Journal
MATTER
Volume 4, Issue 7, Pages 2542-2552Publisher
CELL PRESS
DOI: 10.1016/j.matt.2021.06.010
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Funding
- National Natural Science Foundation of China (NSFC) [51825301, 21734001]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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The use of a solvent additive strategy with diiodomethane (DIM) instead of 1,8-diiodooctane (DIO) has been effective in reducing high voltage loss (V-loss) in organic solar cells (OSCs), leading to improved power conversion efficiency (PCE) and open-circuit voltage (V-oc). The approach has also been successfully applied to different blends, achieving high PCEs with reduced V-loss.
High voltage loss (V-loss) limits further improvements of organic solar cells (OSCs), and thus developing effective approaches to reduce V-loss is important. Herein, a solvent additive strategy was employed to reduce V-loss in PM6:L8-BO OSCs. The use of diiodomethane (DIM) instead of 1,8-diiodooctane (DIO) led to a reduction in energetic difference between the single excited state of L8-BO and the charge transfer state in PM6:L8-BO blend, and thereby a reduced V-loss. Meanwhile, the morphology, charge transport property, and quantum efficiency are not deteriorated, Consequently, the DIM-processed OSCs showed a high power conversion efficiency (PCE) of 18.60% (certified as 18.20%) with a high V-oc of 0.893 V, higher than those (PCE = 18.23%, V-oc = 0.869 V) of the DIO-processed devices, representing the highest efficiency for binary OSCs thus far. DIM has also been successfully applied in PM6:BTP-eC9 and PM6:3TP3T-4F blends, and high PCEs with reduced V-loss were also achieved.
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