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Large-area Flexible Organic Solar Cells: Printing Technologies and Modular Design

Chinese Journal of Polymer Science 2022年第12期40卷 1522-1566,I0006页

作者： Xiangchuan Meng Zhi Xing Xiaotian Hu yiwang chen College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry(IPEC) Nanchang UniversityNanchang 330031China Institute of Advanced Scientific Research(iASR)/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal UniversityNanchang 330022China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China

Flexibility is the most prominent advantage of organic solar cells(OSCs) compared with traditional photovoltaic devices, showing an irreplaceable commercial potential. Currently, the maximum power conversion efficiencies(PCEs) of single-junction OSCs have been over 19% and 16% upon rigid and flexible substrates, respectively, which meet the criteria for commercial application. Extensive research efforts are under way, such as device configuration design, interface/photosensitive layer synthesis, transparent electrode modification and printing technology innovation, however, the reasonable selection of printing technologies, the huge performance loss of large-area printing process and the structural design of flexible modules are still the bottlenecks, limiting the commercialization of OSCs. This review focuses on the technical challenges and rational modular configuration design for printing preparation of flexible high-efficiency large-area organic devices, from the aspects of the functional layer material selection, printing process research status and large-scale efficiency losses. These will promote the integrated applications of printable organic semiconductor materials for next-generation clean energy and appeal extensive attentions in wearable electronics, building-integrated photovoltaics and Internet of Things, etc.

关键词： Organic photovoltaic Printing technology Flexible device Modular design

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Bending-stability Interfacial Layer as Dual Electron Transport Layer for Flexible Organic Photovoltaics

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Chinese Journal of Polymer Science 2021年第11期39卷 1441-1448页

作者： Guodong Xu Xiaotian Hu Xunfan Liao yiwang chen Institute of Advanced Scientific Research(iASR) Jiangxi Normal UniversityNanchang 330022China Key Laboratory of Functional Small Molecules for Ministry of Education Jiangxi Normal UniversityNanchang 330022China Analysis and Testing Center Jiangxi Normal UniversityNanchang 330022China Institute of Polymers and Energy Chemistry(IPEC) Nanchang UniversityNanchang 330031China

The flexibility of organic photovoltaics(OPVs)has attracted worldwide attention in recent *** realize the bending-stability of OPVs,it is necessary to put forward the bending-stability of interfacial layer.A novel bendable composite is explored and successfully applied as an electron transport layer(ETL)for fully-flexible *** incorporated poly(vinylpyrrolidone)(PVP)into conjugated electrolytes(CPE)to composite a bendable ETL for high-performance OPVs ***,the devices based on PVP-modified CPE exhibited better device performances and more excellent mechanical properties of *** fullerene-free OPVs based on PM6:IT-4 F with CPE@PVP as ETLs yield the best power conversion efficiency(PCE)of 13.42%.Moreover,a satisfying efficiency of 12.59%has been obtained for the fully-flexible *** far as we know,this is one of the highest PCE for fully-flexible OPV based PM6:IT-4 F *** importantly,the flexible OPVs devices can retain more than 80%of its initial efficiency after 5000 bending ***,among various curvature radii,the mechanical properties of the device based on CPE@PVP are superior to those of the device based on bare CPE as *** findings indicate that the functional flexibility of CPE as a cathode interfacial layer is an effective strategy to fabricate high-performance flexible devices in the near future.

