High-temperature thermoelectric behaviors of Sn-doped n-type Bi2O2Se ceramics

摘要

Sn-doped Bi2O2Se ceramics have been synthesized by spark plasma sintering process. The phase compositional and microstructural analysis indicated that Bi2O2Se exhibited a layered structure with a tetragonal phase. The electrical conductivity was increased by Sn-doping many times with a little effect on the thermal conductivity., The highest ZT value of 0.20 has been achieved at 773 K from Bi1.9Sn0.1O2Se sample, which is about four times larger than that of the pure Bi2O2Se. Our results suggest that Bi2O2Se can be a promising candidate for n-type thermoelectric ceramic.