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Substitutional doping of hybrid organic–inorganic perovskite crystals for thermoelectrics

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Abstract

Hybrid organic–inorganic perovskites have generated considerable research interest in the field of optoelectronic devices. However, there have been significantly fewer reports of their thermoelectric properties despite some promising early results. In this article, we investigate the thermoelectric properties of bismuth-doped CH3NH3PbBr3 (MAPbBr3) single crystals. The high-quality Bi-doped crystals were synthesized by inverse temperature crystallization and it was found that Bi substitutes onto the B-site of the ABX3 perovskite lattice of MAPbBr3 crystals with very little distortion of the crystal structure. Bi doping does not significantly alter the thermal conductivity but dramatically enhances the electrical conductivity of MAPbBr3, increasing the charge carrier density by more than three orders of magnitude. We obtained a negative Seebeck coefficient of −378 μV K−1 for 15% (x = 0.15) Bi-doped MAPb(1−x)BixBr3 confirming n-type doping and also measured the figure of merit, ZT. This work highlights routes towards controlled substitutional doping of halide perovskites to optimise them for thermoelectric applications.

Graphical abstract: Substitutional doping of hybrid organic–inorganic perovskite crystals for thermoelectrics

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Supplementary files

Article information


Submitted
02 Apr 2020
Accepted
24 Jun 2020
First published
25 Jun 2020

This article is Open Access

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Substitutional doping of hybrid organic–inorganic perovskite crystals for thermoelectrics

W. Tang, J. Zhang, S. Ratnasingham, F. Liscio, K. Chen, T. Liu, K. Wan, E. S. Galindez, E. Bilotti, M. Reece, M. Baxendale, S. Milita, M. A. McLachlan, L. Su and O. Fenwick, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/D0TA03648J

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