Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 120, Issue 7, Pages 3602-3611Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b10064
Keywords
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-FG02-00ER45810]
- Northwestern University Materials Research and Engineering Center (NU-MRSEC) - NSF [DMR-1121262]
- Northwestern Undergraduate Summer Research Grant
- Meister Family Undergraduate Research Grant
- McCormick Undergraduate Research Grant
- National Science Foundation Graduate Research Fellowship [DGE-1324585]
- IMSERC NMR [NSF CHE-1048773]
- U.S. DOE [DE-AC02-06CH11357]
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
- Northwestern University
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The power conversion efficiency of organic solar cells (OSCs) could benefit from systematic studies to improve bulk heterojunction (BHJ) morphology by modifying donor compounds. Supramolecular self-assembly is an attractive strategy to combine the beneficial properties of polymeric donors, such as a well-controlled morphology, with the homogeneous composition of small molecule donors for OSCs. We report here on two tripodal star-shaped small-molecule donor compounds based on diketopyrrolopyrrole (DPP) side chains for solution-processed BHJ OSCs. The tripod molecules were found not to aggregate in solution or form crystalline domains in thin films when a branched alkyl chain (2-ethylhexyl) substituent was used, whereas linear (docedecyl) alkyl chains promote the formation of one-dimensional (1D) nanowires and more crystalline domains in the solid state. We demonstrate that the 1D self-assembly of these tripods enhances the performance of the corresponding solution-processed OSCs by 50%, which is attributed to the significant increase in the fill factor of devices resulting from a reduction of trap states.
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