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Chinese Physics B 2024年第3期33卷 393-400页

作者：江孝伟方彬占春连 College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018China College of Information Engineering Quzhou College of TechnologyQuzhou 324000China

Quasi-bound state in the continuum(QBIC)resonance is gradually attracting attention and being applied in Goos-Hänchen(GH)shift enhancement due to its high quality(Q)factor and superior optical confinement.Currently,symmetry-protected QBIC resonance is often achieved by breaking the geometric symmetry,but few cases are achieved by breaking the material symmetry.This paper proposes a dielectric compound grating to achieve a high Q factor and high-reflection symmetry-protectede QBIC resonance based on material asymmetry.Theoretical calculations show that the symmetry-protected QBIC resonance achieved by material asymmetry can significantly increase the GH shift up to-980 times the resonance wavelength,and the maximum GH shift is located at the reflection peak with unity reflectance.This paper provides a theoretical basis for designing and fabricating high-performance GH shift tunable metasurfaces/dielectric gratings in the future.

关键词： bound state in the continuum Goos-Hänchen shift dielectric compound grating material asymmetry

Effects of Thieno[3,2-b]thiophene Number on Narrow-Bandgap Fused-Ring Electron Acceptors

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Chinese Journal of Polymer Science 2022年第8期40卷 914-920,I0008页

作者： Tengfei Li Guilong Cai Yuze Lin Xinhui Lu xiaowei zhan Key Laboratory of Polymer Chemistry and Physics of Ministry of Education School of Materials Science and EngineeringPeking UniversityBeijing100871China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing100190China Department of Physics The Chinese University of Hong KongHong Kong999077China

We synthesize and compare four near-infrared absorbing fused-ring electron acceptors named as nTTIC(n=2,3,4,and 5),based on different number of thieno[3,2-b]thiophene(TT)unit as the electron-donating core.With increasing the TT unit,absorption spectrum of the TTIC series red shifts,and the highest occupied molecular orbital(HOMO)upshifts notably.It is worth noting that 4TTIC and 5TTIC exhibit absorption edges approaching 1100 nm,which is the photoresponse limit of solar cells based on crystal silicon.When the TTIC series acceptors are blended with polymer donor PM6,the binary-blend organic solar cells based on 3TTIC show the best power conversion efficiency(PCE)of 13.1%.In contrast,2TTIC-based devices exhibit relatively lower PCE of 8.32%,mainly caused by the larger energy loss and blue-shifted absorption.Due to insufficient driving force of charge separation caused by very high HOMO,4TTIC and 5TTIC show poor PCEs lower than 3%.

关键词： Thieno[3,2-b]thiophene Near-infrared absorption Fused-ring electron acceptor Nonfullerene Organic solar cell

Perylene Diimide-Based Oligomers and Polymers for Organic Optoelectronics

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Accounts of Materials Research 2022年第3期3卷 309-318页

作者： Pei Cheng Xingang Zhao xiaowei zhan Key Laboratory of Polymer Chemistry and Physics of Ministry of Education School of Materials Science and EngineeringPeking UniversityBeijing 100871China College of Polymer Science and Engineering State Key Laboratory of Polymer Material and EngineeringSichuan UniversityChengdu 610065China Key Laboratory of Eco-functional Polymer Materials of Ministry of Education College of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou 730070China

CONSPECTUS:Perylene diimide(PDI)as a classical dye has some advantages,such as structural diversity,tunable optical and electronic properties,strong light absorption,high electron affinity,and good electron-transporting properties and stability.The PDI-based oligomers and polymers are good candidates for n-type semiconductors in organic electronics and photonic devices.A polymer solar cell(PSC)that converts sunlight into electricity is a promising renewable and clean energy technology and has some superiorities,such as simple preparation and being lightweight,low cost,semitransparent,and flexible.For a long time,fullerene derivatives(e.g.,PCBM)have been the most important electron acceptors used in the active layer of PSCs.However,PCBM suffers from some disadvantages,for example,weak absorption,a large amount of energy loss,and unstable morphology.Compared to PCBM,PDI-based materials present some advantages:intense visible-light absorption;lowest unoccupied molecular orbital(LUMO)energy levels can be modulated to achieve a suitable charge separation driving force and high open-circuit voltage(V_(OC));and the molecular configuration can be adjusted to achieve morphology stability.Thus,PDI-based oligomers and polymers are widely used as electron acceptors in the active layer of PSCs.In addition,PDI-based oligomers and polymers are widely used as n-type semiconductors in other electronic and photonic devices,such as organic field-effect transistors(OFETs),light-emitting diodes,lasers,optical switches,and photodetectors.

