Journal
ACS ENERGY LETTERS
Volume 4, Issue 11, Pages 2695-2702Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b02146
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Funding
- Center for Light Energy Activated Redox Processes (LEAP), an Energy Frontier Research Center - U.S. DOE, Office of Science, Office of Basic Energy Sciences [DE-SC0001059]
- U.S. DOE, Office of Science, and Office of Basic Energy Sciences [DE-FG02-08ER46536]
- AFOSR [FA9550-18-1-0320]
- NU MRSEC under NSF [DMR-1720139]
- U.S. Department of Commerce, National Institute of Standards and Technology as part of the Center for Hierarchical Materials Design (CHiMaD) [70NANB14H012]
- NSF
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF ECCS-1542205]
- International Institute for Nanotechnology (IIN)
- State of Illinois
- NSF MRI Program [DMR-1229693]
- U.S. DOE [DE-AC02-06CH11357]
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We investigate backbone fluorination effects in bulk-heterojunction (BHJ) polymer solar cells (PSCs) with the fluorine-poor PBDTT-FTTE and fluorine-rich PBDTTF-FTTE donor polymers, paired with the perylenediimide (PDI) 3D propeller acceptor Ph(PDI)(3). The PBDTTF-FTTE:Ph(PDI)(3) devices exhibit a >50% power conversion efficiency (PCE, up to 9.1%) increase versus PBDTT-FTTE:Ph(PDI)(3). This enhancement reflects structurally optimized phase separation due to templating effects, affording reduced energy loss, higher electron mobility, greater free charge lifetimes and yields, and lower bimolecular recombination, as quantified by UPS, AFM, TEM, GIWAXS, SCLC, light intensity dependence measurements, and fs/ns transient absorption (TA) spectroscopy. In PBDTTF-FTTE, the DFT-computed dipole orientations of the ground and excitonic states are nearly antiparallel, explaining the longer free charge lifetimes, minimized recombination, and lowered exciton binding energy. The PBDTTF-FTTE:Ph(PDI)(3) performance enhancement vs that of the fluorine-poor PBDTT-FTTE:Ph(PDI)(3) analogue as well as the overall PSC performance exceeds that of the corresponding PC71BM- and ITIC-Th-based cells.
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