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Breaking 12% efficiency in flexible organic solar cells by using a composite electrode

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Science China Chemistry 2019年第7期62卷 851-858页

作者： Guang Zeng Jingwen Zhang Xiaobin Chen Hongwei Gu Yaowen li yongfang li Laboratory of Advanced Optoelectronic Materials College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China College of Materials Science and Engineering Nanchang Hangkong University Nanchang 330063 China

The performance of flexible organic solar cells(OSCs)significantly relies on the quality of transparent flexible ***,we used silver nanowires(AgNWs)with various weight ratios to dope high-conductive poly(3,4-ethylenedioxythiophene):polystyrene sulfonate(PH1000)to optimize the optical and electronic properties of PH1000 film.A high-quality flexible composite electrode PET/Ag-mesh/PH1000:AgNWs-20 with smooth surface,a low sheet resistance of 6Ω/sq and a high transmittance of 86%at 550-nm wavelength was obtained by doping 20 wt%AgNWs to PH1000(PH1000:AgNWs-20).The flexible OSCs based on the PET/Ag-mesh/PH1000:AgNWs-20 electrode delivered a power conversion efficiency(PCE)of12.07%with an open circuit voltage(Voc)of 0.826 V,a short-circuit current density(Jsc)of 20.90 m A/cm2and a fill factor(FF)of69.87%,which is the highest reported PCE for the flexible indium-tin oxide(ITO)-free *** work demonstrated that the flexible composite electrodes of PET/Ag-mesh/PH1000:AgNWs are promising alternatives for the conventional PET/ITO electrode,and open a new avenue for developing high-performance flexible transparent electrode for optoelectronic devices.

关键词： flexible electrodes flexible organic solar cells silver nanowire composite electrode power conversion efficiency

High-Performance D-A Copolymer Donor Based on Difluoroquinoxaline A-Unit with Alkyl-Chlorothiophene Substituents for Polymer Solar Cells

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CCS Chemistry 2023年第10期5卷 2378-2388页

作者： Can Zhu Ke Hu Lei Meng Xiaolei Kong Wenbin Lai Shucheng Qin Beibei Qiu Jinyuan Zhang Zhanjun Zhang Yilei Wu Xiaojun li yongfang li Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190 School of Chemical Science University of Chinese Academy of SciencesBeijing 100049 Key Laboratory of Solid State Optoelectronic Devices of Zhejiang Province College of Physics and Electronic Information EngineeringZhejiang Normal UniversityJinhuaZhejiang 321004 Department of Chemical Engineering Stanford UniversityStanfordCalifornia 94305-4125 Laboratory of Advanced Optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123

Side chain engineering with fluorine substitution is widely used to enhance photovoltaic performance of polymer donors in the research field of polymer solar cells(PSCs).However,fluorine substitution has disadvantages of complicated synthesis and high ***,we synthesized a novel D-A copolymer donor PBQ9 based on difluoroquinoxaline A-unit with chlorine substitution on its alkyl-thiophene side chains instead of fluorine substitution in the polymer donor PBQ6,which greatly shortens the synthetic route and reduces the ***,the optimized binary PSC with PBQ9 as polymer donor and m-TEH as acceptor demonstrated a high power conversion efficiency(PCE)of 18.81%(certified PCE of 18.33%by National Institute of Metrology,China)with a high fill factor of 80.59%,and the photovoltaic performance of the PSCs is insensitive to the different batches of the polymer *** results indicate that PBQ9 is a high-performance polymer donor and that chlorine substitution is an effective strategy to improve photovoltaic performance and reduce the cost of polymer donors.

关键词： D-A copolymer donors polymer solar cells difluoroquinoxaline A-unit chlorothiophene substituents

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双纤维网络形貌助力高效单结有机太阳能电池

Science Bulletin 2022年第13期67卷 1310-1312页

作者：李永舫 Institute of Chemistry Chinese Academy of SciencesBeijing 100190China College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

Organic solar cells(OSCs),based on a blend active layer of a ptype organic semiconductor as donor and an n-type organic semiconductor as acceptor,have attracted great attention due to their advantages of simple device structure,light weight and mechanical *** conversion efficiency(PCE)of the OSCs is increasing quickly in recent years,mainly benefitted from the development of narrow bandgap and deep absorbing A-DA’D-A structured small molecule acceptors(SMAs)[1–3]and the wide bandgap conjugated polymer donors[4–6].

