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Host-Guest Active Layer Enabling Annealing-Free,Nonhalogenated Green Solvent Processing for High-Performance organic solar cells

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Chinese Journal of Chemistry 2022年第24期40卷 2963-2972页

作者： Weiwei Sun Haiyang Chen Ben Zhang Qinrong Cheng Heyi Yang Ziyuan Chen Guang Zeng Junyuan Ding Weijie Chen Yaowen Li Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu215123 China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhouJiangsu215123 China 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 UniversitySuzhouJiangsu215123 China

Recent advances in non-fullerene acceptors(NFAs)like Y6 have pushed the power conversion efficiencies(PCEs)of organic solar cells(OSCs)above 19%.However,the harsh fabrication conditions,such as the use of the highly volatile chloroform(CF)solvent and the thermal annealing process,are not suitable for large-area printing technologies and environmental standards.Here,a series of guest molecules,BT2O,BTO,and BT4O,are designed and synthesized with different numbers of oligo ethylene glycol(OEG)repeating units in side chains.All these guest molecules could tune the crystallization kinetics of the annealing-free host-guest active layers by inducing the self-assembly of Y6 in non-halogenated paraxylene(PX)solution.The increasing number of OEG repeating units in guest molecules could enhance the molecular assembly ability but molecular stacking steric hindrance simultaneously.Therefore,BTO with three OEG repeating units blended with PM6:PM7:Y6 delivers the highest PCE of 17.78%.Our results demonstrate controlling the crystallization kinetics via delicate side-chain engineering of guest molecules is an effective way to achieve efficient OSCs in non-halogenated solution.

关键词： organic solar cells Host-guest systems Crystal engineering Annealing-free Nonhalogenated green solvent

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Nonlinear Analysis of organic Polymer solar cells Using Differential Quadrature Technique with Distinct and Unique Shape Function

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Computer Modeling in Engineering & Sciences 2023年第12期137卷 2193-2217页

作者： Ola Ragb Mokhtar Mohamed Mohamed S.Matbuly Omer Civalek Department of Engineering Mathematics and Physics Faculty of EngineeringZagazig UniversityZagazig44519Egypt Basic Science Department Faculty of EngineeringDelta University for Science and TechnologyGamasa11152Egypt Department of Medical Research China Medical University HospitalChina Medical UniversityTaichung404327TaiwanChina

Four numerical schemes are introduced for the analysis of photocurrent transients in organic photovoltaic devices.Themathematicalmodel for organic polymer solar cells contains a nonlinear diffusion-reaction partial differential equation system with electrostatic convection attached to a kinetic ordinary differential equation.To solve the problem,Polynomial-based differential quadrature,Sinc,and Discrete singular convolution are combined with block marching techniques.These schemes are employed to reduce the problem to a nonlinear algebraic system.The iterative quadrature technique is used to solve the reduced problem.The obtained results agreed with the previous exact one and the finite element method.Further,the effects of different times,different mobilities,different densities,different geminate pair distances,different geminate recombination rate constants,different generation efficiencies,and supporting conditions on photocurrent have been analyzed.The novelty of this paper is that these schemes for photocurrent transients in organic polymer solar cells have never been presented before,so the results may be useful for improving the performance of solar cells.

关键词： Sinc differential quadrature block marching organic solar cells discrete singular convolution

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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 cost.In 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 Y6.As 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 OSCs.And 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 OSCs.These 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

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organic Semiconductor Interfaces and Their Effects in organic solar cells

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Chinese Journal of Chemistry 2023年第24期41卷 3792-3805页

作者： Chuanfei Wang Weidong Li Qi Zeng Xianjie Liu Mats Fahlman Qinye Bao School of Materials Science and Engineering Ocean University of ChinaQingdaoShandong266100 China School of Materials Science and Engineering Shanghai University of Engineering ScienceShanghai201620 China Laboratory of organic Electronics ITNLinköping UniversityNorrköping60174 Sweden School of Physics and Electronic Science East China Normal UniversityShanghai200241 China Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of OptoelectronicsFudan UniversityShanghai200433 China

Energy levels and energy level alignment at interfaces play a decisive role in designing efficient and stable organic solar cells(OSCs).In this review two usually used technologies in organic photovoltaic communities for measuring energy levels of organic semiconductors,photoelectron spectroscopy and electrochemical methods,are introduced,and the relationships between the values obtained from the corresponding techniques are compared.The energy level and energy level alignment across the interfaces involved in solution processed organic photovoltaics are described,and the corresponding integer charge transfer model for predicting and explaining energy level alignment is presented.The effects of the interface properties in designing efficient binary and ternary OSCs were discussed.The effects of environmental factors mainly including water vapor,oxygen gas and thermal annealing on energy levels and energy level alignment involved in photoactive layers,and the subsequent effects on the corresponding OSC properties are given.

