Journal
SCIENCE BULLETIN
Volume 62, Issue 19, Pages 1331-1336Publisher
SCIENCE PRESS
DOI: 10.1016/j.scib.2017.09.017
Keywords
Ladder-type units; Cyclization reaction; Planarity; Charge-carrier mobility; Organic solar cells
Categories
Funding
- National Natural Science Foundation of China [U1401244, 21374025, 21372053, 21572041, 51503050, 51673218]
- National Key Research and Development Program of China [2017YFA0206600]
- State Key Laboratory of Luminescent Materials and Devices [2016-skllmd-05]
- Youth Association for Promoting Innovation (CAS)
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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. (C) 2017 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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