Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 121, Issue 12, Pages 6424-6435Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b12068
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Funding
- Aurora-Towards Modern and Innovative Higher Education program
- Cluster of Excellence Engineering of Advanced Materials
- German Research Foundation (DFG) within the framework of its Excellence Initiative
- Solar Technologies go Hybrid (SolTech) project
- Energy Campus Nurnberg (EnCN) - Bavarian state government
- Russian Foundation for Basic Research [15-33-20957, 16-33-01123]
- Program of President of Russian Federation for Support of Young Scientists [MK-5061.2015.3]
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Small push pull molecules attract much attention as prospective donor materials for organic solar cells (OSCs). By chemical engineering, it is possible to combine a number of attractive properties such as broad absorption, efficient charge separation, and vacuum and solution processabilities in a single molecule. Here we report the synthesis and early time photophysics of such a molecule, TPA-2T-DCV-Me, based on the triphenylamine (TPA) donor core and dicyanovinyl (DCV) acceptor end group connected by a thiophene bridge. Using time-resolved photoinduced absorption and photoluminescence, we demonstrate that in blends with [70]PCBM the molecule works both as an electron donor and hole acceptor, thereby allowing for two independent channels of charge generation. The charge-generation process is followed by the recombination of interfacial charge transfer states that takes place on the subnanosecond time scale as revealed by time-resolved photoluminescence and nongeminate recombination as follows from the OSC performance. Our findings demonstrate the potential of TPA-DCV-based molecules as donor materials for both solution-processed and vacuum-deposited OSCs.
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