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Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab (ATOMS)
Research Interests
  • Optoelectronic materials synthesis/organic electronics, functionalization of carbonaceous solids, advanced materials chemistry, macromolecular chemistry

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Guest-oriented non-fullerene acceptors for ternary organic solar cells with over 16.0% and 22.7% efficiencies under one-sun and indoor light

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Title
Guest-oriented non-fullerene acceptors for ternary organic solar cells with over 16.0% and 22.7% efficiencies under one-sun and indoor light
Author
Cho, YongjoonKumari, TanyaJeong, SeonghunLee, Sang MyeonJeong, MingyuLee, ByongkyuOh, JiyeonZhang, YoudiHuang, BinChen, LieYang, Changduk
Issue Date
2020-09
Publisher
ELSEVIER
Citation
NANO ENERGY, v.75, pp.104896
Abstract
Given that the ring-fusion strategy can effectively tail the electrical, optical, and structural properties of pi-conjugated materials, we have herein developed Y-series non-fullerene acceptors with a dual acceptor-donor-dual acceptor-type structure, bearing non-fused bare bithiophene (Y-Th2), hexagonal ring-fused bithiophene (Y-BDT), or pentagonal ring-fused bithiophene (Y-CDT) central donor units. Several characterization techniques were applied to perform a comparative investigation of their optical and physical properties and frontier energy levels with respect to the different ring-fusion of the central units. Moreover, for the cascade energy level alignment, the synthesized acceptors were employed as a third component in the PM6:Y6 that served as a binary host platform. The introduction of the optimal amount of Y-Th2 or Y-BDT into the host system improved the device performance. Specifically, Y-Th2 exhibited the best power conversion efficiency (PCE) (16.01%) along with improved photovoltaic parameters, whereas the addition of Y-CDT impaired the PCE. Moreover, the optimized Y-Th2-based ternary organic solar cell achieved a PCE of 22.72% under indoor illumination at 1000 lux. Thus, the in-depth structural, morphological, and electrical analyses not only established a structure-property correlation, but also provided better design criteria for the guest-oriented non-fullerene acceptors for ternary photovoltaic applications, especially for Y6-containing systems.
URI
https://scholarworks.unist.ac.kr/handle/201301/48200
URL
https://www.sciencedirect.com/science/article/pii/S2211285520304535?via%3Dihub
DOI
10.1016/j.nanoen.2020.104896
ISSN
2211-2855
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