1. Substitutional doping of hybrid organic-inorganic perovskite crystals for thermoelectrics
- Author
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Emiliano Bilotti, Eugenio Suena Galindez, Lei Su, Fabiola Liscio, Weidong Tang, Tianjun Liu, Sinclair R. Ratnasingham, Mark Baxendale, Kan Chen, Silvia Milita, Martyn A. McLachlan, Kening Wan, Jinshuai Zhang, Michael J. Reece, and Oliver Fenwick
- Subjects
Technology ,Materials science ,Energy & Fuels ,Materials Science ,POWER ,Materials Science, Multidisciplinary ,02 engineering and technology ,010402 general chemistry ,0915 Interdisciplinary Engineering ,01 natural sciences ,law.invention ,Thermal conductivity ,MOBILITIES ,law ,Electrical resistivity and conductivity ,Seebeck coefficient ,Thermoelectric effect ,General Materials Science ,Crystallization ,0912 Materials Engineering ,FIGURE ,Perovskite (structure) ,Science & Technology ,Renewable Energy, Sustainability and the Environment ,business.industry ,Chemistry, Physical ,Doping ,General Chemistry ,ULTRALOW THERMAL-CONDUCTIVITY ,0303 Macromolecular and Materials Chemistry ,021001 nanoscience & nanotechnology ,Thermoelectric materials ,HALIDE PEROVSKITES ,0104 chemical sciences ,Chemistry ,TIN ,Physical Sciences ,MERIT ,Optoelectronics ,GROWTH ,PHASE-TRANSITIONS ,0210 nano-technology ,business - 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.
- Published
- 2020