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Non-fullerene acceptors with a Thieno[3,4-c]pyrrole-4,6-dione(TPD) Core for Efficient Organic Solar Cells

Chinese Journal of Polymer Science 2019年第10期37卷 1005-1014,I0005页

作者： Shi-Zhe Geng Wei-Tao Yang Jian Gao Shui-Xing Li Min-Min Shi Tsz-Ki Lau Xin-Hui Lu Chang-Zhi Li Hong-Zheng Chen Key Laboratory of Macromolecular Synthesis and Functionalization(Ministry of Education) State Key Laboratory of Silicon MaterialsDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Department of Physics The Chinese University of Hong KongNew TerritoriesHong KongChina

To achieve the red-shifted absorptions and appropriate energy levels of A-D-A type non-fullerene acceptors(NFAs), in this work, we design and synthesize two new NFAs, named TPDCIC and TPDCNC, whose electron-donating(D) unit is constructed by a thieno[3,4-c]pyrrole-4,6-dione(TPD) core attached to two cyclopentadithiophene(CPDT) moieties at both sides, and the electronaccepting(A) end-groups are 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile(IC) and 2-(3-oxo-2,3-dihydro-1 H-cyclopenta[b]naphthalen-1-ylidene)malononitrile(NC), respectively. Benefiting from TPD core, which easily forms quinoid structure and O···H or O···S intramolecular noncovalent interactions, TPDCIC and TPDCNC show more delocalization of π-electrons and perfect planar molecular geometries, giving the absorption ranges extended to 822 and 852 nm, respectively. Furthermore, the highest occupied molecular orbital(HOMO) levels of TPDCIC and TPDCNC remain relatively low-lying due to the electronegativity of the carbonyl groups on TPD core. Considering that the absorptions and energy levels of the two NFAs match well with those of a widely used polymer donor, PBDB-T, we fabricate two kinds of organic solar cells(OSCs) based on the PBDB-T:TPDCIC and PBDB-T:TPDCNC blended films, respectively. Through a series of optimizations, the TPDCIC-based devices yield an impressing power conversion efficiency(PCE)of 10.12% with a large short-circuit current density(JSC) of 18.16 mA·cm-2, and the TPDCNC-based ones exhibit a comparable PCE of9.80% with a JSC of 17.40 mA·cm-2. Our work is the first report of the TPD-core-based A-D-A type NFAs, providing a good reference for the molecular design of high-performance NFAs.

关键词： Non-fullerene acceptors (NFAs) Organic solar cells (OSCs) Thieno[3,4-c]pyrrole-4,6-dione (TPD) Narrow bandgap Energy levels

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Rhodanine-based nonfullerene acceptors for organic solar cells

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Science China Materials 2019年第11期62卷 1574-1596页

作者： Hongtao Liu Zhong’an Li Dongbing Zhao Key Laboratory for Material Chemistry of Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory and Institute of Elemento-Organic Chemistry College of ChemistryNankai UniversityTianjin 300071China

Significant progress on the development of nonfullerene acceptors(NFAs)for organic solar cells(OSCs)has been made in the past several years,and the power conversion efficiency(PCE)exceeding 17%has been already realized based on a tandem non-fullerene *** date,NFAs with a linearly fused acceptor-donor-acceptor(A-D-A)structure are of great interest,due to their attracting synthetic flexibility and high photovoltaic *** is one of the most studied electron-withdrawing moieties to construct such A-D-A type NFAs,and the resulting single-junction OSCs have produced PCEs of^10%.More interestingly,those rhodanine-based NFAs have demonstrated a particularly excellent compatibility with well-known P3HT donor,enabling respectable PCEs over 7%.Thus in this review,we summarize the important advances on rhodanine-based NFAs with a main focus on discussing the molecular design strategies,providing a better understanding of the structure-property relationship for those rhodanine-based NFAs.

关键词： organic solar cells non-fullerene acceptors rhodanine

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Perylene Diimide Based Isomeric Conjugated Polymers as Efficient Electron acceptors for All-polymer Solar Cells

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Chinese Journal of Polymer Science 2019年第1期37卷 18-27,1-5页

作者： Xiao-Cheng Liu Qing-Wu Yin Zhi-Cheng Hu Zhen-Feng Wang Fei Huang Yong Cao State Key Laboratory of Luminescent Materials and Devices School of Materials Science and Engineering South China University of Technology South China Institute of Collaborative Innovation