关键词： organic solar cells Interfaces Donor-acceptor systems Electron transfer Electronic Structures Efficiency

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Thick Active-Layer organic solar cells

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Chinese Journal of Chemistry 2023年第24期41卷 3739-3750页

作者： Zesheng Liu Tengfei Li Yuze Lin Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing100190 China University of Chinese Academy of Sciences Beijing100049 China

organic solar cells(OSCs)present a promising renewable energy technology due to their cost-effectiveness,adaptability,and lightweight nature.The advent of non-fullerene acceptors has further boosted their significance,allowing for power conversion efficiencies surpassing 19%even with an active layer thickness of about 100 nm.However,in order to achieve large scale production,it is necessary to fabricate OSCs with thicker active layers exceeding 300 nm that are compatible with large-area printing techniques.Nevertheless,OSCs with thick active layers have inferior performance compared to those with thin active layers.To expedite the transition of OSCs from laboratory to industrial high-throughput manufacturing,considerable efforts have been made to comprehend the performance limitations of thick active-layer OSCs,develop novel photoactive materials that are high-performance and tolerant towards the thickness of the active layer,and optimize the morphology of the photoactive layer and device structure.This review aims to provide a comprehensive summary of the mechanisms that lead to efficiency loss in thick active-layer OSCs,the representative works on molecular design,and the optimization strategies for high-performance thick active-layer OSCs,and the remaining challenges that must be addressed.

关键词： organic solar cells Charge transport Charge extraction and recombination Thick active layer Energy loss

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Perylene-diimide-based cathode interlayer materials for high performance organic solar cells

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SusMat 2022年第3期2卷 243-263页

作者： Jia Yao Qi Chen Cen Zhang Zhi-Guo Zhang Yongfang Li State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China

organic solar cells(OSCs),benefiting from their significant advantages,such as light weight,flexibility,low cost,and large area manufacturing adaptability,are considered promising clean energy technologies.Currently,the power conversion efficiency(PCE)of state-of-the-art OSCs has reached over 18%through materials and device engineering.Specifically,cathode engineering with cathode interlayer materials(CIMs)is an important strategy to improve the PCEs and stability of OSCs.Among various CIMs reported in the literature,perylene diimides(PDIs)aremore appropriate for working as cathode interlayers in OSCs owing to their distinct advantages of suitable energy levels,high electron affinity,high electron mobility,and facile modification.In this review,the mechanism of cathode engineering is concisely summarized,and recent research progress on PDI derivatives working as CIMs in OSCs is systematically reviewed.Finally,prospects and suggestions are provided for the development of PDI-based CIMs for practical applications.

关键词： cathode interlayers organic solar cells perylene-diimide

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Performance enhancement in organic solar cells and photodetectors enabled by donor phase optimization at the surface of hole transport layer

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Chinese Chemical Letters 2023年第6期34卷 480-486页

作者： Xiaoyang Du Qian Zhang Zeyu He Hui Lin Gang Yang Zhenhua Chen Caijun Zheng Silu Tao School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054China Shanghai Synchrotron Facility(SSRF) Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

The domain purity,material crystallinity and distribution at the interface between the active layer and the transport layer have an important impact on the performance of organic solar cells(OSCs)and organic photodetectors(OPDs),while this focal issue has received less attention in previous studies.From this perspective,a new method to simultaneously enhance the performance of OSC and OPD is proposed,namely,using a sequential deposition method to first construct a compact stacking structure of dualdonor(D18-Cl:PTO2)eutectic in the donor layer,and then induce the ordered deposition of the acceptor(Y6).Compared with the conventional bulk heterojunction(BHJ),the active layer realized by this method not only improves the crystallinity and stacking order of the constituent material on the surface of the transport layer,but also regulates a good vertical distribution,which is conducive to improving the charge transport and extraction efficiency,reducing the leakage current,and enhancing the stability of the device.As a result,the OSC device based on the D18-Cl:PTO2/Y6 structure achieves a power conversion efficiency of up to 17.65%and good light-degradation stability,which is much better than that of BHJbased OSC(PCE of 16.37%).For the OPD,the dark current at reverse bias is reduced by more than an order of magnitude,and the maximum responsivity is improved to 0.52 A/W through the optimization of the donor phase at the interface.Moreover,the strategy does not require additional post-processing compared to the BHJ preparation,which reduces the device construction cost and process complexity,providing an effective way for developing high-performance organic optoelectronic devices.

