Kang, Min-Su Roh, Im-Jun Lee, Yun Goo Baek, Seung-Hyub Kim, Seong Keun Ju, Byeong-Kwon Hyun, Dow-Bin Kim, Jin-Sang Kwon, Beomjin 2024-01-20T04:03:59Z 2024-01-20T04:03:59Z 2021-09-05 2016-05-20 2045-2322 https://pubs.kist.re.kr/handle/201004/124059 Although the Harman method evaluates the thermoelectric figure-of-merit in a rapid and simple fashion, the accuracy of this method is affected by several electrical and thermal extrinsic factors that have not been thoroughly investigated. Here, we study the relevant extrinsic effects and a correction scheme for them. A finite element model simulates the electrical potential and temperature fields of a sample, and enables the detailed analysis of electrical and thermal transport. The model predicts that the measurement strongly depends on the materials, sample geometries, and contact resistance of the electrodes. To verify the model, we measure the thermoelectric properties of Bi-2-Te-3 based alloys with systematically varied sample geometries and either with a point or a surface current source. By comparing the model and experimental data, we understand how the measurement conditions determine the extrinsic effects, and, furthermore, able to extract the intrinsic thermoelectric properties. A correction scheme is proposed to eliminate the associated extrinsic effects for an accurate evaluation. This work will help the Harman method be more consistent and accurate and contribute to the development of thermoelectric materials. English NATURE PUBLISHING GROUP FIGURE MERIT Correction of the Electrical and Thermal Extrinsic Effects in Thermoelectric Measurements by the Harman Method Article 10.1038/srep26507 1 SCIENTIFIC REPORTS, v.6 SCIENTIFIC REPORTS 6 scie scopus 000376191000001 2-s2.0-84970031488 Multidisciplinary Sciences Science & Technology - Other Topics Article FIGURE MERIT Characterization and analytical techniques Thermoelectric devices and materials