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Delicate chemical structure regulation of nonfullerene acceptor for efficient and large thickness organic solar cells

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Science China Chemistry 2024年第5期67卷 1596-1604页

作者： Zhe Zhang Wanying Feng Yunxin Zhang Shaohui Yuan Yuyang Bai Peiran Wang Zhaoyang Yao Chenxi Li Tainan Duan Xiangjian Wan bin kan Yongsheng Chen State Key Laboratory and Institute of Elemento-Organic Chemistry Frontiers Science Center for New Organic MatterThe Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071China School of Materials Science and Engineering National Institute for Advanced MaterialsNankai UniversityTianjin 300350China Chongqing Institute of Green and Intelligent Technology Chongqing SchoolUniversity of Chinese Academy of Sciences(UCAS Chongqing)Chinese Academy of SciencesChongqing 400722China

Inspired by the success of CH-series acceptors, a small-molecular acceptor, CH-Tz was reported by adopting a new conjugationextended electron-deficient unit([1,2,5]thiadiazolo[3,4-b]pyrazine) on the central core. Owing to the enhanced inter-/intramolecular interactions, CH-Tz exhibited near-infrared absorption and an effective three-dimensional molecular packing network in its single crystal. When blended with polymer donor PM6, the binary device achieved a high power conversion efficiency(PCE) of 18.54%, with a notable short-circuit current density(J_(sc)) of 27.54 m A cm-2and an excellent fill factor(FF) over 80%,which can be partly ascribed to the balanced charge transport properties in the blend film. After employing D18-Cl as the third component, an enhanced PCE of 18.85% was achieved due to a more obvious fiber network. Impressively, the CH-Tz-based OSC devices show excellent thermal stability and thickness insensitivity. Record-breaking Jscof 28.92 m A cm-2was reached for PM6:D18-Cl:CH-Tz ternary device with a thickness of 560 nm. Besides, CH-Tz shows potential in fabricating multicomponent high-performance organic solar cells, where over 19% efficiency could be realized in the quaternary device. Our work advances the strong influence of electron-deficient central units on molecular photovoltaic properties and guides the design of acceptors for stable and large-thickness organic solar cells.

关键词： organic solar cells non-fullerene acceptor central unit large thickness molecular packing

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A case study of comparing two dimerized acceptor molecules built by different branch-connected and terminal-connected approaches

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Science China Chemistry 2024年第5期67卷 1687-1696页

作者： kangqiao Ma Huazhe Liang Yuxin Wang Tengfei He Tainan Duan Xiaodong Si Wendi Shi Guankui Long Xiangjian Cao Zhaoyang Yao Xiangjian Wan Chenxi Li bin kan Yongsheng Chen State Key Laboratory and Institute of Elemento-Organic Chemistry Frontiers Science Center for New Organic MatterThe Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsInstitute of Polymer ChemistryRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071China School of Materials Science and Engineering National Institute for Advanced MaterialsRenewable Energy Conversion and Storage Center(RECAST)Nankai UniversityTianjin 300350China Chongqing Institute of Green and Intelligent Technology Chongqing SchoolUniversity of Chinese Academy of Sciences(UCAS Chongqing)Chinese Academy of SciencesChongqing 400015China

Dimerized small-molecule acceptors(SMAs) built by the conventional connection of terminal groups of monomers have contributed to exciting long-term stabilities of organic solar cells(OSCs). However, device efficiencies, especially fill factors(FFs), still need to be improved. This probably originates from unsymmetrical molecular structure/conformation-determined less compact/ordered molecular stackings, such as ineffective stackings of constraint terminals. Herein, an exotic dimerized SMA of BC-Th is established by bridging the branched groups(BC-type, branch coupling) of two monomers rather than conventional terminal units(TC-type, terminal coupling). Benefiting from the three-dimensional conformation and more uncurbed terminals,BC-Th exhibits multiple molecular orientations along with a larger dielectric constant and electron mobility compared with TCTh. Finally, an efficiency of 17.43% is achieved by BC-Th-based OSCs, along with the highest FF of 79.13% among all dimerized SMAs-based OSCs to date. When introducing L8-BO as the third component, overall enhanced efficiency of 18.05%and FF of 80.11% are further afforded. Contrarily, TC-Th-based OSCs exhibit much inferior PCE of 16.29% and FF of 74.81%,demonstrating the great advantages of “branch coupling” over “terminal coupling” when building dimerized SMAs.

