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Organic photovoltaic cell with 17% efficiency and superior processability

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National Science Review 2020年第7期7卷 1239-1246页

作者： Yong Cui Huifeng Yao Ling Hong Tao Zhang Yabing Tang Baojun Lin kaihu xian Bowei Gao Cunbin An Pengqing Bi Wei Ma Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University

The development of organic photoactive materials, especially the newly emerging non-fullerene electron acceptors(NFAs), has enabled rapid progress in organic photovoltaic(OPV) cells in recent *** the power conversion efficiencies(PCEs) of the top-performance OPV cells have surpassed 16%,the devices are usually fabricated via a spin-coating method and are not suitable for large-area ***, we demonstrate that the fine-modification of the flexible side chains of NFAs can yield 17% PCE for OPV cells. More crucially, as the optimal NFA has a suitable solubility and thus a desirable morphology, the high efficiencies of spin-coated devices can be maintained when using scalable blade-coating processing technology. Our results suggest that optimization of the chemical structures of the OPV materials can improve device performance. This has great significance in larger-area production technologies that provide important scientific insights for the commercialization of OPV cells.

关键词： organic photovoltaic cells power conversion efficiency scalable large-area production processability non-fullerene acceptor

Structure-Property Relationship of Conjugated Polymers Utilizing Isomerized Fused Benzothiadiazole-Based Building Blocks

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Chinese Journal of Chemistry 2023年第19期41卷 2525-2530页

作者： Jingyu Liu Wenhao Li kaihu xian Zhongwei Liu Yanru Li xiang Yao Long Ye Yan Zhao Zhuping Fei Institute of Molecular Plus Department of ChemistryTianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin300072 China Haihe Laboratory of Sustainable Chemical Transformations Tianjin300192 China Laboratory of Molecular Materials and Devices Department of Materials ScienceFudan UniversityShanghai200438 China School of Materials Science and Engineering Tianjin UniversityTianjin300072 China

Only a few fused benzothiadizole(BTz)based conjugated polymers have been applied in organic field-effect transistors(OFETs),and their performances were low,mainly due to the lack of available building blocks and in-depth study of the relationship between structure and ***,we report two isomeric fused BTz-based building blocks(M1 and M2)and their copolymers PBTzVBTz-T and PBTzVBTz-TT,PTVT-T and *** study showed all polymers had nearly planar backbone geometries,and PBTzVBTz-TT exhibited the most linear ***-T and PTVT-TT exhibited red-shift absorption spectra and deeper LUMO level than those of PBTzVBTz-T and *** film microstructure study demonstrated PBTzVBTz-TT and PTVT-TT had edge-on molecular orientation,while the others had the mixed molecular orientation of edge-on and ***,PBTzVBTz-TT had the longest coherence length in thin *** these features of PBTzVBTz-TT resulted in its highest carrier mobility of 0.1 cm^(2)·V^(–1)·s^(–1) among these polymers.

关键词： Conjugated polymers Organic field-effect transistors Benzothiadiazole Isomerization Fused-ring systems

Efficient Small-Molecule Organic Solar Cells by Modulating Fluorine Substitution Position of Donor Material

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Chinese Journal of Chemistry 2023年第7期41卷 755-762页

作者： Tao Zhang Qianglong Lv Zhongxiang Peng Cunbin An Pengqing Bi Ye Xu Ni Yang Jingwen Wang kaihu xian Long Ye Shaoqing Zhang Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular SciencesCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190 China University of Chinese Academy of Sciences Beijing100049 China School of Materials Science&Engineering Tianjin Key Laboratory of Molecular Optoelectronic SciencesTianjin Universityand Collaborative Innovation Center of Chemical Science and EngineeringTianjin300350 China Beijing Key Laboratory for Optical Materials and Photonic Devices Department of ChemistryCapital Normal UniversityBeijing100048 China

Comprehensive Summary The fluorine substitution position in organic semiconductors is critical in improving device performance for organic solar cells(OSCs).Herein,two similar small-molecule donors,B3T-PoF and B3T-PmF,are designed and synthesized,which only differ on the fluorine substitution position on the pendent benzene *** both small-molecule donors exhibit similar absorption profiles and molecular energy levels,B3T-PmF has stronger crystallinity and lower energetic disorder than *** blending with the non-fullerene acceptor of BO-4Cl,B3T-PmF shows better phase separation and more ordered molecular packing in blend *** a result,the B3T-PoF:BO-4Cl-based OSC shows a power conversion efficiency(PCE)of 12.3%.In contrast,the B3T-PmF:BO-4Cl-based cell demonstrates obviously increased JSC and FF values,thus yielding an excellent PCE of 14.7%.This study indicates that reasonable selection of fluorine atom substitution position in conjugated side chains is one of the promising strategies for achieving high-performance SM-DSCs.

