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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 (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

A homopolymer based on double B←N bridged bipyridine as electron acceptor for all-polymer solar cells

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Chinese Chemical Letters 2018年第9期29卷 1343-1346页

作者： Xiaojing Long Chuandong Dou Jun Liu Lixiang Wang State Key Laboratory of polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences

polymer electron acceptors for all-polymer solar cells （all-PSCs） are usually conjugated copolymers, which contain alternating electron-rich units and electron-deficient units. In this manuscript, we report a conjugated homopolymer （P-BNBP） based on an electron-deficient unit of double B,--N bridged bipyridine, which can be used as electron acceptor for all-polymer solar cells. P-BNBP shows low-lying LUMO energy level of -3.59eV, high absorption coefficient of 1.6 ×10^5Lmo1^-1 cm^-1 at 626nm and moderate electron mobility of 4.37 ×10^-6cm^2V^-1s^-1. AII-PSC devices exhibit power conversion efficiencies of 2.44%-3.04%. These results demonstrate that conjugated homopolymers are promising as electron acceptor materials for alI-PSCs.

关键词： all-polymer solar cells Homopolymer Electron acceptor B←N coordination bond Yamamoto polymerization

Morphology control in high-efficiency all-polymer solar cells

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InfoMat 2022年第4期4卷 48-70页

作者： Kangkang Zhou Kaihu Xian Long Ye School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic SciencesTianjin UniversityTianjinChina State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchunChina

all-polymer solar cells(all-PSCs)have attracted tremendous research interest in the recent decade due to the great potentials in stretchable electronic applications in terms of long-term stability and mechanical *** by the molecular design of novel polymer acceptors and morphology optimization,the power conversion efficiency(PCE)of all-PSCs has developed rapidly and now exceeded 17%.This review outlines the promising strategies for high-performance all-PSCs from the aspect of morphology control with the motivation to rationally guide the *** this review,we briefly discuss the thermodynamic mixing principles of all-polymer blends and the effects of the molecular structure of conjugated polymers on thin-film morphology in *** crucial role of molecular miscibility in influencing morphological features and performance metrics was *** also expound on the effective methods of controlling film morphology through properly tuning the aggregation behavior of *** particular,insightful studies on the commonly used naphthalene diimide-based acceptor polymers and the newly emerging polymerized nonfullerene small molecule acceptors(ITIC-series,Y6-series,etc)are discussed in ***,we present an outlook on the major challenges and the new opportunities of all-PSCs for efficiency breakthroughs targeting 20%.

关键词： aggregated structure all-polymer solar cells morphology tuning photovoltaic polymers polymer acceptor

Optimizing the morphology of all-polymer solar cells for enhanced photovoltaic performance and thermal stability

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Journal of Semiconductors 2023年第5期44卷 34-41页

作者： Kang An Wenkai Zhong Chunguang Zhu Feng Peng Lei Xu Zhiwei Lin Lei Wang Cheng Zhou Lei Ying Ning Li Fei Huang Institute of polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Frontiers Science Center for Transformative Molecules Center of Hydrogen Scienceand School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China South China Institute of Collaborative Innovation Dongguan 523808China South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou 510640China School of Light Industry and Engineering&State Key Laboratory of Pulp&Paper Engineering South China University of TechnologyGuangzhou 510640China

Due to the complicated film formation kinetics, morphology control remains a major challenge for the development of efficient and stable all-polymer solar cells(all-PSCs). To overcome this obstacle, the sequential deposition method is used to fabricate the photoactive layers of all-PSCs comprising a polymer donor PTzBI-oF and a polymer acceptor PS1. The film morphology can be manipulated by incorporating amounts of a dibenzyl ether additive into the PS1 layer. Detailed morphology investigations by grazing incidence wide-angle X-ray scattering and a transmission electron microscope reveal that the combination merits of sequential deposition and DBE additive can render favorable crystalline properties as well as phase separation for PTzBI-oF:PS1 blends. Consequently, the optimized all-PSCs delivered an enhanced power conversion efficiency(PCE) of 15.21%along with improved carrier extraction and suppressed charge recombination. More importantly, the optimized all-PSCs remain over 90% of their initial PCEs under continuous thermal stress at 65 °C for over 500 h. This work validates that control over microstructure morphology via a sequential deposition process is a promising strategy for fabricating highly efficient and stable all-PSCs.