We present here a series of perylene diimide(PDI)based isomeric conjugated polymers for the application as efficient electron acceptors in all-polymer solar cells(all-PSCs).By copolymerizing PDI monomers with 1,4-diethynylbenzene(para-linkage)and 1,3-diethynylbenzene(meta-linkage),isomeric PDI based conjugated polymers with parallel and non-parallel PDI units inside backbones were *** was found that para-linked conjugated polymer(PA)showed better solubility,strongerπ-πstacking,more favorable blend morphology,and better photovoltaic performance than those of meta-linked conjugated polymers(PM)*** based on PTB7-Th:PA(PTB7-Th:poly{4,8-bis[5-(2-ethylhexyl)-thiophen-2-yl]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)-carbonyl]thieno[3,4-b]thiophene-4,6-diyl})showed significantly enhanced photovoltaic performance than that of PTB7-Th:MA(3.29%versus 0.92%).Moreover,the photovoltaic performance of these polymeric acceptors could be further improved via a terpolymeric *** copolymerizing a small amount of meta-linkages into PA,the optimized terpolymeric acceptors enabled to enhance photovoltaic performance with improved the short-circuit current density(Jsc)and fill factor(FF),resulting in an improved power conversion efficiency(PCE)of 4.03%.

关键词： Isomeric conjugated polymers All-polymer solar cells Electron acceptors Perylene diimide

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Simple non-fullerene electron acceptors with unfused core for organic solar cells

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Chinese Chemical Letters 2019年第1期30卷 222-224页

作者： Yao Li Yunhua Xu Fan Yang Xudong Jiang Cheng Li Shengyong You Weiwei Li Department of Chemistry School of Science Beijing Jiaotong University Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Institute of Applied Chemistry Jiangxi Academy of Sciences

Two simple electron acceptors based on unfused bithiophene core and 1,1-dicyanomethylene-3-indanone end group were easily prepared via three synthetic steps. These acceptors exhibited broad absorption in the range of 300 nm to 800 nm, aligned energy levels and high crystallinity. When combined with a wide band gap donor polymer in non-fullerene solar cells, an initial power conversion efficiency of 2.4% was achieved. The relatively low efficiencies were due to the large phase separation in blended thin films, which is originated from their high aggregation tendency in thin films. Our results suggest that these electron acceptors with unfused core are promising candidates for commercial application of solar cells due to the low cost starting materials and facile synthesis.

关键词： Organic solar cells Non-fullerene electron acceptors Unfused core High crystallinity Low cost materials

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Nonfullerene acceptors based on perylene monoimides

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Journal of Semiconductors 2022年第5期43卷 10-12页

作者： Yutong Ji Helong Bai Lixiu Zhang Youdi Zhang Liming Ding College of Chemistry Changchun Normal UniversityChangchun 130032China Key Laboratory of Advanced Green Functional Materials Changchun Normal UniversityChangchun 130032China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Nonfullerene organic solar cells(NF-OSCs) have become a research hotspot, and the device efficiency has been constantly updated[1-14]. The efficiency of binary and ternary solar cells has exceeded 18%[15-17] and 19%[18], respectively. In the early study of OSCs, the development of organic acceptors lagged behind that of organic donors.

关键词： ternary fullerene acceptors

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Polymer acceptors for all-polymer solar cells

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Journal of Semiconductors 2021年第8期42卷 4-7页

作者： Xiaofei Ji Zuo Xiao Huiliang Sun Xugang Guo Liming Ding Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Bulk-heterojunction polymer solar cells(PSCs)as a clean and renewable energy resource have attracted great attention from both academia and industry[1−20].Recently non-fullerene PSCs based on polymer donors(PDs)and small molecule acceptors(SMAs)have achieved remarkable success with the power conversion efficiencies(PCEs)over 18%[21−26].

关键词： polymer acceptors heterojunction

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Profile of Implanon~ acceptors and pattern of side effects

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Journal of Reproduction and Contraception 2015年第1期26卷 46-52页

作者： Adebola O.Roberts Imran O.Morhason-Bello Michael A.Okunlola Adeyemi O.Adekunle Department of Obstetrics and Gynaecology Faculty of Clinical Sciences College of Medicine/University College Hospital University of Ibadan

Objective To determine the social and biological characteristics of Implanon acceptors at Ibadan Nigeria, and also to describe reasons why they opt for this choice and their concerns. Methods This was a descriptive study that retrospectively reviewed all records of the Implanon acceptors from January 2006 to December 2009 at University College Hospital Ibadan, Nigeria. Results One hundred and twenty-eight women accepted Implanon as a modern contraception accounting 4.3% of the total number of clients seen （2 972） during the period. The age range of the client that accepted Implanon was 26-43 years with a mean of 33.6 ±2.4 years. Of the 128 Implanon acceptors, 101 （78.9%） had used other contraceptive methods before. The commonest reason for switching to Implanon by clients was failure of the contraceptive method that was previously used （32.7%）. Within the first year follow-up of insertion, none of the Implanon acceptors had expressed desire for removal due to any of the side effects, and none contraceptive failure was observed during their follow-up evaluation. Conclusion The findings suggest that Implanon could safely be used by all women of reproductive age group including those who desire future fertility.