关键词： network double narrow

Impact of Alkoxyl Tail of Fullerene Dyad Acceptor on Crystalline Microstructure for Efficient External Treatment-free Polymer Solar Cells with Poly（3-hexylthiophene） as Donor

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Chemical Research in Chinese Universities 2015年第5期31卷 865-872页

作者： XUE Rongming ZHAO Yue XU Guiying li Yaowen li yongfang Laboratory of Advanced Optoelectronic Materials College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 P R. China Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 P R. China Beijing National Laboratory for Molecular Sciences Institution of Chemistry Chinese Academy of Sciences Beijing 100190 P R. China

A series oftri（alkoxyl）benzene-fullerene dyads（PCBB-Cn, n=4, 6, 8, 10, 12） with varied tri（alkoxyl） chain lengths was designed, synthesized and used as acceptor materials in polymer solar cells（PSCs）. The five fullerene dyads possess similar absorption spectra in dilute solution, decreased glass-transition temperature（Tg） and gradually elevated lowest unoccupied molecular orbital（LUMO） energy levels from -3.87 eV to -3.73 eV with the increase of the alkoxy chain length. In the fabrication of PSCs with poly（3-hexylthiophene）（P3HT） as donor and the fullerene dyads as acceptor, PCBB-Cn with longer tri（alkoxyl） chains and lower Tg can induce crystalline structure of P3HT during spin-coating the photoactive layer at room temperature and form nanoscale phase separated interpenetrating network of P3HT：PCBB-Cn blend films, which results in the improvement of photovoltaic performance of PSCs. A power conversion efficiency of 3.03% for the PSCs based on P3HT：PCBB-C10 was obtained without thermal annealing or solvent annealing. The thermal and solvent annealing-free fabrication using the fullerene dyads as acceptor is very important for the roll to roll production of PSCs with flexible large area.

关键词： Polymer solar cell Induced crystalline Fullerene dyad

Large-area flexible organic solar cells

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npj Flexible Electronics 2021年第1期5卷 264-275页

作者： Fu Yang Yuting Huang Yaowen li yongfang li Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190China

Two major challenges need to be overcome to bridge the efficiency gap between small-area rigid organic solar cells(OSCs)and large-area flexible devices:the first challenge lies in preparing high-quality flexible transparent electrodes with low resistance,high transparency,smooth surface,and superior mechanical ***,the scalable fabrication of thickness-insensitive photoactive layers with low-cost materials is also an essential *** this review,recent progress and challenges of flexible largearea OSCs are summarized and *** on our analysis,strategies and opportunities are proposed to promote the development of stable and efficient flexible large-area OSCs.

关键词： properties preparing transparency

Uric acid lowering effect of Tibetan Medicine RuPeng15 powder in animal models of hyperuricemia

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Journal of Traditional Chinese Medicine 2016年第2期36卷 205-210页

作者： Kou Yiying li yongfang Ma Husai li Wangyu li Ruilian Dang Zhancui Department of Pharmacology Medical College of Qinghai University Xining 810001 China Public Health Department of Medical College of Qinghai University Xining 810001 China Department of Surgery Qinghai Red Cross Hospital Xining 810000 China Gastroenterology Department of Qinghai Red Cross Hospital Xining 810001 China

OBJECTIVE: To evaluate the influence of the Tibetan medicine Ru Peng15 powder(RPP15) on uric acid levels, and explore its possible mechanisms of action in hyperuricemic animal ***: Hyperuricemic mice were generated by orally administering yeast extract paste twice daily(30 g/kg) for 8 days, to mimic human hyperuricemia induced by high-protein diets. Hyperuricemic rats were generated by intraperitoneal injection of 250 mg/kg potassium oxonate to each animal 1 h before the last oral administration of test compounds, which raised the serum uric acid level by inhibiting the decomposition of uric acid. Levels of uric acid and creatinine in serum and urine were detected by the phosphotungstic acid and picric acid methods respectively, and the activity of xanthine oxidase(XOD) was assayed using a commercial test ***: RPP15(0.4, 0.8, 1.2 g/kg) significantly decreased the level of serum uric acid in healthy rats(P liver was restored to normal levels after treatment with RPP15(P likely associated with inhibiting the activity of XOD.