关键词： stability absorption separation

From Perylene Dimide Polymers to Fused-Ring Electron Acceptors:A 15-Year Exploration Journey of Nonfullerene Acceptors

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Chinese Journal of Chemistry 2022年第13期40卷 1592-1607页

作者： Jiayu Wang xiaowei zhan Key Laboratory of Polymer Chemistry and Physics of Ministry of Education School of Materials Science and EngineeringPeking UniversityBeijing100871China

Fullerene derivatives are classic electron acceptor materials for organic solar cells (Oscs) but possess some intrinsic drawbacks such as weak visiblelightabsorption,limitedoptoelectronic property tunability,dificult purification and photochemical/morphological instability.Fullereneacceptors area bottleneck restricting further development of this field. Ourgroup pioneered the exploration of novel nonfulerene acceptors in China in 2006,andinitiated the research of two representative acceptor systems, rylene dimide polymer and fused-ring electron acceptor (FREA).FREA breaks the theoreticalefficiencylimit of fullerene-based OsCs (-13%) and promotes the whole field to an unprecedented prosperity with efficiency of 20%, heraldinga nonfullerene era for OsCs.In this review, we revisit 15-year nonfullerene exploration journey,summarize the design principles,molecular engineeringstrategies, physical mechanisms and device applications of these two nonfullerene acceptor systems, and propose some possible researchtopics in the nearfuture.

关键词： Energyconversion Semiconductors Electron-deficient compounds Rylene dimides Fused-ring electron acceptors

Fused-ring electron acceptors in China

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Science China Chemistry 2020年第9期63卷 1179-1181页

作者： Boyu Jia xiaowei zhan Department of Materials Science and Engineering College of EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationPeking UniversityBeijing 100871China

In recent years,organic photovoltaics(OPVs)as one of nextgeneration solar energy technologies have attracted intense interest since they are featured with low cost,light weight,flexibility and semi-transparency[1].At the early stage in the OPV field,fullerenes and their derivatives dominated electron acceptor materials due to their high electron affinity,high electron mobility and isotropic electron transporting ability,and fullerene-based devices yielded power conversion efficiencies(PCEs)up to^12%[2].

关键词： transparency intense acceptor

Enhancing Photovoltaic Performance of Asymmetric Fused-Ring Electron Acceptor by Expanding Pyrrole to Pyrrolo[3,2-b]pyrrole

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Chinese Journal of Chemistry 2022年第24期40卷 2861-2866页

作者： Zemin Wang Guilong Cai Peiyao Xue Zesheng Liu Boyu Jia Nan Li Jiayu Wang Xinhui Lu Yuze Lin Guojie Wang xiaowei zhan School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083 China Key Laboratory of Polymer Chemistry and Physics of Ministry of Education School of Materials Science and EngineeringPeking UniversityBeijing100871 China Department of Physics The Chinese University of Hong KongNew Territories999077 Hong KongChina Chinese Academy of Sciences Beijing National Laboratory for Molecular SciencesCAS Key Laboratory of Organic SolidsInstitute of ChemistryBeijing100190 China

We propose a strategy to improve performance of unidirectionally extended fused-ring electron acceptors by using pyrrolo[3,2-b]pyrrole to replace pyrrole ring, and design two asymmetric nonfullerene acceptors 1PIC and 2PIC. Replacing pyrrole in 1PIC with pyrrolo[3,2-b]pyrrole remarkably red-shifts absorption peak by 109 nm, elevates the HOMO and LUMO energy levels, and improves electron mobility. The photovoltaic devices based on blend of PM6 donor and 2PIC acceptor exhibit power conversion efficiency as high as 12.6%, which is much higher than that of PM6:1PIC (3.53%), due to more efficient exciton generation and dissociation, faster and more balanced carrier transport and less charge recombination.

关键词： Energy conversion Fused-ring electron acceptor Pyrrolo[3,2-b]pyrrole Asymmetric synthesis Semiconductors

Icing on the cake: combining a dual PEG-functionalized pillararene and an A-D-A small molecule photosensitizer for multimodal phototherapy

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Science China Chemistry 2022年第6期65卷 1134-1141页

作者： Bing Lu Zhecheng zhang Yangchaowei Ji Shide Zhou Boyu Jia Yuehua zhang Jin Wang Yue Ding Yang Wang Yong Yao xiaowei zhan College of Chemistry and Chemical Engineering Nantong UniversityNantong226019China School of Materials Science and Engineering Peking UniversityBeijing100871China

