Enhanced Thermoelectric Performance of Bi2Te2.7Se0.3/Bi2S3 Synthesized by Anion Exchange Method

• DOI: 10.1002/pssr.201900679
• Publication Date: 2020-01-07T20:47:59Z
• Authors: Xi Chen; Fanggong Cai; Chuanrong Liu; Rong Dong; Lanxin Qiu; Lili Jiang; Guocai Yuan; Qinyong Zhang
• Keywords: Figure of Merit; Phonon scattering

Decoupling the electric conductivity, Seebeck coefficient, and thermal conductivity is a core issue to improve properties of thermoelectric materials by tuning electron phonon transport properties. Herein, Bi 2 Te 2.7 Se 0.3 /Bi S 3 heterostructure successfully synthesized simple anion exchange method with as starting material. The heterointerfaces can achieve an effective scattering significant decrease in while maintaining high power factor, resulting enhanced figure merit ( ZT ). By controlling concentration heterointerfaces, carrier‐transporting phonon‐scattering behaviors be simultaneously optimized. A maximum 0.7 obtained at 473 K, which 23% higher than that pure . In addition, average 300–548 K increases from 0.49 0.61, 25%