Synthesis of Extended Bifluorenylidenes as Acceptors for Thin-Layer Organic Photovoltaics

2014 Fiscal Year Final Research Report

• Project/Area Number: 25620032
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Organic chemistry
• Research Institution: Osaka University
• Principal Investigator: TOBE Yoshito 大阪大学, 基礎工学研究科, 教授 (60127264)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 有機薄膜太陽電池 / アクセプター / ビフルオレニリデン / インデノフルオレン

Outline of Final Research Achievements

To develop new acceptors for thin-film organic solar cells of bulk-hetero-junction type, we synthesized new polycyclcic aromatic hydrocarbons bearing a biindenylidene substructure, which was expected to function as a key component of good acceptors, by dimerization of indenofluorene intermediates generated in situ, and investigated their performance as acceptor components of bulk-hetero-junction potovoltaics. As a result, the target compound was revealed to exhibit better photoenergy conversion efficiency than the commonly used fullerene derivative. However, the synthesis of its derivatives turned out to be limited because of narrow scope of the key reaction with respect to the substituents. The reason for the limited scope was elucidated by theoretical calculations. Moreover, a polycyclic aromatic hydrocarbon having a structure similar to that of the target compound was synthesized.

Free Research Field

有機化学