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Chinese Chemical Letters 2021年第1期32卷 229-233页

作者： Yu Chen Honggang Chen Huilan Guan Wei Liu Zhe Li Hui Liu Yongfang Li yingping zou College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Institute of Chemistry Chinese Academy of SciencesBeijing 100190China

Recent advances in non-fullerene acceptors(NFAs),typically Y6,have driven power conversion efficiency(PCE) of single-junction orga nic solar cells(OSCs) over 16%.Mea nwhile,it becomes essential to know how to adopt simple strategies to further improve device *** this work,a new A-DA'D-A acceptor derivative,Y19-N3 employing 3-ethylheptyl branched at the 3^(rd)-position instead of 2-ethylhexyl on the pyrroles of Y19 is *** selection of an appropriate solvent in casting device is implemented to maximize the photovoltaic ***-T:Y19-N3-based OSCs treated with a ternary solvent of CF/CB(1:3,v/v) and 0.8% DIO exhibit the optimal PCE of 13.77% here,with the significantly improved V_(oc)(0.78 V) and FF(0.72) as well as the high J_(sc)(24.46 mA/cm^(2)).Further characterizations indicate that this ternary solvent-treated PBDB-T/Y19-N3 film exhibits the more appropriate morphological features with the highly efficient charge generation and collection as well as the more balanced electron and hole *** work combines molecular design and device engineering to improve the photovoltaic properties,which is important to the development of OSCs.

关键词： Organic solar cells Side chain engineering Ternary solvent Increased efficiency Balanced mobilities

Manipulating molecular aggregation and crystalline behavior of A-DA’D-A type acceptors by side chain engineering in organic solar cells

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Aggregate 2022年第3期3卷 13-18页

作者： Wei Liu Rui Zhang Qingya Wei Can Zhu Jun Yuan Feng Gao yingping zou State Key Laboratory of Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangshaP.R.China Department of Physics Chemistry and Biology(IFM)Linköping UniversityLinköpingSweden Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijingP.R.China

Alkyl chains engineering plays an important role in photovoltaic materials for organic solar ***,three A-DA’D-A(acceptor–donor–acceptor’–donor–acceptor)type acceptors named Y6,Y6-C4,and Y6-C5 with different branching position on the pyrrole motif are discussed and the relationship between molecular aggregation,crystalline,and device performance are systematically *** distance between the branching position and the main backbone affects their optical absorption and energy levels.Y6-C4 and Y6-C5 with the branching position at the fourth and fifth carbon of the alkyl chain show blue-shifted absorption and increased electrochemical bandgaps,compared with Y6 with the branching position at the second carbon of the alkyl side *** addition,this distance influences the molecular aggregation and crystalline behavior of the donor/acceptor *** with Y6-C4,Y6-C5 possesses a stronger crystalline and aggregate ability in the blends with a lower non-radiative energy loss,which results in a higher open circuit voltage(Voc)of 0.88 ***,Y6-C5-based binary device achieved a high power conversion efficiency up to 16.73%with afill factor(FF)of *** results demonstrate that the side chain engineering is an effective strategy for tuning the molecular aggregation and crystalline to improve photovoltaic performance of the A-DA’D-A type acceptors.

关键词： A-DA’D-A type acceptor aggregation side chain engineering

Diflurobenzothiadiazole core-based noncovalently fused small molecule acceptor exhibiting over 12% efficiency and high fill factor

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Journal of Energy Chemistry 2020年第12期29卷 7-13页

作者： Qin Chang Honggang Chen Jun Yuan Yunbin Hu Jiefeng Hai Wei Liu Fangfang Cai Juan Hong Xuxian Xiao yingping zou College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials College of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004GuangxiChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina

The versatility and flexibility of organic photoelectric materials endow organic photovoltaic cells fine function modulation and huge commercial potential. In this work, a new noncovalent fused-ring small molecule acceptor(SMA) BID-4 F has been synthesized for high-efficient organic solar cells(OSCs). BID-4 F consists of a diflurobenzothiadiazole(DFBT) core, ladder-like indacenodithiophene(IDT) spacers, and dicyanoindanone electron-withdrawing end groups, which are supposed to be conformationally interlocked by noncovalent interactions, leading to good molecular planarity. In addition, compact solid state stacking was revealed by UV–vis–NIR absorption spectrum. The optimized PM6:BID-4 F based device delivers an eminent power conversion efficiency(PCE) of 12.30% with a high open-circuit voltage(Voc) of 0.92 V and a high fill factor(FF) of 74.3%. Most importantly, the PCE and FF are among one of the highest values reported for the OSCs based on the unfused-ring SMAs. Overall, our work demonstrates that the unfused ring central framework with high molecular planarity through noncovalent interactions provides a good strategy to construct highly efficient SMAs.

