Kwon, Beomjin Baek, Seung-Hyub Kim, Seong Keun Kim, Jin-Sang 2024-01-20T10:02:38Z 2024-01-20T10:02:38Z 2021-09-05 2014-04 0034-6748 https://pubs.kist.re.kr/handle/201004/126922 Harman method is a rapid and simple technique to measure thermoelectric properties. However, its validity has been often questioned due to the over-simplified assumptions that this method relies on. Here, we quantitatively investigate the influence of the previously ignored parasitic thermal effects on the Harman method and develop a method to determine an intrinsic ZT. We expand the original Harman relation with three extra terms: heat losses via both the lead wires and radiation, and Joule heating within the sample. Based on the expanded Harman relation, we use differential measurement of the sample geometry to measure the intrinsic ZT. To separately evaluate the parasitic terms, the measured ZTs with systematically varied sample geometries and the lead wire types are fitted to the expanded relation. A huge discrepancy (similar to 28%) of the measured ZTs depending on the measurement configuration is observed. We are able to separately evaluate those parasitic terms. This work will help to evaluate the intrinsic thermoelectric property with Harman method by eliminating ambiguities coming from extrinsic effects. (C) 2014 AIP Publishing LLC. English AMER INST PHYSICS MERIT CONDUCTIVITY FIGURE SUPERLATTICE TRANSPORT DEVICES Impact of parasitic thermal effects on thermoelectric property measurements by Harman method Article 10.1063/1.4870413 1 REVIEW OF SCIENTIFIC INSTRUMENTS, v.85, no.4 REVIEW OF SCIENTIFIC INSTRUMENTS 85 4 scie scopus 000335920600074 2-s2.0-84898407252 Instruments & Instrumentation Physics, Applied Instruments & Instrumentation Physics Article MERIT CONDUCTIVITY FIGURE SUPERLATTICE TRANSPORT DEVICES Thermoelectric Harman method Parasitic thermal effect Intrinsic ZT