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Narrow bandgap molecular dyads incorporating y-series acceptor backbones for efficient single-molecular organic solar cells

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Science China Chemistry 2023年第11期66卷 3205-3212页

作者： yuan Gao Bo Xiao Shanshan Wang Mingxia Chen Wei Wang Xinrong yang yiming Shao Rui Sun Jie Min The Institute for Advanced Studies Wuhan UniversityWuhan 430072China

The performance of organic solar cells(OSCs)is mainly related to the bulk heterojunction(BHJ)microstructure of specific active layer systems,which is often in a metastable state.A promising strategy to address the abovementioned shortcomings of BHJs is to develop single-component active layer *** to the single-component small molecule materials with defined chemical structures generally exhibit poor absorption spectra,herein we first introduced narrow bandgap y-series acceptors into the molecular skeleton of single-component materials,and designed two molecular dyads,SM-Et-1y and *** optical bandgaps(E_g~(opt)s)of the two dyads are 1.364 and 1.361 eV,respectively,which are much smaller than those of previously reported single-component ***,the SM-Et-2y-based single-component OSCs(SCOSCs)showed a power conversion efficiency(PCE)of 5.07%,superior to SM-Et-1y(2.53%),which is one of the highest PCEs reported for SCOSCs to ***,both SM-Et-1y-and SM-Et-2y-based devices exhibited excellent photo-stability,retaining over 90%of their initial performance after 250 h of continuous *** results provide a deeper understanding of the molecular backbone and a guiding principle for the rational design or selection of non-fullerene single-component materials with suitable donor/acceptor ratios.

关键词： donor-acceptor dyads single-material organic solar cells y-series acceptors operational stability optical bandgap

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Asymmetric molecular engineering in recent nonfullerene acceptors for efficient organic solar cells

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Chinese Chemical Letters 2023年第10期34卷 48-54页

作者： Jinsheng Song Zhishan Bo Engineering Research Center for Nanomaterials Henan UniversityKaifeng 475004China Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China College of Textiles&Clothing Qingdao UniversityQingdao 266071China

Nonfullerene acceptors(NFAs),which usually possess symmetric skeletons,have drawn great attention in recent years due to their pronounced advantages over the fullerene ***,breaking the symmetry of NFAs could fine tune the molecular dipole,solubility,energy level,intermolecular interaction,molecular packing,crystallinity,etc.,and give rise to improved photovoltaic ***,there are three main strategies for the design of asymmetric *** review highlights the recent advances of high-performance asymmetric NFAs and briefly outlooks the materials exploration for the future.

关键词： Asymmetric strategy Organic photovoltaics Nonfullerene acceptor Side chain engineering y-series acceptors

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