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Polymer donors with hydrophilic side-chains enabling efficient and thermally-stable polymer solar cells by non-halogenated solvent processing

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Nano Research Energy 2024年第1期3卷 19-29页

作者： Soodeok Seo Jun-Young Park Jin Su Park Seungjin Lee Do-Yeong Choi Yun-Hi kim bumjoon J.kim Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Materials Engineering and Convergence Technology and ERI Gyeongsang National UniversityJinju 52828Republic of Korea Advanced Energy Materials Research Center Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Republic of Korea Department of Chemistry and ERI Gyeongsang National UniversityJinju 52828Republic of Korea

Polymer solar cells(PSCs)with high power conversion efficiency(PCE)and environment-friendly fabrication are the main requirements enabling their production in industrial *** the use of non-halogenated solvent processing is inevitable for the PSC fabrication,it significantly reduces the processability of polymer donors(PDS)and small-molecule acceptors(SMAs).This often results in unoptimized blend morphology and limits the device *** address this issue,hydrophilic oligoethylene glycol(OEG)side-chains are introduced into a PD(2EG)to enhance the molecular compatibility between the PD and L8-BO *** 2EG PD induces higher crystallinity and alleviates phase separation with the SMA compared to the reference PD(PM7)with hydrocarbon ***,the 2EG-based PSCs exhibit a higher PCE(15.8%)than the PM7-based PSCs(PCE=14.4%)in the ortho-xylene based ***,benefitted from the reduced phase separation and increased crystallinity of 2EG PDS,the 2EG-based PSCs show enhanced thermal stability(84%of initial PCE after 120 h heating)compared to that of the PM7-based PSCs(60%of initial PCE after 120 h heating).This study demonstrates the potential of OEG side-chain-incorporated materials in developing efficient,stable,and eco-friendly PSCs.

关键词： polymer solar cell polymer donor OEG side-chain non-halogenated solvent process side-chain engineering

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LOCAL CREEP EVALUATION OF P92 STEEL WELDMENT BY SMALL PUNCH CREEP TEST

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Acta Mechanica Solida Sinica 2008年第4期21卷 312-317页

作者： bumjoon kim Byeongsoo Lim School of Mechanical Engineering Sungkyunkwan UniversitySuwon 440-746Korea

The aim of this research is to evaluate the local creep damage of various microstructures such as coarse grained heat affected zone （CGHAZ）, fine grained heat affected zone （FG- HAZ）, intercritical heat affected zone （ICHAZ） known as Type IV region, weld metal, and base metal of P92（9Cr-2W） steel weldment by small punch （SP） creep test at 600~ C. Also, to determine the weakest local part of the weldment, the effect of microstructures on creep rupture behavior in the weldment of P92 steel was studied. From the experimental results, the FGHAZ and Type IV region turned out to be very weak local parts of P92 weldment. Especially, the TYPE IV region showed the greatest displacement rate and had the shortest rupture life with many creep cavities widely spreaded in most of the region.

关键词： conventional creep small punch creep heat affected zone cavity

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Polymersome formation by solvent annealing-induced structural reengineering under 3D soft confinement

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Nano Research 2021年第12期14卷 4644-4649页

作者： Xi Mao Hao Li Jinwoo kim Shuai Deng Renhua Deng bumjoon J.kim Jintao Zhu Key Laboratory of Material Chemistry for Energy Conversion and Storage of Ministry of Education(HUST) and State Key Laboratory of Materials Processing and Die&Mold TechnologySchool of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)Wuhan430074China Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea

A solvent annealing-induced structural reengineering approach is exploited to fabricate polymersomes from block copolymers that are hard to form vesicles through the traditional solution self-assembly *** specifically,polystyrene-b-poly(4-vinyl pyridine)(PS-b-P4VP)particles with sphere-within-sphere structure(SS particles)are prepared by three-dimensional(3D)soft-confined assembly through emulsion-solvent evaporation,followed by 3D soft-confined solvent annealing upon the SS particles in aqueous dispersions for structural engineering.A water-miscible solvent(e.g.,THF)is employed for annealing,which results in dramatic transitions of the assemblies,e.g.,from SS particles to *** approach works for PS-b-P4VP in a wide range of block ***,this method enables effective encapsulation/loading of cargoes such as fluorescent dyes and metal nanoparticles,which offers a new route to prepare polymersomes that could be applied for cargo release,diagnostic imaging,and nanoreactor,etc.