关键词： morphology all-polymer solar cells thermal stability sequential deposition

Host-Guest Strategy Enabling Nonhalogenated Solvent Processing for High-Performance all-polymer Hosted solar cells

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Chinese Journal of Chemistry 2023年第9期41卷 1066-1074页

作者： Yuting Huang Haiyang Chen Qunping Fan Ziyuan Chen Junyuan Ding Heyi Yang Zhe Sun Rui Zhang Weijie Chen Changduk Yang Feng Gao Yaowen Li Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhouJiangsu 215123China State and Local Joint Engineering Laboratory for Novel Functional polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'anShaanxi 710049China Department of Energy Engineering School of Energy and Chemical EngineeringPerovtronics Research CenterLow Dimensional Carbon Materials CenterUlsan National Institute of Science and Technology(UNIST)UlsanRepublic of Korea Department of Physics Chemistry and Biology(IFM)Linkoping UniversityLinkopingSweden

The power conversion efficiencies(PCEs)of all-polymer solar cells(all-PSCs),usually processed from low-boiling-point and toxic sol-vents,have reached high values of 18%.However,poor miscibility and uncontrollable crystallinity in polymer blends lead to a nota-ble drop in the PCEs when using green solvents,limiting the practical development of ***,a third component(guest)BTO was employed to optimize the miscibility and enhance the crystallinity of PM6/PY2Se-F host film processed from green solvent toluene(TL),which can effectively suppress the excessive aggregation of PY2Se-F and facilitate a nano-scale interpenetrating net-work morphology for exciton dissociation and charge *** a result,TL-processed all-polymer hosted solar cells(all-PHSCs)exhibited an impressive PCE of 17.01%.Moreover,the strong molecular interaction between the host and guest molecules also en-hances the thermal stability of the *** host-guest strategy provides a unique approach to developing high-efficiency and stable all-PHSCs processed from green solvents,paving the way for the industrial development of all-PHSCs.

关键词： all-polymer solar cells Host-guest systems Crystal engineering Nonhalogenated green solvent Stability Morphology Miscibility Ternary blend solar cells

A Widely Applicable n-Type Molecular Doping for Enhanced Photovoltaic Performance of all-polymer solar cells

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A Widely Applicable n-Type Molecular Doping for Enhanced Pho...

Enhanced Charge Transfer, Transport and Photovoltaic Efficiency in all-polymer Organic solar cells by polymer Backbone Fluorinationt

第五届新型太阳能电池学术研讨会

作者： Yalong Xu Jianyu Yuan Jianxia Sun Yannan Zhang Xufeng Ling Haihua Wu Guobing Zhang Junmei Chen Yongjie Wang Wanli Ma Soochow University

A widely applicable doping design for emerging nonfullerene solar cells would be an efficient strategy in order to further improve device ***, a family of n-dopants: tetrabutylammonium fluoride(TBAF), tetrabutylammonium chloride(TBACl),tetrabutylammonium bromide(TBABr), tetrabutylammonium iodide(TBAI), containing Lewis base anions are considered as efficient n-dopants for improving polymer-polymer solar cells(all-PSCs) *** all cases, slightly increased short-circuit current density(J) and significantly increased fill factor(FF) are observed, leading to a best PCE of 7.0 % for all-PSCs compared to that of 5.8 % in undoped *** improvement may be attributed to interaction between different anions X-(X=F, Cl, Br, I) in TBAX with the polymer *** reveal that adding TBAX at relatively low content does not alter active layer morphology, while it can reduce the work function(WF) of the electron *** find this simple solution-processed n-type molecular doping can efficiently suppress charge recombination in the bulk film and at the interface, resulting in improved FF and *** importantly, our results allow exciting new insights into the role of molecular dopants in affecting the operation of current nonfullerene organic solar cells.

关键词： n-type doping all-polymer solar cells charge recombination tetrabutylammonium iodide(TBAI) morphology electron transfer

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Chinese Journal of Chemistry 2018年第4期36卷 280-286页

作者： jianxia Sun Feng Jin Haibin Zhao Jianyu Yuan Wanli Ma Institute of Functional Nano & Soft Material (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow Unversity 199 Ren'ai Road Suzhou Jiangsu 215123 China Shanghai Ultra-precision Optical Manufacturing Engineering ResearchCenter and Key Laboratory of M cro and Nano Photonic Structures(Minstry of Education) Department of Optical Science and EngineeringFudan University Shanghai 200433 China

We successfully designed and synthesized two BDT-BT-T （BDT=benzo[1,2-b：4,5-b＇]dithiophene, BT-T=4,7-dithien-2-yl-2,1,3-benzothia- diazole） based polymers as the electron donor for application in all-polymer solar cells （all-PSCs）. By adopting N2200 as the electron acceptor, we system- atically investigated the impact of fluorination on the charge transfer, transport, blend morphology and photovoltaic properties of the relevant alI-PSCs. A best power conversion efficiency （PCE） of 3.4% was obtained for fluorinated PT-BT2F/N2200 （BT2F=difluorobenzo[c][1,2,5]thiadiazole） alI-PSCs in com- parison with that of 2.7% in non-fluorinated PT-BT/N2200 （BT=benzothiad（azole） based device. Herein, all-polymers blends adopting either non-fluori- nated PT-BT or fluorinated PT-BT2F exhibit similar morphology features. In depth optical spectrum measurements demonstrate that molecular fluorina- tion can further enhance charge transfer between donor and acceptor polymer. Moreover, all-polymer blends exhibit improved hole mobilities and more balanced carriers transport when adopting fluorinated donor polymer PT-BT2F. Therefore, although the PCE is relatively low, our findings may become important in understanding how subtle changes in molecular structure impact relevant optoelectronic properties and further improve the performance of all-PSCSs.

