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양창덕

Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab.
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Tuning the electron-deficient core of a non-fullerene acceptor to achieve over 17% efficiency in a single-junction organic solar cell

Author(s)
Zhu, CanYuan, JunCai, FangfangMeng, LeiZhang, HuotianChen, HonggangLi, JingQiu, BeibeiPeng, HongjianChen, ShanshanHu, YunbinYang, ChangdukGao, FengZou, YingpingLi, Yongfang
Issued Date
2020-08
DOI
10.1039/d0ee00862a
URI
https://scholarworks.unist.ac.kr/handle/201301/48205
Fulltext
https://pubs.rsc.org/en/content/articlelanding/2020/EE/D0EE00862A#!divAbstract
Citation
ENERGY & ENVIRONMENTAL SCIENCE, v.13, no.8, pp.2459 - 2466
Abstract
Finding effective molecular design strategies to enable efficient charge generation and small energy loss is among the long-standing challenges in developing high performance non-fullerene organic solar cells (OSCs). Recently, we reported Y-series non-fullerene acceptors with an electron-deficient-core-based fused structure (typically Y6), opening a new door to achieve high external quantum efficiency (similar to 80%) while maintaining low energy loss (similar to 0.57 eV). On this basis, further reducing the energy losses and ultimately improving the performance of OSCs has become a research hotspot. In this paper, we design and synthesize a new member of the Y-series acceptor family, Y18, which adopts a fused benzotriazole segment with unique luminescence properties as its electron-deficient core. Compared to Y6, the benzotriazole-based acceptor Y18 exhibits extended optical absorption and higher voltage. Consequently, the device delivers a promising power conversion efficiency of 16.52% with a very low energy loss of 0.53 eV. Further device optimization by exploiting a ternary blend strategy allowed us to achieve a high efficiency of 17.11% (certified as 16.76% by NREL). Y18 may become one of the most important candidate materials for its broader absorption spectra and higher voltage of Y18 (compared to Y6) in the OSCs field.
Publisher
ROYAL SOC CHEMISTRY
ISSN
1754-5692
Keyword
CHARGE-TRANSFER STATESOPEN-CIRCUIT VOLTAGEPOLYMERFABRICATIONLOSSESENERGY

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