关键词： polymersome block copolymer three-dimensional(3D)confinement self-assembly solvent annealing

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Aqueous-processable,naphthalene diimide-based polymers for eco-friendly fabrication of high-performance,n-type organic electrolyte-gated transistors

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Science China Chemistry 2022年第5期65卷 973-978页

作者： Dahyun Jeong Min Je kim Seungjin Lee Jin-Woo Lee Youngwoong kim Hyeong Jun kim Jeong Ho Cho bumjoon J.kim Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Chemical and Biomolecular Engineering Sogang UniversitySeoul 04107Republic of Korea

Organic electrolyte-gated transistors(OEGTs) have the benefits of low power consumption and large current ***,the electrical performance of n-type OEGTs lags far behind that of p-type *** this study,we design a series of polymers,P(NDITEG-T) and P(NDIMTEG-T),comprising a naphthalene diimide backbone for n-type charge transport and oligo(ethylene glycol)(OEG) side chains for high ionic conductivity and eco-friendly solution *** incorporation of the OEG chain facilitates the electrochemical doping of the semiconductor by ions to realize high-performance,n-type ***,in OEGTs,P(NDITEG-T) achieves a high electron mobility of 1.0 × 10^(-1) cm^(2) V^(-1) s^(-1),which represents the highest value reported for solution-processed,n-type *** is noted that the fabrication of the OEGTs is achieved by solution processing with eco-friendly ethanol/water mixtures in virtue of the hydrophilic OEG *** work demonstrates the molecular design of the P(NDITEG-T) polymer and its significant ability to produce aqueous-processable,high-performance,and n-type OEGTs.

关键词： organic electrolyte-gated transistors n-type transistors oligo(ethylene glycol)polymers eco-friendly solution process high electron mobility

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A High Dielectric N-Type Small Molecular Acceptor Containing Oligoethyleneglycol Side-Chains for Organic Solar Cellst

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Chinese Journal of Chemistry 2018年第3期36卷 199-205页

作者： Bomee Jang Changyeon Lee Young Woong Lee Donguk kim Mohammad Afsar Uddin Felix Sunjoo kim bumjoon J. kim Han Young Woo Department of Chemistry Korea University Seoul 02841 Republic of Korea Department of Chemical and Biornolecular Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea School of Chemical Engineering and Materials Science Chung-Ang UniversitySeoul 06974 Republic of Korea

We report a new small molecular acceptor, ITIC-OEG, which is based on indacenodithieno[3,2-b]thiophene and 1,1-（dicyanomethylene）-3- indanone including oligoethyleneglycol （OEG） side-chains. ITIC-OEG was found to have higher dielectric constant （ε1=5.6} than that of a reference molecule of ITIC with normal alkyl substituents （ε1=3.9）. The dielectric constant of medium influences significantly the exciton binding energy and the resulting charge separation and recombination. The optical, electrochemical and morphological properties of ITIC-OEG and its photovoltaic characteristics were investigated by blending with a semi-crystalline donor polymer, PPDT2FBT, with comparison to those of ITIC. ITIC-OEG shows more red-shifted absorption and stronger crystalline packing than ITIC. However, the lower photovoltaic performance （with 1.58% power conversion efficiency, PCE） was measured for PPDT2FBT-ITIC-OEG, compared to PPDT2FBT：ITIC （5..52% PCE）. The incompatibility between PPDT2FBT and ITIC-OEG （due to high hydrophilic nature of OEG chains） resulted in poor intermixing with large domain separation over 300 nm, showing inefficient charge separation and significant charge recombination. Therefore, to investigate the effect of dielectric constant of the materials on the charge separation and recombination, the blend morphology of the PPDT2FBT：ITIC-OEG should be optimized first by improving their miscibility and phase separation.

关键词： N-type small molecule dielectric constant morphology organic solar cells

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Revisiting the Bithiophene Imide-Based Polymer Donors: Molecular Aggregation and Orientation Control Enabling New Polymer Donors for High-Performance All-Polymer Solar Cells

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Chinese Journal of Chemistry 2022年第24期40卷 2900-2908,I0002页

作者： Jie Yang Bin Liu Jin-Woo Lee Yimei Wang Huiliang Sun Zhicai Chen Qingqing Bai bumjoon J.kim Yan Jiang Li Niu Xugang Guo Department of Materials Science and Engineering Southern University of Science and Technology(SUSTech)No.1088Xueyuan RoadShenzhenGuangdong518055 China Center for Advanced Analytical Science School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhouGuangdong510006 China Energy Materials and Optoelectronics Unit Songshan Lake Materials LaboratoryDongguanGuangdong523808 China Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon34141 Republic of Korea