关键词： organic solar cells dimerized acceptor molecules branch coupling morphology control stability

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Role of savolitinib in advanced gastric adenocarcinoma with meningeal carcinomatosis and cerebellar metastasis:A case report

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World Journal of Clinical Cases 2024年第15期12卷 2636-2641页

作者： Zhi-Yun Weng Wen-Ye Huang bin-kan Shi Jian-Jia Pan Department of Hematology The Affiliated Yueqing Hospital of Wenzhou Medical UniversityYueqing 325600Zhejiang ProvinceChina

BACKGROUND Brain metastases(BM)are very rare in gastric adenocarcinoma(GaC),and patients with BMs have a higher mortality rate due to stronger tumor aggressiveness.However,its pathogenesis remains unclear.Genetic testing revealed cellular-mesenchymal epithelial transition factor receptor(MET)amplification.Therefore,treatment with savolitinib,a small molecule inhibitor of c-Met,was selected.CASE SUMMARY A 66-year-old woman was diagnosed with advanced GaC 6 months prior to presentation due to back pain.Cerebellar and meningeal metastases were observed during candonilimab combined with oxaliplatin and capecitabine therapy.The patient experienced frequent generalized seizures and persistent drowsiness in the emergency department.Genetic testing of cerebrospinal fluid and peripheral blood revealed increased MET amplification.After discussing treatment options with the patient,savolitinib tablets were administered.After a month of treatment,the intracranial lesions shrank considerably.CONCLUSION BM is very rare in advanced GaC,especially in meningeal cancer,that is characterized by rapid disease deterioration.There are very few effective treatment options available;however,technological breakthroughs in genomics have provided a basis for personalized treatment.Furthermore,MET amplification may be a key driver of BM in gastric cancer;however,this conclusion requires further investigation.

关键词： Cellular-mesenchymal epithelial transition factor receptor Savolitinib Meningeal carcinomatosis Gastric adenocarcinoma Case report

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Flexible organic solar cells for biomedical devices

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Nano Research 2021年第9期14卷 2891-2903页

作者： bin kan Faheem Ershad Zhoulyu Rao Cunjiang Yu Department of Mechanical Engineering University of HoustonHoustonTX 77204USA Department of Biomedical Engineering University of HoustonHoustonTX 77204USA Materials Science and Engineering Program University of HoustonHoustonTX 77204USA Department of Electrical and Computer Engineering University of HoustonHoustonTX 77204USA Texas Center for Superconductivity University of HoustonHoustonTX 77204USA

Organic solar cells(OSCs),particularly made based on solution processing methods,have made significant progress over the past decades through the concurrent evolution of organic photovoltaic materials and device engineering.Recently,high power conversion efficiencies around 18%and over 16%have been demonstrated in both rigid and flexible OSCs,respectively.While most of the OSC research has centered on efficiency and cost,their emerging and potential usages in many critical applications,particularly in biomedical fields have been rising.In this mini-review,we will briefly discuss the high-performance organic photovoltaic materials and the representative flexible OSCs to give a scope on the recent rapid development of OSCs.Besides,we will review some progress on the applications of OSCs in biomedical devices and integrated systems.The potential challenges associated with integrating OSCs for biomedical devices will be put forward.

关键词： organic solar cells photovoltaic flexible biomedical bioelectronics

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Calixarenes enabling well-adjusted organic-inorganic interface for inverted organic solar cells with 18.25%efficiency and multifold improved photostability under max power point tracking

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Science China Chemistry 2023年第1期66卷 195-201页

作者： Shitong Li Zheng Xiao Juan-Juan Li Zong-Ying Hu Yang Yang bin kan Dong-Sheng Guo Xiangjian Wan Zhaoyang Yao Chenxi Li Yongsheng Chen State Key Laboratory of Elemento-Organic Chemistry The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai University Tianjin300071China College of Materials Science and Engineering Nankai UniversityTianjin 300350China The Institute of Seawater Desalination and Multipurpose Utilization Ministry of Natural Resources(Tianjin)Tianjin 300192China

Compared with organic solar cells(OSCs) adopting conventional architecture,inverted OSCs have offered generally better stability,where Zn O is the most widely used electron transporting layer(ETL) material.For ZnO-based inverted OSCs,a welltuned interface of organic(active layer)-inorganic(Zn O film) with matched surface energy(γS) is critical for both high performance and high stability.In this work,two typical calixarenes,C4A and Bu C4A,were employed as the tuning agents to adjust this organic-inorganic interface for ZnO-based inverted OSCs.As a result,with PM6:L8-BO as the active layer,significantly promoted power conversion efficiencies(PCEs) from 17.14%(for ZnO) to 18.25%(for ZnO/C4A) and 17.80%(for ZnO/Bu C4A) were achieved.Photodynamic studies indicate that the enhanced performance is due to the faster charge extraction process,the suppressed recombination and more ideal internal electric field in ZnO/calixarene-based devices.In addition,wellmatched interface energy and more ordered molecular aggregation in active layer effectively improved photostability and thermal stability for ZnO/calixarene-based devices.These results indicate that calixarenes could act as effective modifying agents of ZnO to improve inverted OSCs’ performance and stability simultaneously,and likely also stimulate calixarenes’ and other macromolecules’ broader studies in other organic electronic devices.