关键词： Diflurobenzothiadiazole core Noncovalently fused small molecule acceptor High efficiency High fill factor

High efficiency ternary organic solar cells enabled by compatible dual-donor strategy with planar conjugated structures

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Science China Chemistry 2020年第7期63卷 917-923页

作者： Sanhui Chen Tingting Yan Billy Fanady Wei Song Jinfeng Ge Qiang Wei Ruixiang Peng Guohui Chen yingping zou Ziyi Ge College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Ternary organic solar cells(OSCs) have received extensive attention for improving the power conversion efficiency(PCE) of organic photovoltaics(OPVs). In this work, a novel donor material(ECTBD) consisting of benzodithiophene(BDT) central electron donor unit was developed and synthesized. The small molecular donor has the same central unit as PM6. The addition of ECTBD into PM6:Y6 system could improve the morphology of active blend layer. In addition, ECTBD showed good morphologically compatibility when blending with PM6:Y6 host, resulting in the improvement of fill factor and current density. As a result, the ternary devices based on PM6:ECTBD:Y6 ternary system achieved a highest PCE of 16.51% with fill factor of 76.24%, which was much higher than that of the binary devices(15.7%). Overall, this work provided an effective strategy to fabricate highly efficient ternary organic solar cells through design of the novel small molecular donor as the third component.

关键词： ternary organic solar cells small molecule donor high fill-factor the same central unit strategy morphology

Synergetic Alkoxy Side-Chain and Chlorine-Contained End Group Strategy toward High Performance Ultra-Narrow Bandgap Small Molecule Acceptors

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Chinese Journal of Chemistry 2023年第20期41卷 2664-2670页

作者： Qingya Wei Songting Liang Beibei Qiu Wei Liu Xiang Xu Xinhui Lu Yuang Fu Jun Yuan yingping zou State Key Laboratory of Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha Hunan 410083China Key Laboratory of Solid State Optoelectronic Devicesof Zhejiang Province College of Physics and Electronic Information EngineeringZhejiang Normal UniversityJinhuaZhejiang 321004China Departmentof Physics The Chinese University of Hong KongNew TerritoriesHong Kong 999077China School of Materials Science and Engineering Zhengzhou UniversityZhengzhouHenan 450001China

Ultra-narrow bandgap(ultra-NBG)small molecule acceptors(SMAs)show great potential in organic solar cells(OSCs)due to the extended near-infrared(NIR)*** this work,a synergetic alkoxy side-chain and chlorine-contained end group strategy is employed to achieve A-DA'D-A type ultra-NBG SMAs by introducing alkoxy chains with oxygen atom at the second position into the thiopheneβposition as well as replacing the F atoms with Cl atoms in the end *** a result,the heptacyclic BZO-4F shows a redshifted absorption onset(960 nm)compared with Y11(932 nm)without oxygen atoms in the side ***,the fluorinated end groups are substituted with the chlorinated ones to synthesize *** absorption onset of BZO-4Cl is further redshifted to 990 nm,corresponding to an optical ultra-NBG of 1.25 *** blending with the polymer donor PBDB-T,the binary devices based on PBDB-T:BZO-4F and PBDB-T:BZO-4Cl deliver power conversion efficiencies(PCEs)over 12%.Furthermore,ternary devices with the addition of BZ4F-O-1 into PBDB-T:BZO-4Cl system achieve the optimal PCE of 15.51%.This work proposes a synergetic alkoxy side-chain and chlorine-contained end group strategy to achieve A-DA'D-A type ultra-NBG SMAs,which is important for future molecular design.

关键词： Organic solar cells A-DA'D-A type small molecule acceptors Ultra-narrow bandgap Alkoxy side chains Ternary strategy π-πstacking

A chlorinated non-fullerene acceptor for efficient polymer solar cells

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Chinese Chemical Letters 2019年第12期30卷 2343-2346页

作者： Mei Luo Can Zhu Jun Yuan Liuyang Zhou M.L.Keshtov D.Yu Godovsky yingping zou College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China Nesmeyanov Institute of Organoelement Compounds Russian Academy of SciencesMoscow 119991Russia

Improving the performance and reducing the manufacturing costs are the main directions for the development of organic solar cells in the ***,the strategy that uses chemical structure modification to optimize the photoelectric properties is reported.A new narrow bandgap(1.30 eV)chlorinated non-fullerene electron acceptor(Y15),based on benzo[d][1,2,3] triazole with two 3-undecylthieno[2’,3’:4,5] thieno[3,2-b] pyrrole fused-7-heterocyclic ring,with absorption edge extending to the near-infrared(NIR) region,namely A-DA’D-A type structure,is designed and *** electrochemical and optoelectronic properties are systematically *** from its NIR light harvesting,the fabricated photovoltaic devices based on Y15 deliver a high power conversion efficiency(PCE) of 14.13%,when blending with a wide bandgap polymer donor *** results show that the A-DA’D-A type molecular design and application of near-infrared electron acceptors have the potential to further improve the PCE of polymer solar cells(PSCs).

