Journal
ACS ENERGY LETTERS
Volume 3, Issue 3, Pages 669-676Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b01266
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Funding
- KAUST Solar Center Competitive Fund (CCF)
- ONR [N00141512322]
- KAUST's Center Partnership Fund [3321]
- U.S. Department of Energy [DE-AC02-05CH11231]
- Natural Science Foundation of China [21325419, 51373181, 91333204]
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In this Letter, we highlight a system with a well-known polymer donor (PTB7-Th) blended with a narrow band gap nonfullerene acceptor (IEICO-4F) as the active layer and 1-chloronaphthalene (CN) as the solvent additive. Optimization of the photoactive layer nanomorphology yields a short-circuit current density value of 27.3 mA/cm(2), one of the highest values in organic solar cells reported to date, which competes with other types of solution-processed solar cells such as perovskite or quantum dot devices. Along with decent open-circuit voltage (0.71 V) and fill factor values (66%), a power conversion efficiency of 12.8% is achieved for the champion devices. Morphology characterizations elucidate that the origin of this high photocurrent is mainly the increased pi-pi coherence length of the acceptor, the domain spacing, as well as the mean-square composition variation of the blend. Optoelectronic measurements confirm a balanced hole and electron mobility and reduced trap-assisted recombination for the best devices.
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