关键词： Organic solar cell Small-molecule donor Fluorine substitution Morphology Miscibility

Simultaneous Optimization of Efficiency,Stretchability,and Stability in All-Polymer Solar Cells via Aggregation Control

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Chinese Journal of Chemistry 2023年第2期41卷 159-166页

作者： kaihu xian Kangkang Zhou Mingfei Li Junwei Liu Yaowen Zhang Tao Zhang Yong Cui Wenchao Zhao Chunming Yang Jianhui Hou Yanhou Geng Long Ye School of Materials Science&Engineering Tianjin Key Laboratory of Molecular Optoelectronic SciencesTianjin Universityand Collaborative Innovation Center of Chemical Science and EngineeringTianjin 300350China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Beijing National Laboratory for Molecular Sciences State Key Laboratory of Polymer Physics and ChemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China College of Materials Science and Engineering Nanjing Forestry UniversityNanjingJiangsu 210037China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhouFujian 350207China

With the emergence of Y-series small molecule acceptors,polymerizing the small molecule acceptors with aromatic linker units has attracted significant research attention,which has greatly advanced the photovoltaic performance of all-polymer solar *** the rapid increase in efficiency,the unique characteristics(e.g.,mechanical stretchability and flexibility)of all-polymer systems were still not thoroughly *** this work,we demonstrate an effective approach to simultaneously improve device performance,stability,and mechanical robustness of all-polymer solar cells by properly suppressing the aggregation and crystallization behaviors of polymerized Y-series ***,when introducing 50 wt%PYF-IT(a fluorinated version of PY-IT)into the well-known PM6:PY-IT system,the all-polymer devices delivered an impressive photovoltaic efficiency of 16.6%,significantly higher than that of the control binary cell(15.0%).Compared with the two binary systems,the optimal ternary blend exhibits more efficient charge separation and balanced charge transport accompanying with less ***,a high-performance 1.0 cm^(2)large-area device of 15%efficiency was demonstrated for the optimized ternary all-polymer blend,which offered a desirable PCE of 14.5%on flexible substrates and improved mechanical flexibility after bending 1000 ***,these are among the best results for 1.0 cm^(2)all-polymer OPVs thus *** work also heralds a bright future of all-polymer systems for flexible wearable energy-harvesting applications.

关键词： Organic photovoltaics Polymer acceptors Aggregation Stretchability Stability

Refining acceptor aggregation in nonfullerene organic solar cells to achieve high efficiency and superior thermal stability

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Science China Chemistry 2023年第1期66卷 202-215页

作者： kaihu xian Shengnan Zhang Ye Xu Junwei Liu Kangkang Zhou Zhongxiang Peng Mingfei Li Wenchao Zhao Yu Chen Zhuping Fei Jianhui Hou Yanhou Geng Long Ye School of Materials Science&Engineering Tianjin Key Laboratory of Molecular Optoelectronic SciencesTianjin Universityand Collaborative Innovation Center of Chemical Science and EngineeringTianjin 300350China Institute of Molecular Plus Tianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Beijing National Laboratory for Molecular Sciences State Key Laboratory of Polymer Physics and ChemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China Institute of High Energy Physics Chinese Academy of SciencesBejing 100049China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New Cityuzhou 350207China

