title: A self-heating 2ω method for Seebeck coefficient measurement of thermoelectric materials.
abstract: A novel and reliable self-heating 2ω method has been developed to measure the Seebeck coefficient of the microscale/nanoscale thermoelectric materials. Based on the analytical solution of the transient heat-conduction equation of the specimen heated by a harmonic current, two measurement modes have been developed: (1) the Seebeck coefficient can be directly extracted from the ratio of experimentally measured 2ω Seebeck voltage to theoretically predicted 2ω temperature drop oscillation; and (2) the Seebeck coefficient can be steadily extracted from the measured 2ω and 3ω voltages. This approach has been applied to a 25.4 μm thick K-type thermocouple and the measured Seebeck coefficient corresponds well with the nominal value.
authors.affiliation: Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing, People's Republic of China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Miao
authors.forename: Weigang
authors.initials: W
authors.lastname: Ma
authors.forename: Xing
authors.initials: X
authors.lastname: Zhang
authors.forename: Zhen
authors.initials: Z
authors.lastname: Li