关键词： organic solar cells organic photodetectors Sequential deposition Vertical distribution Bulk-heterojunction

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A generic approach yields organic solar cells with enhanced efficiency and thermal stability

聚集体(英文)

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聚集体(英文) 2023年第2期4卷 318-328页

作者： Mengyuan Gao Kai Zhang Chunyong He Hanqiu Jiang Xiong Li Qingchun Qi Kangkang Zhou Yu Chen Wenchao Zhao Long Ye School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic SciencesTianjin UniversityCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)TianjinChina Spallation Neutron Source Science Center DongguanChina Institute of High Energy Physics Chinese Academy of Sciences(CAS)BeijingChina Mettler Toledo ShanghaiChina Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjingChina

The use of deuterium are critical for promoting the fundamental understanding of aggregate materials and their new functions.Particularly,the solution structure of conjugated polymers can be hardly resolved without deuteration.However,studies about the isotopic effects of casting solvents on the aggregated structures of photovoltaic polymers and their bulk-heterojunction blends are deficient.Here,the impact of deuterated solvents on the thermal behavior,aggregated structures,and device performance of photovoltaic polymers is clearly delineated for the first time by multiple techniques.The enhanced π-π stacking order of photovoltaic polymers is highly relevant to their relatively poor miscibility with deuterated solvents.Benefiting from higher crystallinity and optimized morphology of deuterated solvents processed films,the devices are able to achieve better efficiency and notable improvement in thermal stability.Our results highlight the isotopic effects of solvents on the aggregated structure of conjugated polymer systems and reveal the potential of innovative approaches to fabricate thermally stable high-efficiency solar cells.

关键词： deuterated solvent organic solar cells phase separation scattering thermal stability

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A Thiazole-Based Polymer Donor for Efficient organic solar cells

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Transactions of Tianjin University 2022年第5期28卷 398-405页

作者： Ye Xu Huifeng Yao Tao Zhang Lijiao Ma 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

The development of new materials plays a critical role in improving the efficiency of organic solar cells(OSCs).At present,the relatively high-lying highest occupied molecular orbital(HOMO)level of the high-efficiency polymer donor is regarded as one of the main reasons for the low open-circuit voltage(V_(OC)).In this work,we introduced the strong electron-withdrawing thiazole unit into the construction of a polymer donor.We designed and prepared an alternating donor-acceptor material,namely PSZ,by copolymerizing 4-methyl thiazole with an electron-donating benzodithiophene unit and studied its application in high-efficiency OSCs.The optical and electrical properties of the new material were characterized by UV-Vis absorption spectroscopy and electrochemical cyclic voltammetry.Results show that PSZ is a typical wide-bandgap material with a high optical bandgap of 2.0 eV and a deep HOMO level of-5.70 eV.When a non-fullerene BTP-eC9 was selected as the acceptor material,V_(OC) reached 0.88 V in the resulting device,and the corresponding power conversion efficiency(PCE)was8.15%.In addition,when PSZ was added as the third component to the binary photoactive combination with PBDB-TF as the donor and BTP-eC9 as the acceptor,V_(OC) of the cell device could be increased,thereby obtaining a high PCE of 17.4%.These results indicated that introducing thiazole units into polymer donors can remarkably reduce the HOMO levels and improve V_(OC) and PCE in OSCs.

关键词： organic solar cells Energy conversion efficiency Polymer donor Thiazole unit

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Healing the degradable organic–inorganic heterointerface for highly efficient and stable organic solar cells

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InfoMat 2022年第2期4卷 162-170页

作者： Yangdan Tao Haoran Liu Di Wang Feng Zhao Zeng Chen Haiming Zhu Hongzheng Chen Chang-Zhi Li State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhouChina Department of Chemistry Zhejiang UniversityHangzhouChina

The heterointerface between the contacted organic and inorganic semiconductors critically affects the charge extraction,hence overall performance of organic optoelectronics,especially for organic solar cells(OSCs).Herein,we develop an effective interfacial strategy that simultaneously boosts the chemical,electric,and electronic properties of the organic–inorganic heterointerface of the derived OSCs,through implanting conjugated molecules as selfassemble monolayers(SAMs)to metal oxide nanoparticles(MO NPs).As results,SAM passivated zinc oxide nanoparticles(ZnO NPs)as electron transport layers(ETLs)not only enable the best performed OSCs containing MO ETLs,but also exhibit the most desirable thickness insensitive features(up to 300 nm).In addition,SAM-ZnO ETLs help also substantially improving the photostability of the derived OSCs.Overall,this work can be beneficial to the further development of high-performance and cost-effective OSCs.

关键词： charge extraction organic-inorganic heterointerface organic solar cells photostability

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