关键词： all-polymer solar cells fluorination charge transfer carrier transport morphology

Non-Fully Conjugated Photovoltaic Materials with Y-Series Acceptor Backbone for High-Performance Organic solar cells

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Chinese Journal of Chemistry 2024年第11期42卷 1307-1318页

作者： Hairui Bai Qunping Fan Ruijie Ma Xia Guo Wei Ma Maojie Zhang State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’anShaanxi710049 China National Engineering Research Center for Colloidal Materials School of Chemistry&Chemical EngineeringShandong UniversityJinanShandong250100 China Department of Electronic and Information Engineering Research Institute for Smart Energy(RISE)The Hong Kong Polytechnic UniversityKowloon999077 Hong KongChina

In the last few years,organic solar cells(OSCs)have made significant progress in photovoltaic performance,mainly due to the innovative development of active layer materials,especially Y-series and related derivatives as acceptors which have become the key factor that boosts the power conversion ***,to achieve high-performance OSCs,an emerging molecular design strategy of applying flexible alkyl units as linkers to construct non-fully conjugated acceptors has been developed and addressed great *** review highlights the non-fully conjugated photovoltaic materials with Y-series backbone that enable high-performance *** OSCs have been achieved by some representative non-fully conjugated material *** related molecular design strategies are discussed in ***,a brief summary and future prospect are provided in advancing the non-fully conjugated photovoltaic materials with Y-series backbone towards the brighter future.

关键词： Organic solar cells all-polymer solar cells Non-fully conjugated photovoltaic materials Power conversion efficiency polymer acceptors Organicel ectronics

An Alternating polymer of Two Building Blocks Based on B←N Unit:Non-fullerene Acceptor for Organic Photovoltaics

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Chinese Journal of polymer Science 2017年第2期35卷 198-206页

作者： Ru-yan Zhao 窦传冬刘俊 Li-xiang Wang State Key Laboratory of polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Chinese Academy of Sciences Beijing 100049China

B-N coordination bond can be used to develop polymer electron acceptors for efficient all-polymer solar cells （all-PSCs）. Here, we report a new alternating conjugated polymer containing two building blocks based on B-N unit. The polymer exhibits strong light absorption in the visible range, low-lying LUMO/HOMO energy levels and moderate electron mobility. The resulting all-PSC devices exhibit power conversion efficiencies of 1.50%-2.47%.

关键词： all-polymer solar cells polymer acceptor Boron B-N coordination bond

n-Octyl substituted quinoxaline-based polymer donor enabling all-polymer solar cell with efficiency over 17%

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Science Bulletin 2022年第20期67卷 2096-2102,M0004页

作者： Ke Hu Can Zhu Shucheng Qin Wenbin Lai Jiaqi Du Lei Meng Zhanjun Zhang Yongfang Li School of Chemical Science University of Chinese Academy of SciencesBeijing 100049China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou215123China

Recently, the power conversion efficiencies(PCEs) of all-polymer solar cells(all-PSCs) have increased rapidly. To further increase the PCE of all-PSCs, it is necessary to create new donor polymers matching the polymer acceptors. In this paper, we synthesize a new quinoxaline-based polymer donor PBQ8 with n-octyl side chain on the quinoxaline unit, which possesses the same skeleton structure to the previously reported PBQ5(with isooctyl side chain). The effects of alkyl side chains on the physicochemical properties of the polymer donor were investigated. In comparison with PBQ5, PBQ8 exhibits stronger intermolecular interactions and better molecular packing. When blending with polymer acceptor PY-IT, the PBQ8:PY-IT based devices demonstrated a higher PCE value of 17.04%, which is one of the highest PCEs occurred in the all-PSCs. And the PBQ5:PY-IT(PCE 15.56%, Voc0.907 V, FF 69.72%, and Jsc24.60 m A cm^(-2)) is much lower. The PBQ8:PY-IT blend displayed more efficient exciton dissociation, better molecular stacking properties, preferable phase separation and higher mobility. These indicate that as an effective method, side chain engineering can improve the efficiency of the all-PSCs.

关键词： all-polymer solar cells Side-chain engineering Difluoroquinoxaline A-unit polymerized small molecule acceptors