关键词： implanon contraceptive methods hormonal contraception women acceptors Nigeria

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Organic photodetectors with non-fullerene acceptors

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Journal of Semiconductors 2022年第11期43卷 1-4页

作者： Songxue Bai Lixiu Zhang Qianqian Lin Liming Ding Key Lab of Artificial Micro-and Nano-Structures(MoE) School of Physics and TechnologyWuhan UniversityWuhan 430072China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China Hubei Luojia Laboratory Wuhan 430072China Suzhou Institute of Wuhan University Suzhou 255123China

During last decade,organic photovoltaics experienced an exciting renaissance[1-5],mainly benefiting from the development of non-fullerene acceptors(NFAs),which boosted the power conversion efficiency to-20%[6,7].Along with the unprecedented success of organic solar cells,non-fullerene acceptors also find other optoelectronic *** particular,high-performance organic photodetectors(OPDs)[8,9]based on non-fullerene acceptors have been reported.

关键词： fullerene acceptors boost

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High Open-circuit Voltage and Low Voltage Loss in All-polymer Solar Cell with a Poly(coronenediimide-vinylene)Acceptor

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Chinese Journal of Polymer Science 2020年第11期38卷 1157-1163,I0005页

作者： Han Han Fu-Jin Bai Rong Wei Han Yu Yi-Kun Guo He Yan Da-Hui Zhao Beijing National Laboratory for Molecular Sciences Centre for the Soft Matter Science and EngineeringThe Key Laboratory of Polymer Chemistry and Physics of the Ministry of EducationCollege of ChemistryPeking UniversityBeijing 100871China Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration&Reconstruction Hong Kong University of Science and Technology(HKUST)Clear Water BayKowloonHong Kong 999077China

Reducing the voltage loss(Vloss)is a critical factor in optimizing the open-circuit voltage(Voc)and overall power-c on version efficie ncy(PCE)of polymer solar *** the current work,by designing a novel electron-accepting unit of coronenediimide(CDI)and using it as the main functional building block,a new polymer acceptor CDI-V is developed and applied to fabricate all-polymer solar *** with the perylenediimide-based polymer acceptors we previously reported,the current CDI-V polymer possesses a noticeably elevated lowest unoccupied molecular orbital(LUMO).Thereby,by virtue of the enlarged energy gap between the donor HOMO and acceptor LUMO,a high Voc value of 1.05 V is achieved by the all-polymer photovolatic device,along with an impressively low Vloss of 0.55 *** remarkably,in spite of an extremely small LUMO level offset of 0.01 eV exhibited by the donor and acceptor polymers,effective charge separation still takes place in the allpolymer device,as evidenced by a proper short-circuit current(Jsc)of 9.5 mA·cm^-2 and a decent PCE of 4.63%.

关键词： All-polymer solar cell Coronenediimide Voltage loss acceptors

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Regulating the morphology of fluorinated non-fullerene acceptor and polymer donor via binary solvent mixture for high efficiency polymer solar cells

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Science China Chemistry 2019年第9期62卷 1221-1229页

作者： Mengxue Chen Zhuohan Zhang Wei Li Jinlong Cai Jiangsheng Yu Emma L. K. Spooner Rachel C. Kilbride Donghui Li Baocai Du Robert S. Gurney Dan Liu Weihua Tang David G. Lidzey Tao Wang School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan 430070 China School of Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 China Department of Physics and Astronomy University of Sheffield Sheffield S3 7RH UK

Fluorinated non-fullerene acceptors(NFAs) usually have planar backbone and a higher tendency to crystallize compared to their non-fluorinated counterparts, which leads to enhanced charge mobility in organic solar cells(OSCs). However, this selforganization behavior may result in excessive phase separation with electron donors and thereby deteriorate device ***, we demonstrate an effective approach to tune the molecular organization of a fluorinated NFA(INPIC-4 F), and its phase separation with the donor PBDB-T, by varying the casting solvent. A prolonged film drying time encourages the crystallization of INPIC-4 F into spherulites and consequently results in excessive phase separation, leading to a low device power conversion efficiency(PCE) of 8.1%. Contrarily, a drying time leads to fine mixed domains with inefficient charge transport properties,resulting in a moderate device PCE of 11.4%. An intermediate film drying time results in the formation of face-on π-π stacked PBDB-T and INPIC-4 F domains with continuous phase-separated networks, which facilitates light absorption, exciton dissociation as well as balanced charge transport towards the electrode, and achieves a remarkable PCE of 13.1%. This work provides a rational guide for optimizing the molecular ordering of NFAs and electron donors for high device efficiency.

关键词： organic solar cells non-fullerene acceptors solvent morphology efficiency

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