关键词： Bending-stability of interfacial layer Conjugated electrolytes Fully-flexible OPVs Electron transport layers

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Novel Donor-Acceptor Copolymers Based on Dithienosilole and Ketone Modified Thieno[3,4-b]thiophene for Photovoltaic Application

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Chinese Journal of Chemistry 2013年第11期31卷 1455-1462页

作者： Lie chen Shujiao Cai Xianbo Wang yiwang chen lnstitute of Polymers/Department of Chemist~ Nanchang University Nanchang Jiangxi 330031 China jiangxi Provincial Key Laboratory of New Energy Chemistry Nanchang University Nanchang Jiangxi 330031 China

Two novel donor-acceptor （D-A） copolymers containing dithienosilole （DTS） donor unit and ketone modified thieno[3,4-b]thiophene （TT） acceptor unit, namely, poly{4,4＇-bis（2-ethylhexyl）dithieno[3,2-b：2＇,Y-d]silole-5,5＇-diyl- alt-l-（thieno[3,4-b]thiophen-2-yl）-2-ethylhexan-l-one} （PDTSTT） and poly{4,4＇-bis（2-ethylhexyl）dithieno[3,2- b：2＇,3＇-d]silole-5,5＇-diyl-alt- 1-（4,6-bis（4-ethylhexylthien-2-yl）thieno[3,4-b]thiophen-2-yl）-2-ethylhexan- 1-one} （PD- TSDTTT）, were synthesized for the application in polymer solar cells （PSCs）, and the effects of thiophene bridge on the structural geometry and photovoiltaie performance have been investigated. The polymer PDTSTT and PDTSDTTT have the electrochemical bandgaps of 1.54 and 2.02 eV, together with low-lying HOMO energy levels of-5.47 and -5.37 eV, respectively. Molecular geometry simulation result shows that compared with PDTSTT, the insertion of thiophene bridge in PDTSDTTT can well relieve the steric hindrance between the TT and DTS unit, as confirmed by the reduced dihedral angle between DTS and DTTT unit. Under the illumination of AM 1.5G, 100 mW/cm2, the PSC based on PDTSDTTT/PC61BM （1 ： 1, w ： w） demonstrates a power conversion efficiency of 1.0%, which is significantly improved in comparison with the device based on PDTSTT/PC61BM （1 ： 2, w ： w） under the same experimental condition. This is because the enhanced planarity and increased effective conjugation of the main chain in PDTSDTTT promote the more favorable morphology for charge transportation, although PDTSTT possesses the broader absorption band than PDTSDTTT.

关键词： donor-acceptor copolymer molecular geometry photovoltaics

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Mechanical and thermal properties of polypeptide modified hydroxyapatite/poly(L-lactide) nanocomposites

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Science China Chemistry 2011年第3期54卷 431-437页

作者： WEI JunChao DAI YanFeng chen yiwang chen XueSi Department of Chemistry Nanchang University Nanchang 330031 China CAS Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China

A new type of polypeptide(poly(-benzyl-L-glutamate)(PBLG))modified hydroxyapatite(HA)/poly(L-lactide)(PLLA)nanocomposites(PBLG-g-HA/PLLA)were prepared by the solvent-mixing method,and their mechanical and thermal properties were *** tensile test showed that the mechanical properties of PBLG-g-HA/PLLA nanocomposites were better than that of PLLA,even a 0.3 wt%content of PBLG-g-HA in the nanocomposites could make the tensile strength 12%higher than that of the neat PLLA sample,and the tensile modulus was about 17%higher than that of the PLLA *** thermal gravimetric analysis(TGA)showed that the PBLG-g-HA/PLLA composites have better thermal stability than the PLLA *** differential scanning calorimetry(DSC)was used to characterize the effect of PBLG-g-HA on the crystallization of *** isothermal crystallization behavior showed that the half crystallization time(t1/2)of PBLG-g-HA/PLLA was much shorter than that of the PLLA *** the PBLG-g-HA content was 10%,t1/2 was only 18.7 min,while t1/2 of the PLLA sample was 61.4 *** results showed that the PBLG-g-HA worked as a nucleating agent and enhanced the crystallization speed of PLLA.

