Development of the polymer having wide absorption band and the control of absorption band and bulk structure using supramolecular technique

2014 Fiscal Year Final Research Report

• Project/Area Number: 25810080
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Polymer chemistry
• Research Institution: Ochanomizu University (2014); National Institute for Materials Science (2013)
• Principal Investigator: NAKANISHI Tatsuaki お茶の水女子大学, お茶大アカデミック・プロダクション, 研究員(産学連携) (70631737)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 多環式複素環化合物 / 電子ドナー / 電子アクセプター / 共役高分子 / ドナーアクセプターコポリマー / 有機薄膜太陽電池

Outline of Final Research Achievements

In this work, the polymers for organic photovoltaics were synthesized based on the donor-acceptor fused molecules. The polymer that consists of a donor-acceptor fused molecule and an electron-donating bithiophene showed CT absorption band from HOMO that delocalized over polymer backbone to LUMO localized on thiadiazole moiety, resulting in expansion of the absorption band in long wavelength region. On the other hand, combination of donor-acceptor fused molecules and an electron accepting diketopyrrolopyrrole exhibited absorption edge over 900 nm and the LUMO energy of around -3.9 eV, which value is nearly lowest energy for electron transfer to take place, and the HOMO energy of around -5.3 eV.
The results provide the ways to expand the absorption band of the polymer and synthesize narrow band gap polymer with low LUMO energy.

Free Research Field

高分子化学