Preparation of switching devices based on single molecules and molecular aggregates

2017 Fiscal Year Final Research Report

• Project Area: Molecular Architectonics: Orchestration of Single Molecules for Novel Function
• Project/Area Number: 25110012
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Osaka University
• Principal Investigator: TADA HIROKAZU 大阪大学, 基礎工学研究科, 教授 (40216974)
• Co-Investigator(Kenkyū-buntansha): 田中 彰治 分子科学研究所, 安全衛生管理室, 助教 (20192635) ; 山田 亮 大阪大学, 基礎工学研究科, 准教授 (20343741) ; 大戸 達彦 大阪大学, 基礎工学研究科, 助教 (90717761)
• Project Period (FY): 2013-06-28 – 2018-03-31
• Keywords: 単一分子エレクトロニクス / 分子接合 / ブレークジャンクション / 分子ダイオード / 磁気抵抗効果

Outline of Final Research Achievements

We have measured current-voltage (I-V) characteristics, thermopower, and magneto-resistance of single molecular junctions using mechanically controllable break junction (MCBJ) and scanning tunneling spectroscope BJ (STMBJ) methods. Molecular junctions based on carbazole oligomers showed a rectification I-V behavior. Molecular orbital deformation induced by electric field between the electrodes resulted in the asymmetric contacts with the electrodes. The magnetoresistance was observed in carbazole-based junctions with Ni electrodes, in which the magneto-resistance ratio was varied depending upon the bias voltage applied. The Seebeck coefficients of molecular junctions were also governed by the contact between molecule and electrode, indicating the importance of the junction structures for electrical properties.

Free Research Field

分子エレクトロニクス