关键词： hydroxyapatite poly(L-lactide) nanocomposite surface modification

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Alternating Terpolymers Based on Tunable Bi-donors with Manipulating Energy Levels and Molecular Geometry

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Chemical Research in Chinese Universities 2017年第2期33卷 305-311页

作者： chen Zhenzhu YANG Jia WU Feiyan chen Lie chen yiwang College of Chemistry Institute of Polymers Nanchang University Nanchang 330031 P. R. China Jiangxi Provincial Key Laboratory of New Energy Chemistry Nanchang University Nanchang 330031 P. R. China

Three novel regular acceptor-donorl-acceptor-donor2（A-D1-A-D2） terpolymers were prepared via em-bedding a second donor（D2） unit into the traditional D-A backbone to manipulate the energy levels and moleculargeometry with no complex synthesis or solubility loss. In these A-D1-A-D2 terpolymers, benzodithiophene（BDT, D1）and diketopyrrolopyrrole（DPP, A） were selected as the basic skeleton, and the dithienopyrrole（DTPy）, carbazole（CZ）and fluorine（FL） units with different electron donating ability were chosen as the second donor trait（D2）. The HOMOenergy levels can be effectively modulated by only varying D2 unit because of the push-pull interaction between do-nor and acceptor units. Versus the D-A bipolymer PDPP-BDT, incorporation of the D2 unit into the copolymers candistinctly lower the highest occupied molecular orbital（HOMO） levels to -5.47 eV for PDDPP-BDT-DTPy, -5.38 eVfor PDDPP-BDT-CZ and -5.23 eV for PDDPP-BDT-FL, which shows the strong dependence on electron-donatingability. Density functional theory（DFT） simulation and X-ray diffraction（XRD） measurements also reveal the effectof the D2 units on the molecular geometry of the terpolymers and their molecular packing. Notably, aPDDPP-BDT-DTPy combined with a thiophene ring and forked tail pendant away from the backbone had less back-bone torsion and more compact packing than the other two counterparts. These results demonstrate that embedding asecond donor（D2） unit into the backbone to construct an A-D1-A-D2 structure can be an effective and direct strategyto manipulate the energy levels and molecular geometry and develop organic semiconducting materials.

关键词： Terpolymer Electron-donating Energy level Molecular geometry

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Preparation of Perovskite Solar Cells in the Air:Degradation Mechanism and Prospects on Large-Area Fabrication

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Chinese Journal of Chemistry 2023年第5期41卷 599-617页

作者： Shuaishuai Guo Kaikai Liu Li Rao Xiaotian Hu yiwang chen School of Physics and Materials Nanchang University999 Xuefu AvenueNanchangJiangxi 330031China College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry Nanchang University999 Xuefu Avenue NanchangJiangxi330031China Peking University Yangtze Delta Institute of Optoelectronics NantongJiangsu 226010China National Engineering Research Centerfor Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministryof Education Jiangxi Normal University99 Ziyang VenueNanchangJiangxi 330022China

The preparation of perovskite solar cells(PsCs)in the air environment has attracted the attention of numerous experimenters due to its low preparation cost and the possibility of *** the power conversion efficiency(PCE)of PSCs has increased rapidly and exceeded 25%,which is comparable to commercial polysilicon solar cells,most certified or reported high-efficiency perovskite solar cells are still confined to glove boxes or relatively small active areas in the air environment due to moisture,oxygen,high temperature,and ultraviolet(UV)*** this review.

关键词： Perovskite solar cells Degradation mechanism Fabrication in the air Stability strategy Large-area fabrication Thin films Photooxidation

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Enhancing photostability and power conversion efficiency of organic solar cells by a “sunscreen” ternary strategy

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Science China Chemistry 2023年第4期66卷 1179-1189页

作者： Yongjie Cui Zeng chen Peipei Zhu Wei Ma Haiming Zhu Xunfan Liao yiwang chen State Key Laboratory for Modification of Chemical Fibers and Polymer Materials&College of Materials Science and Engineering Donghua UniversityShanghai 201620China National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal UniversityNanchang 330022China Center for Chemistry of High-Performance and Novel Materials Department of ChemistryZhejiang UniversityHangzhou 310027China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049China

