Development of active molecular device on silicon surface

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K05055
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: Shizuoka University
• Principal Investigator: Shimomura Masaru 静岡大学, 工学部, 教授 (20292279)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 走査トンネル顕微鏡 / 表面化学 / 共吸着

Outline of Final Research Achievements

In order to study the "device with molecular migration" that does not fix a molecule to the electrode, we used the Si(111)-7×7 structure as a template. We studied effect of high-concentration phosphorus doping to the surface structure and co-adsorption of atoms and molecules. It was found that when the sample was treated with the high-concentration phosphorus doping, and was heated in an ultrahigh vacuum, a clean surface structure in which some phosphorus atoms were embedded and a region covered with continuous phosphorus layer were observed. We tried to fabricate a highly-doped sample with a patterned electrode structure, and found that the oxidation rate was extremely high. Molecular migration process by theoretical calculation and metal-molecule co-adsorption experiments on graphene samples are underway.

Free Research Field

表面科学

Academic Significance and Societal Importance of the Research Achievements

本研究によって得られた、高濃度リンドープ基板をアニールした際に得られるリン終端表面は、グラフェンのように２次元層構造であり、表面から伸びたダングリングボンドは共有電子対で充満されている。つまり反応不活性構造であることが予想され、酸素を含む反応性ガス吸着の制御ができる可能性がある。また、ピロールと共吸着させた場合の方が、電子供与生の原子・分子の吸着エネルギーが下がることが分かり、分子の移動を伴う素子における分子移動のメカニズムの理解が深まった。