Elucidation of properties and enhancement of efficiency of nanowire thermoelectric elements

2015 Fiscal Year Final Research Report

• Project/Area Number: 26886016
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Nanomaterials engineering
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Murata Masayuki 国立研究開発法人産業技術総合研究所, 省エネルギー研究部門, 研究員 (80717695)
• Project Period (FY): 2014-08-29 – 2016-03-31
• Keywords: 熱電変換 / ナノワイヤー / 電極接合 / FIB-SEM / 磁場効果

Outline of Final Research Achievements

Ohmic electrical contacts on Bi nanowires ~100 nm in diameter were fabricated in order to measure thermoelectric properties. Focused ion beam and scanning electron micrograph dual beam processing was used to fabricate local electrodes on Bi nanowires. The Seebeck coefficient and electrical resistivity of Bi nanowires were successfully measured using the cryostat equipped with the stirling refrigerator from -120 degree C to the room temperature. Moreover, Hall coefficient, magnetoresistance and magneto-Seebeck coefficient were evaluated experimentally and theoretically. The measured results were successfully explained quantitatively and qualitatively by the calculation model using the Boltzmann equation in the relaxation time approximation with Matthiessen's rule considering the carrier collision at the wire boundary.

Free Research Field

電気電子工学