关键词： Electron acceptor Y15 Chlorinated Non-fullerene electron acceptors Efficient polymer solar cells Narrow bandgap

Ternary organic solar cells:Improved optical and morphological properties allow an enhanced efficiency

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Chinese Chemical Letters 2021年第4期32卷 1359-1362页

作者： Yingying Zhao Liuyang Zhou Xiaobo Wu Xiaosha Wang Yungui Li Yazhou Qi Lihui Jiang Guohui Chen yingping zou College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190China College of Metallurgy and Materials Engineering Hunan University of TechnologyZhuzhou 412000China Max Planck Institute for Polymer Research Ackermannweg 1055128 MainzGermany

The power co nversion efficiency(PCE)of OFQx-T:PC_(71)BM blend films reaches 7.59%.On this basis,ternary organic solar cells(OSCs)were fabricated with ITIC or PTB7-Th as the third *** ternary OSCs with 50 wt%ITIC in acceptors exhibits an enhanced efficiency,from 7.59%to 8.17%.Also,the PCE of ternary OSCs with 50 wt%PTB7-Th in donors achieves 8.72%,which is 13%higher than that of binary *** PCE improvement of two ternary OSCs is mainly due to the increase of short-circuit current density(J_(SC)),which can be attributed to the complementary absorption spectra and improved film *** work suggests that the selection of an appropriate third component plays a critical role in improving the PCE of ternary OSCs.

关键词： Ternary OSCs Broaden absorption spectra Morphology optimization Appropriate third component

A-DA’D-A Type Pentacyclic Small Molecule Acceptors to Exceed 16.5%Efficiency by Heteroatom Effect at the Outer Side Chain

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Chinese Journal of Chemistry 2023年第15期41卷 1815-1822页

作者： Shaofeng Zhu Changzhou Shi Qingya Wei Can Zhu Jie Ren Jianghua Li Lei Meng Yongfang Li Jun Yuan yingping zou State Key Laboratory of Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangshaHunan 410083China Beiing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China. MOE Key Laboratory of Macromolecular Synthesis and Functionalization International Research Center for X PolymersDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhouZhejiang 310027China

Comprehensive Summary In this work,we adopt a“heteroatom side-chains”modification strategy to modify the thiophene units in A-DA'D-A(acceptor-donor-acceptor’-donor-acceptor)type pentacyclic SMAs(small molecule acceptors),that is,introducing branched alkyl chain at theβ-position of thiophene instead of straight alkyl chain,and then introducing oxygen atom at the third-position on the basis of branched *** new pentacyclic SMAs(BZ4F-EH and BZ4F-OEH)were synthesized,and the influence of the heteroatom side-chains on photoelectric properties of A-DA'D-A type pentacyclic SMAs was systematically *** with our previously reported BZ4F(Y26),BZ4F-EH shows slightly blue-shifted absorption,while BZ4F-OEH has obvious red-shifted *** a result,BZ4F-OEH-based binary device achieved a high power conversion efficiency(PCE)of 16.56%with a fill factor(FF)of 79.3%,which is the highest efficiency of pentacyclic SMAs to date.

关键词： Organic solar cells Small molecule acceptors A-DA'D-A type structure Heteroatom side chains Substituent effects

Alkyl side chain engineering enables high performance as-cast organic solar cells of over 17%efficiency

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Fundamental Research 2023年第4期3卷 611-617页

作者： Xiang Xu Yazhou Qi Xiaoyan Luo Xinxin Xia Xinhui Lu Jun Yuan Yonghua Zhou yingping zou State Key Laboratory of Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Department of Physics The Chinese University of Hong KongNew TerritoriesHong Kong 999077China

Achieving high-performance as-cast OSCs is crucial for industrialization in the future,owing to the advantages of better stability,environmental-friendly,and decreasing production *** this regard,we synthesized an ADA′D-A type acceptor,Y6-eC6-BO,by shortening the straight alkyl side-chains on the thiophene position from C_(11) to C_(6) as well as lengthening the branched alkyl side-chains on the pyrrole position of Y6 to achieve a stronger crystallization and better miscibility than *** a result,the corresponding chloroform-processed as-cast PM6:Y6-eC6-BO OSC showed a high PCE of 17.33%,which was one of the highest efficiencies of as-cast *** the as-cast PM6:Y6-eC6-BO OSCs processed from o-xylene displayed a PCE of 16.38%,as far as we know,this is among the highest efficiencies of non-halogenated-solvent processed as-cast *** results demonstrated tailoring the alkyl side-chain of NFAs is a feasible and simple approach to achieve high performance as-cast OSCs and provides guideline in molecular design in the future.

关键词： Organic solar cells Alkyl side chains As-cast Green solvent Stability

New Polymers for Photovoltaics and NIR-II Imaging

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New Polymers for Photovoltaics and NIR-II Imaging