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

Liu, T; Zhao, X; Li, J; Liu, Z; Liscio, F; Milita, S; Schroeder, BC; (2019) Enhanced control of self-doping in halide perovskites for improved thermoelectric performance. Nature Communications , 10 , Article 5750. 10.1038/s41467-019-13773-3. Green open access

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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.

Type: Article
Title: Enhanced control of self-doping in halide perovskites for improved thermoelectric performance
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41467-019-13773-3
Publisher version: https://doi.org/10.1038/s41467-019-13773-3
Language: English
Additional information: This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10088594
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