关键词：尿酸血症动物模型藏药黄嘌呤氧化酶活性测定腹腔注射苦味酸法 XOD

Red-emission organic light-emitting diodes based on solution-processable molecules with triphenylamine core and benzothiadiazole-thiophene arms

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Science China Chemistry 2011年第4期54卷 695-698页

作者： ZHANG Jing YANG Yi HE Chang li yongfang Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China

We report red-emission organic light-emitting diodes (OLEDs) based on solution-processable organic molecules with triphenylamine (TPA) as core and benzothiadiazole-(4-hexyl)thiophene (BT-4HT) as ***-armed molecule B(TPA-BT-4HT) and star-shaped (tri-armed) molecule S(TPA-BT-4HT) both show pure red-emission peaked at 646 and 657 nm,*** red-emission OLED with S(TPA-BT-4HT) as the emitting layer displays a higher maximum luminance of ca.7794 cd/m2 and a maximum EL efficiency of 0.91 cd/A.

关键词：有机发光二极管分子二极管发射波长三苯胺武器噻吩对苯二甲酸 OLEDs

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面向产业化的全钙钛矿叠层光伏组件

化学进展 2022年第6期34卷 1247-1248页

作者：孟磊李永舫中国科学院化学研究所有机固体院重点实验室北京100190

全钙钛矿叠层太阳电池具有低成本溶液处理的优势,在薄膜太阳能电池的大规模应用中显示出重要前景。此前,南京大学谭海仁课题组通过旋涂技术制备的小面积全钙钛矿叠层太阳电池的认证效率达到26.4%。近日,南京大学谭海仁课题组在Science... 详细信息

全钙钛矿叠层太阳电池具有低成本溶液处理的优势,在薄膜太阳能电池的大规模应用中显示出重要前景。此前,南京大学谭海仁课题组通过旋涂技术制备的小面积全钙钛矿叠层太阳电池的认证效率达到26.4%。近日,南京大学谭海仁课题组在Science期刊上发表了运用涂布印刷、真空沉积等大面积制备技术,首次实现全钙钛矿叠层光伏组件的制备。

关键词：薄膜太阳能电池叠层太阳电池光伏组件南京大学钙钛矿真空沉积溶液处理大规模应用

Fine-tuning HOMO energy levels between PM6 and PBDB-T polymer donors via ternary copolymerization

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Science China Chemistry 2020年第9期63卷 1256-1261页

作者： Xiaojun li Ruijie Ma Tao liu Yiqun Xiao Gaoda Chai Xinhui Lu He Yan yongfang li Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration&Reconstruction Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Hong Kong University of Science and Technology-Shenzhen Research Institute Shenzhen 518057China Department of Physics Chinese University of Hong KongNew TerritoriesHong KongChina Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Laboratory of Advanced Optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

To achieve high-efficiency polymer solar cells(PSCs),it is not only important to develop high-performance small molecule acceptors(SMAs)but also to find a matching polymer donor to achieve optimal morphology and matching electronic ***,state-of-the-art SMAs mostly rely on a donor polymer named ***,as the family of SMAs continues to expend,PM6 may not be the perfect polymer donor due to the requirement of energy level *** this work,we tune the energy level of PM6 via the strategy of ternary *** achieve two donor polymers(named PL-1 and PL-2)with upshifted HOMO(the highest occupied molecular orbital)energy level(compared with PM6),and can thus match with the SMAs with upshifted HOMO energy levels compared with *** two copolymers exhibit slightly higher order of molecular packing and similar charge transport properties,which demonstrate that the method of ternary copolymerization can fine tune the HOMO level of donor polymers,while the morphology and mobility of the blend film remain mostly *** them,the best device based on PL-1:Y6 exhibits power conversion efficiencies(PCEs)of 16.37%with lower open circuit voltage(Voc)but higher short circuit current voltage(Jsc)and fill factor(FF)than that of the device based on PM6:*** work provides an effective approach to find polymer matches for the SMAs with upshifted HOMO levels.

关键词： polymer solar cells polymer donors random ternary copolymers tuning energy levels higher HOMO level acceptors