关键词： organic solar cell calixarenes interface adjustment ZnO modification high performance high stability

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P-doped all-small-molecule organic solar cells with power conversion efficiency of 17.73%

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Science China Chemistry 2023年第8期66卷 2371-2379页

作者： Wanying Feng kangqiao Ma Guangkun Song Tianyin Shao Huazhe Liang Shudi Lu Yu Chen Guankui Long Chenxi Li Xiangjian Wan Zhaoyang Yao bin kan Yongsheng Chen State Key Laboratory and Institute of Element-Organic Chemistry The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin300071China School of Materials Science and Engineering National Institute for Advanced MaterialsNankai UniversityTianjin300350China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing100043China State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou510640China

All-small organic solar cells(ASM OSCs)inherit the advantages of the distinct merits of small molecules,such as well-defined structures and less batch-to-batch variation.In comparison with the rapid development of polymer-based OSCs,more efforts are needed to devote to improving the performance of ASM OSCs to close the performance gap between ASM and polymer-based OSCs.Herein,a well-known p-dopant named fluoro-7,7,8,8-tetracyano-p-quinodimethane(FTCNQ)was introduced to a highefficiency system of HD-1:BTP-e C9,and a high power conversion efficiency(PCE)of 17.15%was achieved due to the improved electrical properties as well as better morphology of the active layer,supported by the observed higher fill factor(FF)of 79.45%and suppressed non-radiative recombination loss.Furthermore,combining with the further morphology optimization from solvent additive of 1-iodonaphthalene(IN)in the blend film,the HD-1:BTP-e C9-based device with the synergistic effects of both FTCNQ and IN demonstrates a remarkable PCE of 17.73%(certified as 17.49%),representing the best result of binary ASM OSCs to date.

关键词： organic solar cells all-small-molecule power conversion efficiency p-dopant

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Recent progress on all-small molecule organic solar cells using small-molecule nonfullerene acceptors

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InfoMat 2021年第2期3卷 175-200页

作者： bin kan Yuanyuan kan Lijian Zuo Xueliang Shi Ke Gao Department of Materials Science and Engineering University of WashingtonSeattleWashington

Recently,solution-processed organic solar cells combining small-molecule donor and nonfullerene acceptor have achieved breakthrough results with the certified efficiency over 15%.These impressive progresses are driven by the concerted efforts of modifying the donor and acceptor materials and optimizing the morphology.Considering the defined chemical structures and easily tuned properties of small-molecule materials,it is of great necessity and importance to pay more attentions on the topic of all-small molecule organic solar cells.Here,we summarize the recent progress of all-small molecule organic solar cells from the prospect of materials'evolutions and expect to provide some hints for its future developments.The involved small-molecule donors including oligothiophene-,benzodithiophene-,naphthodithiophene-,and porphyrin-based materials are discussed to illustrate the relationship of chemical structures,properties,and device performance.Then,the small-molecule nonfullerene acceptors in all-small molecules organic solar cells are discussed to highlight their vital role.Finally,we will present the challenges and future of this research area.

关键词： all-small molecule organic solar cells high-performance nonfullerene acceptors small-molecule donors

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基于自然-经济综合视角的碳排放强度与生态盈亏多情景模拟研究——以淮海经济区为例

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生态学报 2024年第6期44卷 2199-2215页

作者：袁建勋方斌阚红云何莎莎南京师范大学地理科学学院南京210023 南京师范大学新型城镇化与土地问题研究中心南京210023 江苏省地理信息资源开发与利用协同创新中心南京210023 华中师范大学公共管理学院武汉430079

生态盈亏与碳排放强度是衡量生态环境质量与经济发展水平的重要指标,分析两者时空关联并预测未来演进方向对提升区域生态环境质量健康水平具有指导作用。以淮海经济区为研究对象,以2000年、2010年和2020年3期土地利用数据为基础,运用PLU... 详细信息