The design of photosensitizers with multimodal antitumor activity and the construction of nanocarriers with specific targeting are two magic weapons to achieve highly efficient tumor phototherapy. Here we developed an A-D-A fused-ring conjugated small molecule photosensitizer DPIC and proposed a new strategy of constructing phototherapy agents, namely using supramolecular vesicles constructed by the self-assembly of a novel dual PEG-functionalized pillararene WP5-2 PEG to load DPIC. These new nanocarriers had excellent water solubility and drug encapsulation rates. The prepared DPIC NPs had a better water solubility compared with DPIC molecules and had a uniform hollow spherical morphology, which is beneficial for cell endocytosis. Under laser irradiation(808 nm), the DPIC NPs had a photothermal conversion efficiency(PTCE) of 55% and a PTCE of 49% under980-nm laser irradiation. The DPIC NPs also displayed dual type I and type II photodynamic activity. DPIC NPs had superior biocompatibility and stability and can also inhibit tumor growth in vitro and in vivo, demonstrating their potential for highly efficient cancer phototherapy.

关键词： A-D-A small molecule photosensitizer amphiphilic pillararene supramolecular vesicle photothermal therapy photodynamic therapy

Comparison of conventional and inverted structures in fullerene-free organic solar cells

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Journal of Energy Chemistry 2015年第6期24卷 744-749页

作者： Yifan Wang Huitao Bai xiaowei zhan Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of Sciences University of Chinese Academy of Sciences Department of Materials Science and Engineering College of EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationPeking University

A n-type small molecule DC-IDT2E with 4,4,9,9-tetrakis（4-hexylphenyl）-indaceno[1,2-b：5,6-bt]dithiophene as a central building block, furan as rr-bridges, and 1,1 -dicyanomethylene-3-indanone as end acceptor groups, was synthesized and used as an electron acceptor in solution-processed organic solar cells （OSCs）. DC-IDT2F exhibited good thermal stability, broad and strong absorption in 500-850 rim, a narrow bandgap of 1.54 eV, LUMO of-3.88 eV, HOMO of-5.44 eV and an electron mobility of 6.5 × 10-4 cm2/（V.s）. DC-IDT2F-based OSCs with conventional and inverted structures exhibited power conversion efficiencies of 2.26 and 3.08% respec- tively. The effect of vertical phase separation and morphology of the active layer on the device performance in the two structures was studied.

关键词： Organic solar cells Non-fullerene acceptors Fullerene free Vertical phase separation Inverted structure

Organic dyes based on triphenylamine for dye-sensitized solar cells:Structure–property relationships

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Journal of Energy Chemistry 2016年第4期25卷 615-620页

作者： Huixia Shang Qikai Li Kejian Jiang xiaowei zhan Handan Key Laboratory of Organic Small Molecule Materials Handan University Institute of Chemistry Chinese Academy of Sciences Department of Materials Science and Engineering College of EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationPeking University

Three new organic dyes based on triphenylamine with a structure of A-D-A-D-A (D1), A-D-A (D2) and D-A (D3) were designed, theoretically calculated and synthesized for dye-sensitized solar cells. Dye D1 exhibits a broader absorption than D2 and D3, due to the intramolecular charge transfer between the donor triphenylamine and the acceptor benzothiadiazole. Dye D1 exhibits a lower HOMO and a lower LUMO than D2 and D3 due to the electron-withdrawing benzothiadiazole. The number of anchoring group cyanoacrylic acid has no obvious influence on absorption and energy levels of D2 and D3. The LUMO of D1 locates on benzothiadiazole rather than cyanoacrylic acid anchoring groups, while the LUMOs of D2 and D3 are localized on cyanoacrylic acid. D2 and D3 give higher short-circuit current density than D1. D3 with one anchoring group gives the highest open-circuit voltage. Consequently, the D3-based device gives the highest efficiency. ? 2016 Science Press

关键词： Charge transfer Open circuit voltage Reconfigurable hardware Solar cells

A new perspective for organic solar cells: triplet nonfullerene acceptors

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Science China Chemistry 2018年第6期61卷 637-638页

作者： xiaowei zhan Yongfang Li Department of Materials Science and Engineering College of Engineering Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Peking University Institute of Chemistry Chinese Academy of Sciences

In the last decade,the rapid development of bulk heterojunction(BHJ)organic solar cells(OSCs)has been witnessed and the power conversion efficiencies(PCEs)have reached over 13%[1].Though fullerene derivatives have played dominant roles for BHJ OSCs,nonfullerene acceptors recently showed a promising potential in replacing fullerene derivatives since they possess readily tunable bandgaps,strong and broad absorption,and low cost production[2,3].

关键词：太阳能电池 fullerene 器官字节三位变换效率衍生物 PCE