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N-alkyl chain modification in dithienobenzotriazole unit enabled efficient polymer donor for high-performance non-fullerene solar cells

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Journal of Energy Chemistry 2022年第3期31卷 382-389,I0011页

作者： Jiaxin Xu Hexiang Feng Yuanying Liang Haoran Tang Yixu Tang Zurong Du Zhicheng Hu Fei Huang Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640GuangdongChina

Molecular design of either polymer donors or acceptors is a promising strategy to tune the morphology of the active layer of organic solar cells,enabling a high-performance ***,developing novel polymer donors is an alternative method to obtain high photovoltaic ***,we present a facile side-chain engineering on the dithiophenobenzotriazole(DTBTz)unit of newly-designed polymer donors(named p BDT-DTBTz-EH and p BDT-DTBTz-Me)to boost the performance of non-fullerene solar *** with p BDT-DTBTz-EH with long N-alkyl side chains,p BDT-DTBTz-Me with a short methyl exhibits stronger molecular aggregation,higher absorption coefficient,and preferred face-on orientation *** a consequence,p BDT-DTBTz-Me based devices achieve an optimal power conversion efficiency of 15.31%when donors are paired with the narrow bandgap acceptor Y6,which is superior to that of p BDT-DTBTz-EH based devices(9.17%).Additionally,the p BDT-DTBTz-Me based devices manifest more effective charge separation and transfer than p BDT-DTBTz-EH based *** results indicate that fine-tuning side chains of polymer donors provide new insights for the design of high-performance polymer donors in non-fullerene solar cells.

关键词： non-fullerene solar cells Wide bandgap polymer donor Side-chain engineering morphology Dithienobenzotriazole

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An end-capped strategy for crystalline polymer donor to improve the photovoltaic performance of non-fullerene solar cells

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Science China Chemistry 2022年第5期65卷 964-972页

作者： Bing Zheng Yuchen Yue Jianling Ni Rui Sun Jie Min Jingxia Wang Lei Jiang Lijun Huo School of Chemistry Beihang UniversityBeijing 100191China Key Laboratory of Bioinspired Smart Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China The Institute for Advanced Studies Wuhan UniversityWuhan 430072China

The effects of end-capped modifications of a polymer donor with high molecular weight on non-fullerene solar cells are largely ignored,even if the chain-end-functionalized method of conjugated polymers is an effective strategy in modulating polymeric optical-electronic *** this study,we design and synthesize an end-capped polymer,PM6TPO,via a reaction with the parent polymer ***,the conventional detection methods of X-ray photoelectron spectroscopy(XPS),matrix-assisted laser desorption/ionization time-of-flight(MALDI-TOF),and ^(1)H nuclear magnetic resonance(^(1)H NMR) were replaced by simple solution-based inductively coupled plasma-mass spectrometry(ICP-MS) to evaluate the end-capped efficacy of *** introducing end-capped groups on a high molecular weight polymer donor,we could finely tune the aggregated behavior,strengthen the miscibility between the donor and acceptor without sacrificing the strong aggregated properties,and reduce the non-radiative recombination with a lower energy ***,the PM6TPO-based organic solar cell(OSC)realized a higher open-circuit voltage of 0.843 V and PCE of 17.26% than that of the non-end-capped parent polymer,PM6(0.824 V and 16.21%,respectively).This work not only provides a straightforward method for verifying the end-capped efficacy of a high molecular weight polymer but also indicates a new research direction for improving the photovoltaic performance of non-fullerene-based solar cells.

关键词： end-capped polymer ICP-MS miscibility energy loss non-fullerene solar cells

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Molecular design towards two-dimensional electron acceptors for efficient non-fullerene solar cells

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Journal of Energy Chemistry 2020年第12期29卷 190-198页

作者： Yan Liu Zixian Liu Zhicheng Hu Yuanying Liang Zhenfeng Wang Zhongxin Chen Fei Huang Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640GuangdongChina

non-fullerene polymer solar cells(NF-PSCs) have gained wide attention recently. Molecular design of non-fullerene electron acceptors effectively promotes the photovoltaic performance of NF-PSCs. However,molecular electron acceptors with 2-dimensional(2 D) configuration and conjugation are seldom ***, we designed and synthesized a series of novel 2 D electron acceptors for efficient NF-PSCs. With rational optimization on the conjugated moieties in both vertical and horizontal direction, these 2 D electron acceptors showed appealing properties, such as good planarity, full-spectrum absorption, high absorption extinction coefficient, and proper blend morphology with donor polymer. A high PCE of 9.76%was achieved for photovoltaic devices with PBDB-T as the donor and these 2 D electron acceptors. It was also found the charge transfer between the conjugated moieties in two directions of these 2 D molecules contributes to the utilization of absorbed photos, resulting in an exceptional EQE of 87% at 730 nm. This work presents rational design guidelines of 2 D electron acceptors, which showed great promise to achieve high-performance non-fullerene polymer solar cells.

关键词： Two-dimensional molecules Perylene diimide Electron acceptors Molecular design non-fullerene solar cells

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