Symmetric and asymmetric non-fullerene acceptors cooperate synergistically for ternary optoelectronic devices

IF 13.3 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Minyoung Lim, Xiaoling Ma, Yelim Kang, Min Hun Jee, Soonyong Lee, Sang Young Jeong, Tae Hyuk Kim, Jae Won Shim, Fujun Zhang, Han Young Woo
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引用次数: 0

Abstract

We report two new asymmetric non-fullerene acceptors, A-YBO-2F and A-YBO-2Cl, as third components in organic solar cells (OSCs) and organic photodetectors (OPDs). These asymmetric D-A acceptors, with one terminal group removed based on a same π-conjugated backbone, exhibit blue-shifted complementary absorption and shallower energy levels compared to symmetric A-D-A acceptors (Y6). Additionally, they show good miscibility with the A-D-A type Y6, forming an alloy-like phase with Y6 that features an elevated conduction band and enhanced molecular packing through stronger dipole–dipole interactions. This leads to significant improvement in the photoelectrical characteristics of OSCs and reduced dark current in OPDs. As a result, the ternary OSC with A-YBO-2Cl achieves a power conversion efficiency of 18.37 %, surpassing the 16.95 % of the binary device. Additionally, the ternary OPD with A-YBO-2Cl shows a significantly lower dark current density of 1.06 pA cm−2 at V → 0 V and a higher specific detectivity of 6.14 × 1012 Jones at 808 nm compared to its binary counterpart. These findings demonstrate that combining asymmetric D-A and symmetric A-D-A acceptors with a same conjugated framework effectively controls miscibility, energy levels, morphology, and performance in both OSCs and OPDs, offering a promising strategy for advancing organic semiconductor technology.

Abstract Image

对称和非对称非富勒烯受体协同合作的三元光电器件
我们报道了两种新的不对称非富勒烯受体,A-YBO-2F和A-YBO-2Cl,作为有机太阳能电池(OSCs)和有机光电探测器(opd)的第三组分。与对称的a -D-A受体相比,这些不对称的D-A受体在相同的π共轭主链上去除一个末端基团,表现出蓝移的互补吸收和更浅的能级(Y6)。此外,它们与A-D-A型Y6表现出良好的混相,与Y6形成类似合金的相,通过更强的偶极子-偶极子相互作用,具有更高的传导带和增强的分子堆积。这导致了osc光电特性的显著改善,并减少了opd中的暗电流。结果表明,含a - ybo - 2cl的三元OSC器件的功率转换效率为18.37 %,超过了二元器件的16.95 %。此外,含有a - ybo - 2cl的三元OPD在电压 → 0 V处的暗电流密度为1.06 pA cm−2,在808 nm处的比探测率为6.14 × 1012 Jones。这些发现表明,将不对称的D-A和对称的a -D-A受体与相同的共轭框架结合,可以有效地控制OSCs和opd中的混相性、能级、形态和性能,为推进有机半导体技术提供了一种有前途的策略。
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来源期刊
Chemical Engineering Journal
Chemical Engineering Journal 工程技术-工程:化工
CiteScore
21.70
自引率
9.30%
发文量
6781
审稿时长
2.4 months
期刊介绍: The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.
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