The field has witnessed the rapid growth in the power conversion efficiency(PCE)of organic solar cells(OSCs)over the past decade,reaching the threshold for practical ***,a major issue remains that OSC lifetimes are seriously limited by the ultraviolet(UV)-induced ***,inspired by the superior photostability of car paint under sunlight and ambient air,a“sunscreen”molecule,2-(2-hydroxy-5-tert-octylphenyl)benzotriazole(UV329),is used to construct the PM6:Y6 ternary *** addition of UV329 mainly enhances the ordered stacking of PM6 and increases the light utilization of blend films with the improved crystallization and appropriate phase ***,the ternary device exhibits stronger light response and obviously higher and more balanced carrier mobilities,contributing to higher short-circuit current density,fill factor and *** PCE boost is also verified in PM6:BTP-e C9 and PM6:L8-BO *** photodegradation of PM6 dominates the photo-degradation process of PM6:Y6 systems,while the UV329 can effectively suppress such degradation,and thus the ternary device can retain nearly 90%of the initial PCE under continuous illumination for 120 ***,ternary devices also preserve better thermal stability and shelf-life with the enhanced *** work provides a simple yet effective strategy for simultaneously improving PCE and photostability of OSCs.

关键词： ternary strategy sunscreen UV absorber photostability organic solar cells

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Contact Electrification Spectrum for Performance Enhancement Mechanism Investigation of Triboelectric Nanogenerators based on Silicone Elastomers with Different Surface Microstructures

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Chinese Journal of Polymer Science 2023年第10期41卷 1591-1598页

作者： Jianliang Gong Shenyang Ye Yan Luo Liqiong Xia Bingyu Liu yiwang chen National Engineering Research Center for Carbohydrate Synthesis/Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang330022China Institute of Polymers and Energy Chemistry(IPEC)/Jiangxi Provincial Key Laboratory of New Energy Chemistry Nanchang UniversityNanchang330031China

Triboelectric nanogenerators(TENGs)based on conjunctive effects of contact electrification(CE)and electrostatic induction are emerging as a new mechanical energy harvesting and sensing technique for promising applications in smart wearables,Internet of Things(IoTs),*** surface microstructure of a flexible triboelectric material for the increase of surface area is a common strategy for performance enhancement of TENGs,but the real roles of surface microstructures on their output performance are still not explicit due to the lack of suitable analysis tool and rational experimental *** advantages of the surface-sensitive characteristic of CE effect,this work exploited and developed the electric signal patterns generated by single impact of TENGs as a kind of CE spectrum to analyze and speculate the real roles of surface microstructures of flexible triboelectric materials on the output performance of ***,four different kinds of surface microstructures,namely planar surface(PS)and three combinations of two basic surface microstructures,i.e.,micro lens arrays(MLAs),fabric textures(FTs),and hierarchical structures of MLAs on FTs(MLA/FTs),were elaborately designed and introduced for an identical triboelectric material(i.e.,silicone elastomer)by a(micro)molding synthesis *** they were used for assembly of TENGs based on vertical contact mode to conduct performance evaluation under the same triggering *** systematic analysis and comparison of their highly repeatable CE spectra by programmed machine,it was found that the surface microstructure for a flexible triboelectric material to maximally enhance the output performance of a TENG shall achieve a positive synergistic effect of increasing triboelectric charge density,effective contact area and contacting/separating velocity,rather than simple increase of its surface area.