With the rapid increase in photoelectric conversion efficiency of organic photovoltaics(OPVs),prolonging the operational lifetime of devices becomes one of the critical prerequisites for commercial *** by the theoretical calculations of molecular stacking and miscibility,we proposed an effective approach to simultaneously improve device performance and thermal stability of high-efficiency OPVs by refining the aggregation of Y-series *** key to this approach is deliberately designing an asymmetric Y-series acceptor,named Y6-CNO,which acts as a third component regulator to finely tune the degree of acceptor aggregation and crystallization in the benchmark PM6:Y6-BO ***,a champion photovoltaic efficiency of 18.0%was achieved by introducing 15 wt%Y6-CNO into the PM6:Y6-BO system,significantly higher than the control binary cell(16.7%).Moreover,annealing at 100°C for over 1,200 h does not markedly affect the photovoltaic performance of the optimal ternary devices,maintaining above 95%of the initial performance and exhibiting an exceptionally high T_(80)lifetime of 9,000 h under continuous thermal *** contrast,binary devices suffer from excessive crystallization of acceptors with long-term ***,mixing thermodynamics combined with morphological characterizations were employed to elucidate the microstructure-thermal stability *** ternary OPVs consisting of symmetric and asymmetric homologous acceptors form better charge transport channels and can effectively suppress excessive aggregation of acceptors under long-term *** work demonstrates the effectiveness of refining acceptor aggregation via molecular design for highly efficient and stable nonfullerene-based OPVs.

关键词： organic photovoltaics asymmetric acceptor miscibility aggregation thermal stability

Thermally stable poly(3-hexylthiophene):Nonfullerene solar cells with efficiency breaking 10%

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Aggregate

Aggregate 2022年第5期3卷 205-216页

作者： Mengyuan Gao Yang Liu kaihu xian Zhongxiang Peng Kangkang Zhou Junwei Liu Saimeng Li Fei Xie Wenchao Zhao Jidong Zhang Xuechen Jiao Long Ye School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic SciencesTianjin UniversityTianjinChina National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefeiChina Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjingChina State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunChina

Solar cells featuring polythiophenes as donors are one of the optoelectronic devices that hold notable promises for commercial application,profiting from the lowest synthetic complexity and excellent ***,the complex phase behaviors of polythiophenes and their blends put constraints on modulating electrical performance and thus realizing stable performance under thermal *** this contribution,we present a multi-technique approach that combines calorimetry,scattering,spectroscopy,and microscopy to thoroughly probe the thermodynamic mixing,thermal properties of materials,the evolution of nanoscale domain structure,and device performance of poly(3-hexylthiophene)(P3HT)with a range of nonfullerene acceptors(NFAs)such as ITIC,IDTBR,and ***,two blending guidelines are established for matching these popular NFAs with P3HT to enable highly efficient and thermally stable ***,blend systems with weak vitrification and hypo-miscibility are excellent candidates for efficient solar ***,high thermal stability can be achieved by selecting NFAs with diffusion-limited *** P3HT:ZY-4Cl blend was found to endow the best performance of over 10%efficiency and an exceptionally high T_(80) lifetime of>6000 h under continuous thermal annealing,which are among the highest values for P3HT-based solar *** realization of high thermal stability and efficiency demonstrates the remarkable potentials of simple polythiophene:nonfullerene pairs in electronic applications.

关键词： multi-technique approach organic solar cells phase separation polythiophene thermal stability

Delicate Crystallinity Control Enables High-Efficiency P3HT Organic Photovoltaic Cells

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Delicate Crystallinity Control Enables High-Efficiency P3HT ...

Miscibility screening promotes the efficiency and stability of P3HT-based organic solar cells Special Issue:Emerging Investigators

第九届新型太阳能材料科学与技术学术研讨会

作者： kaihu xian Jianhui Hou Yanhou Geng Long Ye School of Materials Science and Engineering Tianjin University Institute of Chemistry Chinese Academy of Sciences

As a benchmark semiconducting polymer, poly(3-hexyl-thiophene)(P3 HT) has been broadly used to construct a wide range of organic electronic devices. In comparison with P3 HT:fullerene systems, the blends of P3 HT with emerging nonfullerene acceptors remain significantly less explored and the structure-performance relationships also lack in-depth guides. In this work, time-dependent grazing incidence X-ray scattering and real-space microscopy experiments were carried out to monitor the microstructure change of the high-efficiency blend of P3 HT and a Y6-type nonfullerene acceptor1(i.e., ZY-4 Cl) over the duration of thermal annealing. By precisely manipulating the crystalline order of both donor and acceptor, we found that simply shortening the annealing time can endow a remarkable 19-fold increase in the solar cell efficiency. We observed profound changes of the whole photovoltaic parameters(open-circuit voltage, current density, fill factor, and power conversion efficiency) within the first 1 minute, while a slight variation emerged in the later stage. Attractively, the P3 HT:ZY-4 Cl blend film subject to thermally annealing for merely 30 seconds gave rise to a remarkable power conversion efficiency of 10.71%2, which is the very best efficiency of P3 HTbased organic photovoltaic cells at present. The research shed light on the morphological optimization and cost-effective processing of polythiophene:nonfullerene blends for optoelectronic applications.

