Substitutional doping of hybrid organic–inorganic perovskite crystals for thermoelectrics. Issue 27 (1st July 2020)

• Record Type: Journal Article
• Authors: Tang, Weidong; Zhang, Jinshuai; Ratnasingham, Sinclair; Liscio, Fabiola; Chen, Kan; Liu, Tianjun; Wan, Kening; Galindez, Eugenio Suena; Bilotti, Emiliano; Reece, Mike; Baxendale, Mark; Milita, Silvia; McLachlan, Martyn A.; Su, Lei; Fenwick, Oliver
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 27(2020)
• Page Start: 13594
• Page End: 13599
• Publication Date: 2020-07-01
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta03648j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : This work highlights routes towards controlled substitutional doping of halide perovskites on the B-site to optimise their thermoelectric properties. 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 CH3 NH3 PbBr3 (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 ) Bi x Br3 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.