Effects of Surface Band Bending and Scattering on Thermoelectric Transport in Suspended Bismuth Telluride Nanoplates
作者： Michael Thompson Pettes , Jesse Maassen , Insun Jo , Mark S. Lundstrom , Li Shi
DOI: 10.1021/NL402828S
关键词: Electrical resistivity and conductivity 、 Thermal conductivity 、 Thermoelectric effect 、 Doping 、 Materials science 、 Bismuth telluride 、 Condensed matter physics 、 Scattering 、 Thermoelectric materials 、 Seebeck coefficient
摘要: A microdevice was used to measure the in-plane thermoelectric properties of suspended bismuth telluride nanoplates from 9 25 nm thick. The results reveal a suppressed Seebeck coefficient together with general trend decreasing electrical conductivity and thermal thickness. While is still within range reported for bulk Bi2Te3, total less than 20 thick well below range. These are explained by presence surface band bending diffuse scattering electrons phonons in nanoplates, where pronounced n-type can yield even negative unintentionally p-type doped nanoplates.
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