期刊
ADVANCED SCIENCE
卷 7, 期 15, 页码 -出版社
WILEY
DOI: 10.1002/advs.202000149
关键词
liquid-crystalline molecules; morphology; organic solar cells; ternary structures
资金
- Research Grants Council of Hong Kong [15218517, C5037-18G]
- Shenzhen Science and Technology Innovation Commission [JCYJ20170413154602102]
- Hong Kong Polytechnic University [1-ZE29]
- National Youth Thousand Program Project [R52A199Z11]
- National Special Funds for Repairing and Purchasing Scientific Institutions [Y72Z090Q10]
- Artificial Intelligence Key Project of Chongqing [cstc2017rgzn-zdyfX0030]
- DOE, Office of Science, and Office of Basic Energy Sciences
- [YW3Y]
Achieving an ideal morphology is an imperative avenue for enhancing key parameters toward high-performing organic solar cells (OSCs). Among a myriad of morphological-control methods, the strategy of incorporating a third component with structural similarity and crystallinity difference to construct ternary OSCs has emerged as an effective approach to regulate morphology. A nematic liquid-crystalline benzodithiophene terthiophene rhodamine (BTR) molecule, which possesses the same alkylthio-thienyl-substituted benzo moiety but obviously stronger crystallinity compared to classical medium-bandgap polymeric donor PM6, is employed as a third component to construct ternary OSCs based on a PM6:BTR:Y6 system. The doping of BTR (5 wt%) is found to be enough to improve the OSC morphology-significantly enhancing the crystallinity of the photoactive layer while slightly reducing the donor/acceptor phase separation scale simultaneously. Rarely is such a morphology evolution reported. It positively affects the electronic properties of the device-prolongs the carrier lifetime, shortens the photocurrent decay time, facilitates exciton dissociation, charge transport, and collection, and ultimately boosts the power conversion efficiency from 15.7% to 16.6%. This result demonstrates that the successful synergy of liquid-crystalline small-molecule and polymeric donors delicately adjusts the active-layer morphology and refines device performance, which brings vibrancy to the OSC research field.
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