关键词： Contact electrification spectrum Silicone elastomer Surface microstructures Triboelectric nanogenerators Enhancement mechanism

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Novel polymer acceptors achieving 10.18% efficiency for all-polymer solar cells

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Journal of Energy Chemistry 2021年第2期30卷 63-68,I0003页

作者： Shaorong Huang Feiyan Wu Zuoji Liu Yongjie Cui Lie chena yiwang chen College of Chemistry/Institute of Polymers and Energy Chemistry(IPEC) Nanchang University.Nanchang 330031JiangxiChina Institute of Advance Scientific Research(iASR) Jiangxi Normal University99 Ziyang AvenueNanchang 330022JiangxiChina State Key Laboratory for Modification of Chemical Fibers and Polymer Materials&College of Materials Science and Engineering Donghua UniversityShanghai 201620China

Polymer acceptors based on extended fused ring p skeleton has been proven to be promising candidates for all-polymer solar cells(all-PSCs), due to their remarkable improved light absorption than the traditional imide-based polymer acceptors. To expand structural diversity of the polymer acceptors, herein,two polymer acceptors PSF-IDIC and PSi-IDIC with extended fused ring p skeleton are developed by copolymerization of 2,20-((2 Z,20 Z)-((4,4,9,9-tetrahexadecyl-4,9-dihydro-s-indaceno [1,2-b:5,6-b']dithio phene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1 H-indene-2,1-diylidene))dimalononitrile(IDIC-C16) block with sulfur(S) and fluorine(F) functionalized benzodithiophene(BDT) unit and silicon(Si) atom functionalized BDT unit, respectively. Both polymer acceptors exhibit strong light *** PSF-IDIC exhibits similar energy levels and slightly higher absorption coefficient relative to the PSi-IDIC. After blended with the donor polymer PM6, the functional atoms on the polymer acceptors show quite different effect on the device performance. Both of the acceptors deliver a notably high open circuit voltage(V_(OC)) of the devices, but PSi-IDIC achieves higher V OCthan PSF-IDIC. All-PSC based on PM6:PSi-IDIC attains a power conversion efficiency(PCE) of 8.29%, while PM6:PSF-IDIC-based device achieves a much higher PCE of 10.18%, which is one of the highest values for the all-PSCs reported so far. The superior device performance of PM6:PSF-IDIC is attributed to its higher exciton dissociation and charge transport, decreased charge recombination, and optimized morphology than PM6:PSi-IDIC counterpart. These results suggest that optimizing the functional atoms of the side chain provide an effective strategy to develop high performance polymer acceptors for all-PSCs.

关键词： All-polymer solar cells Polymer acceptor Functional atoms Power conversion efficiency

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Ionic Liquid Assisted Imprint for Efficient and Stable Quasi-2D Perovskite Solar Cells with Controlled Phase Distribution

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Nano-Micro Letters 2023年第7期15卷 1-15页

作者： Haibin Peng Dengxue Li Zongcai Li Zhi Xing Xiaotian Hu Ting Hu yiwang chen Department of Polymer Materials and Engineering School of Physics and Materials ScienceNanchang University999 Xuefu AvenueNanchang 330031People’s Republic of China College of Chemistry and Chemical Engineering Institute of Polymers and Energy Chemistry(IPEC)Nanchang University999 Xuefu AvenueNanchang 330031People’s Republic of China National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of EducationJiangxi Normal University99 Ziyang AvenueNanchang 330022People’s Republic of China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010People’s Republic of China

Although two-dimensional perovskite devices are highly stable,they also lead to a number of *** instance,the introduction of large organic amines makes crystallization process complicated,causing problems such as generally small grain size and blocked charge *** this work,imprint assisted with methylamine acetate were used to improve the morphology of the film,optimize the internal phase distribution,and enhance the charge transfer of the perovskite ***,imprint promoted the dispersion of spacer cations in the recrystallization process with the assistance of methylamine acetate,thus inhibited the formation of low-n phase induced by the aggregation of spacer cations and facilitated the formation of 3D-like *** this case,the corresponding quasi-2D perovskite solar cells delivered improved efficiency and exhibited superior *** work provides an effective strategy to obtain uniform phase distribution for quasi-2D perovskite.

关键词： Imprint Two-dimensional perovskite Phase distribution Charge transfer Stability

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