Bithiophene imide (BTI)-based polymers have been promising photovoltaic materials due to their high mobility and tunable energy levels. However, BTI polymers have rarely been revisited since organic solar cells (OSCs) entered the era of non-fullerene electron acceptors (NFEA) likely owing to their incompatibility with NFEAs. Herein, fine-tuning the aggregation and orientation of BTI-based donor-π-acceptor (D-π-A) polymer donors was achieved by incorporating the linear n-octyl group into thiophene π-bridge. The resulting polymer donor G15 shows excellent compatibility with NFEA L15 (polymer acceptor). The G15-based all-polymer OSCs achieve high power conversion efficiency of 15.17%. This is significantly higher than that (< 5%) of its analogue with isomerized branched alkyl chains and also among the highest values for all-polymer OSCs. The results highlight that well-tailored BTI polymer donors are attractive photovoltaic materials for further exploration in non-fullerene organic solar cells.

关键词： Bithiophene imide Molecular orientation Isomerization Polymer donors All-polymer solar cells

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Effects of Flexible Conjugation-Break Spacers of Non-Conjugated Polymer Acceptors on Photovoltaic and Mechanical Properties of All-Polymer Solar Cells

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Nano-Micro Letters 2022年第10期14卷 164-177页

作者： Qiaonan Chen Yung Hee Han Leandro R.Franco Cleber F.N.Marchiori Zewdneh Genene CMoyses Araujo Jin-Woo Lee Tan Ngoc-Lan Phan Jingnan Wu Donghong Yu Dong Jun kim Taek-Soo kim Lintao Hou bumjoon J.kim Ergang Wang Siyuan Laboratory Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhou 510632People’s Republic of China Department of Chemistry and Chemical Engineering Chalmers University of TechnologySE-41296GöteborgSweden Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Engineering and Physics Karlstad University65188 KarlstadSweden Department of Chemistry and Bioscience Aalborg University9220 AalborgDenmark Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Materials Theory Division Department of Physics and AstronomyUppsala University75120 UppsalaSweden Sino-Danish Center for Education and Research 8000 AarhusDenmark School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001People’s Republic of China

All-polymer solar cells(all-PSCs)possess attractive merits including superior thermal stability and mechanical flexibility for large-area roll-to-roll *** flexible conjugation-break spacers(FCBSs)into backbones of polymer donor(P_(D))or polymer acceptor(P_(A))has been demonstrated as an efficient approach to enhance both the photovoltaic(PV)and mechanical properties of the ***,length dependency of FCBS on certain all-PSC related properties has not been systematically *** this regard,we report a series of new non-conjugated P_(A)s by incorporating FCBS with various lengths(2,4,and 8 carbon atoms in thioalkyl segments).Unlike com-mon studies on so-called side-chain engineering,where longer side chains would lead to better solubility of those resulting polymers,in this work,we observe that the solubilities and the resulting photovoltaic/mechanical properties are optimized by a proper FCBS length(i.e.,C2)in P_(A) named *** all-PSC achieves a high efficiency of 11.37%,and excellent mechanical robustness with a crack onset strain of 12.39%,significantly superior to those of the other P_(A)*** results firstly demonstrate the effects of FCBS lengths on the PV performance and mechanical properties of the all-PSCs,providing an effective strategy to fine-tune the structures of P_(A)s for highly efficient and mechanically robust PSCs.

关键词： All-polymer solar cells Flexible conjugation-break spacers Mechanical robustness Polymer acceptors Stretchability

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Electrospinning spinneret:A bridge between the visible world and the invisible nanostructures

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The Innovation 2023年第2期4卷 5-6页

作者： Wenliang Song Yunxin Tang Cheng Qian bumjoon J.kim Yaozu Liao Deng-Guang Yu School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Electrospinning spinneret:A bridge between the visible world and the invisible *** Innovation 4(2),*** novel structures allows for the development of innovative technologies in *** methods to fabricate nanomaterials can be categorized based on the key elements determining the final structures of the *** exhibits unparalleled advantages in the fabrication of nanofiberbased structures by benefitting from the effective interactions between the electrostatic energy and working fluids on a *** a convergence point of fluids and energy,the structure of the spinneret nozzle plays an important role in the working process and the resulting quality of the fibrous structures.

关键词： materials. spinning visible

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