Quantitative characterization of charge transport properties in organic semiconductors by precise intermolecular band-dispersion measurement

2014 Fiscal Year Final Research Report

• Project/Area Number: 24685032
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Functional materials/Devices
• Research Institution: Institute for Molecular Science
• Principal Investigator: YAMANE Hiroyuki 分子科学研究所, 光分子科学研究領域, 助教 (50402459)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 有機半導体 / 電子状態 / 角度分解光電子分光法 / シンクロトロン光

Outline of Final Research Achievements

Electric conduction in organic semiconductors is one of the fundamental and important processes in organic electronics such as field-effect transistors and photovoltaic cells. The energy-vs-wavevector relation (i.e., energy band dispersion), obtained by angle-resolved photoemission spectroscopy, is a fundamental basis for understanding charge transport mechanisms of solids.
In the case of organic semiconductors, the energy band dispersion, originating from the quite weak intermolecular interaction (so-called intermolecular band dispersion), is difficult to observe precisely. By overcoming such a serious problem, in the present work, we have realized the precise and systematic examination of the intermolecular band dispersion. Based on the chemical substitution of molecules in the precise band-dispersion measurement, we have succeeded in the quantitative characterization of the correlation between the charge transport property and the crystalline structure in organic semiconductors.

Free Research Field

有機薄膜・界面