. Xiaoming Zhao & Melissa L. Ball & Arvin Kakekhani & Tianran Liu & Andrew M. Rappe & Yueh-Lin Loo, 2022. "A charge transfer framework that describes supramolecular interactions governing structure and properties of 2D perovskites," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    2. Song Lv & Zuoqin Qian & Dengyun Hu & Xiaoyuan Li & Wei He, 2020. "A Comprehensive Review of Strategies and Approaches for Enhancing the Performance of Thermoelectric Module," Energies, MDPI, vol. 13(12), pages 1-24, June.

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