Unoccupied Electronic Structure at Interface of Organic Semiconductor films

2014 Fiscal Year Final Research Report

• Project/Area Number: 24350013
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Physical chemistry
• Research Institution: Tokyo University of Science
• Principal Investigator: KANAI Kaname 東京理科大学, 理工学部, 准教授 (10345845)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 電子構造 / 有機半導体 / 有機デバイス / 有機薄膜太陽電池 / 光電子分光 / 逆光電子分光

Outline of Final Research Achievements

Organic photovoltaics (OPV) devices containing a polymer/fullerene-based bulk heterojunction, have attracted much interest because of their potential for low-cost, large-area, lightweight, and flexible devices with simple structures. The fullerenes and their derivatives bearing various functional group side chains have been used as n-type semiconductor materials in OPV devices with high-efficiency photoelectric conversion. Electronic structure of the fullerene derivatives has been systematically investigated in this study by photoemission and inverse photoemission spectroscopy. It was found that the electronic structures of the fullerene derivatives strongly depended on structural features, including the type of backbone, number of side chains, side chain length, and functional groups. Fundamental information about the electronic structure of fullerene derivatives obtained in this study can be expected to guide the synthesis of new molecules optimized for high-performance OPVs.

Free Research Field

物性物理学