关键词： organic solar cells P3HT nonfullerene acceptor crystallization phase separation

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Aggregate

Aggregate 2024年第2期5卷 414-422页

作者： kaihu xian Ruijie Ma Kangkang Zhou Junwei Liu Mengyuan Gao Wenchao Zhao Miaomiao Li Yanhou Geng Long Ye School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic SciencesCollaborative Innovation Center of Chemical Science and EngineeringTianjin UniversityTianjinChina Department of Electronic and Information Engineering Research Institute for Smart Energy(RISE)Guangdong-Hong Kong-Macao(GHM)Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and DevicesThe Hong Kong Polytechnic UniversityKowloonChina Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjingChina Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhouChina Hubei Longzhong Laboratory XiangyangChina

The power conversion efficiency of organic photovoltaics(OPVs)has witnessed continuous breakthroughs in the past few years,mostly benefiting from the extensive use of a facile ternary blending strategy by blending the host polymer donor:small molecule acceptor mixture with a second small molecule ***,this rather general strategy used in the well-known PM6 systems fails in constructing high-performance P3HT-based ternary *** a result,the efficiencies of all resulting ternary blends based on a benchmark host P3HT:ZY-4Cl and a second acceptor are no more than 8%.Employing the mutual miscibility of the binary blends as a guide to screen the second acceptor,here we were able to break the longstanding 10%-efficiency barrier of ternary OPVs based on P3HT and dual nonfullerene *** this rational approach,we identified a multifunctional small molecule acceptor BTP-2Br to simultaneously improve the photovoltaic performance in both P3HT and PM6-based ternary ***,the P3HT:ZY-4Cl:BTP-2Br ternary blend exhibited a record-breaking efficiency of 11.41%for P3HT-based *** is the first-ever report that over 11%efficiency is achieved for P3HTbased ternary ***,the study helps the community to rely less on trial-and-error methods for constructing ternary solar cells.

关键词： crystallization miscibility organic photovoltaics phase separation polythiophene

15.3% efficiency all-small-molecule organic solar cells enabled by symmetric phenyl substitution

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Science China Materials 2020年第7期63卷 1142-1150页

作者： Jinzhao Qin Cunbin An Jianqi Zhang Kangqiao Ma Yang Yang Tao Zhang Sunsun Li kaihu xian Yong Cui Yabing Tang Wei Ma Huifeng Yao Shaoqing Zhang Bowei Xu Chang He Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and TechnologyBeijing 100190China School of Chemistry and Biology Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China

Synergistic optimization of donor-acceptor blend morphologyis a hurdle in the path of realizing efficient non-fullerene small-molecule organic solar cells(NFSMOSCs)due to the anisotropic conjugated backbones of both donor and ***,developing a facile molecular design strategy to effectively regulate the crystalline properties of photoactive materials,and thus,enable the optimization of blend morphology is of vital *** this study,a new donor molecule B1,comprising phenyl-substituted benzodithiophene(BDT)central unit,exhibits strong interaction with the non-fullerene acceptor BO-4 Cl in comparison with its corresponding thiophene-substituted BDT-based material,*** a result,the B1 is affected and induced from an edgeon to a face-on orientation by the acceptor,while the BTR and the acceptor behave individually for the similar molecular orientation in pristine and blend films according to grazing incidence wide angle X-ray scattering *** means the donor-acceptor blend morphology is synergistically optimized in the B1 system,and the B1:BO-4 Cl-based devices achieve an outstanding power conversion efficiency(PCE)of 15.3%,further certified to be 15.1%by the National Institute of Metrology,*** results demonstrate a simple and effective strategy to improve the crystalline properties of the donor molecule as well as synergistically optimize the morphology of the all-small-molecule system,leading to the high-performance NFSM-OSCs.

关键词： organic solar cells all-small-molecule non-fullerene crystallinity intermolecular interaction