Thermopower measurements of single molecules for thermoelectric thermoelectric conversion devices

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K13673
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Functional solid state chemistry
• Research Institution: Osaka University
• Principal Investigator: TADA HIROKAZU 大阪大学, 基礎工学研究科, 教授 (40216974)
• Co-Investigator(Renkei-kenkyūsha): Ohto Tatshuhiko 大阪大学, 基礎工学研究科, 助教 (90717761) ; Tanaka Shoji 分子科学研究所, 安全衛生管理室, 助教 (20192635)
• Research Collaborator: Lee See Kei ; Ushirokita Hiroaki ; Nobusue Shunpei ; Yamada Ryo
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 単一分子 / 熱起電力 / ゼーベック係数 / 熱伝導度

Outline of Final Research Achievements

Thermopower measurement was carried out for single molecule junctions of Au-oligothiophene-Au. The thermopower increased in proportion to the temperature difference between Au electrodes showing the positive Seebeck coefficient. It was found that holes are majority carriers in this junction. The in-plane thermal conductivity of polymer films was measured using an AC calorimetry method. It was found that the in-plane thermal conductivity was twice as high as that measured perpendicular to the plane by the 3 omega method. In order to prevent the over-evaluation of thermoelectric properties, the electric conductivity, Seebeck coefficient, and thermal conductivity of the specimen should be measured in the same direction.

Free Research Field

分子エレクトロニクス