A carbon-oxygen-bridged ladder-type building block for efficient donor and acceptor materials used in organic solar cells

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2017,（19）
• 页码范围: 1331-1336
• 页数: 6页
• 语种: 英文

摘要

A carbon-oxygen-bridged ladder-type donor unit (CO5) was invented and prepared via an "intramolecular demethanolization cyclization" approach.Its single crystal structure indicates enhanced planarity compared with the carbon-bridged analogue indacenodithiophene (IDT).Owing to the stronger electron-donating capability of CO5 than IDT,CO5-based donor and acceptor materials show narrower bandgaps.A donor-acceptor (D-A) copolymer donor (PCO5TPD) and an A-D-A nonfullerene acceptor (CO5IC) demonstrated higher performance than IDT-based counterparts,PIDTTPD and IDTIC,respectively.The better performance of CO5-based materials results from their stronger light-harvesting capability and higher charge-carrier mobilities.