生态盈亏与碳排放强度是衡量生态环境质量与经济发展水平的重要指标,分析两者时空关联并预测未来演进方向对提升区域生态环境质量健康水平具有指导作用。以淮海经济区为研究对象,以2000年、2010年和2020年3期土地利用数据为基础,运用PLUS模型、双变量自相关、耦合协调度及面板计量回归模型等方法,预测并分析淮海经济区2000—2036年3种情景下碳排放强度、生态盈亏的演化特征及时空关联。结果表明:(1)常规发展情景下,淮海经济区生态性呈下降趋势,强耕地保护情景下生态性微有下降,强生态保护情景下,生态性有所上升,自然要素是主导。(2)常规发展情景下,淮海经济区碳排放量逐渐加大,强耕地保护及强生态保护情景下,则呈下降趋势;三种状态下,碳排放强度均呈下降趋势,时间轴2010—2020年降幅较大,空间序河流水系地区碳排放强度降幅较大。(3)淮海经济区碳排放强度与生态盈亏呈负相关关系,低低和低高聚类主要分布在城镇建设用地周边,高低和高高聚类分布在人类干扰较少的自然区域;高高聚类主要位于河流水系交汇区,表明水域有效降低碳排放强度的功能。(4)淮海经济区的碳排放强度与生态盈亏之间的耦合协调度呈东西高、中部低的态势,高耦合协调度主要分布于低高聚类,即自然地区域,低耦合协调度主要分布于西部平原区;科学技术、经济发展水平及二产占比对耦合协调度呈正影响,城镇化率、道路密度呈负影响。研究认为,淮海经济区当前的土地利用方式,不利于区域环境质量的改善,建议进一步强化建设用地管控、大力推进高标准农田建设和水域保护,以耕地质量提升和水域保护加强提升粮食主产区环境质量健康水平。

关键词：土地利用多情景碳排放强度生态盈亏淮海经济区

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A chlorinated low-bandgap small-molecule acceptor for organic solar cells with 14.1% efficiency and low energy loss

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Science China Chemistry 2018年第10期61卷 1307-1313页

作者： bin kan Huanran Feng Huifeng Yao Meijia Chang Xiangjian Wan Chenxi Li Jianhui Hou Yongsheng Chen State Key Laboratory and Institute of Elemento-Organic Chemistry The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials College of Chemistry Nankai University 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

A new acceptor-donor-acceptor(A-D-A) type small-molecule acceptor NCBDT-4 Cl using chlorinated end groups is reported.This new-designed molecule demonstrates wide and efficient absorption ability in the range of 600–900 nm with a narrow optical bandgap of 1.40 eV. The device based on PBDB-T-SF:NCBDT-4 Cl shows a power conversion efficiency(PCE) of 13.1%without any post-treatment, which represents the best result for all as-cast organic solar cells(OSCs) to date. After device optimizations, the PCE was further enhanced to over 14% with a high short-circuit current density(Jsc) of 22.35 m A cm-2 and a fill-factor(FF) of 74.3%. The improved performance was attributed to the more efficient photo-electron conversion process in the optimal device. To our knowledge, this outstanding efficiency of 14.1% with an energy loss as low as 0.55 eV is among the best results for all single-junction OSCs.

关键词：太阳能电池小分子氯化器官损失精力设备优化吸收能力

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A series of dithienobenzodithiophene based small molecules for highly efficient organic solar cells

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Science China Chemistry 2017年第4期60卷 552-560页

作者： Huanran Feng Miaomiao Li Wang Ni bin kan Yunchuang Wang Yamin Zhang Hongtao Zhang Xiangjian Wan Yongsheng Chen Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials State Key Laboratory and Institute of Elemento-Organic Chemistry Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) College of Chemistry Nankai University Tianjin 300071 China School of Materials Science and Engineering National Institute for Advanced Materials Nankai University Tianjin 300071 China

Three acceptor-donor-acceptor(A-D-A) small molecules DCAODTBDT,DRDTBDT and DTBDTBDT using dithieno[2,3-d:2',3'-d']benzo[l,2-b:4,5-b']dithiophene as the central building block,octyl cyanoacetate,3-octylrhodanine and thiobarbituric acid as the end groups were designed and synthesized as donor materials in solution-processed photovoltaic cells(OPVs).The impacts of these different electron withdrawing end groups on the photophysical properties,energy levels,charge carrier mobility,morphologies of blend films,and their photovoltaic properties have been systematically investigated.OPVs device based on DRDTBDT gave the best power conversion efficiency(PCE) of 8.34%,which was significantly higher than that based on DCAODTBDT(4.83%) or DTBDTBDT(3.39%).These results indicate that rather dedicated and balanced consideration of absorption,energy levels,morphology,mobility,etc.for the design of small-molecule-based OPVs(SM-OPVs)and systematic investigations are highly needed to achieve high performance for SM-OPVs.

关键词：有机太阳能电池小分子硫代巴比妥酸载流子迁移率功率转换效率能量水平光伏性能分子设计

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