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Light(Science & Applications) 2020年第1期9卷 1723-1730页

作者： Chenglong Li Hailu Wang Fang Wang Tengfei Li Mengjian Xu Hao Wang Zhen Wang xiaowei zhan Weida Hu Liang Shen State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin University2699 Qianjin StreetChangchun 130012China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of Sciences500 Yutian RoadShanghai 200083China University of Chinese Academy of Sciences Beijing 100049China Department of Materials Science and Engineering College of EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationPeking UniversityBeijing 100871China

Organic-inorganic hybrid perovskite(OIHP)photodetectors that simultaneously achieve an ultrafast response and high sensitivity in the near-infrared(NIR)region are prerequisites for expanding current monitoring,imaging,and optical communication ***,we demonstrate photodetectors constructed by OIHP and an organic bulk heterojunction(BHJ)consisting of a low-bandgap nonfullerene and polymer,which achieve broadband response spectra up to 1μm with a highest external quantum efficiency of approximately 54%at 850 nm,an ultrafast response speed of 5.6 ns and a linear dynamic range(LDR)of 191 *** sensitivity,ultrafast speed and a large LDR are preeminent prerequisites for the practical application of ***,due to the high-dynamicrange imaging capacity,high-quality visible-NIR actual imaging is achieved by employing the OIHP *** believe that state-of-the-art OIHP photodetectors can accelerate the translation of solution-processed photodetector applications from the laboratory to the imaging market.

关键词： heterojunction dynamic photodetector

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

Modulating morphology via side-chain engineering of fused ring electron acceptors for high performance organic solar cells

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Science China Chemistry 2019年第6期62卷 790-796页

作者： Fuwen Zhao Dan He Jingming Xin Shuixing Dai Han Xue Li Jiang Zhixiang Wei Wei Ma xiaowei zhan Yongfang Li Chunru Wang Institute of Chemistry Chinese Academy of Sciences State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Department of Materials Science and Engineering College of Engineering Peking University National Center for Nanoscience and Technology

In this work, four fused ring electron acceptors(FREAs), 2F-C5, 2F-C6, 2F-C8 and 2F-C10, are developed to investigate the effect of side-chain size on the molecular properties and photovoltaic performance of FREA systematically. The elongation of side-chains in the FREAs not only improves their solubility in the processing solvent, but also enhances their miscibility with the donor PBDB-T. It helps the FREA diffuse into the donor PBDB-T during film-formation, thus leading to the decrease in domain size and domain purity from PBDB-T:2F-C5 to PBDB-T:2F-C10 blend films in sequence. The smaller domain size affords more D/A interfaces to benefit exciton dissociation and inhibit monomolecular recombination. However, severe bimolecular recombination occurs when the domain purity decreases to a critical point. Due to the dual function of the increment of side-chain length, both short-circuit current density(J_(SC)) and fill factor(FF) of devices exhibit an evolution of first increasing then decreasing from 2F-C5, 2F-C6, 2F-C8 to 2F-C10 based OSCs. The PBDB-T:2F-C8 based OSCs get a fine balance in morphology with moderate domain size as well as high domain purity simultaneously for the least charge carrier recombination, thus achieving the highest power conversion efficiency of 12.28% with the best J_(SC)(21.27 mA cm^(-2)) and FF(71.96%).

关键词： solar cells fused ring electron acceptor side-chain length morphology

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

Enhancing the Goos-Hänchen shift based on quasi-bound states in the continuum through material asymmetric dielectric compound gratings

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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 ***,symmetry-protected QBIC resonance is often achieved by breaking the geometric symmetry,but few cases are achieved by breaking the material *** paper proposes a dielectric compound grating to achieve a high Q factor and high-reflection symmetry-protectede QBIC resonance based on material *** 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 *** 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

DESIGN OF EFFICIENT FUSED-RING ELECTRON ACCEPTOR PHOTOVOLTAIC MATERIALS

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DESIGN OF EFFICIENT FUSED-RING ELECTRON ACCEPTOR PHOTOVOLTAI...

FUSED-RING ELECTRON ACCEPTOR PHOTOVOLTAIC MATERIALS

2016年两岸三地高分子液晶态与超分子有序结构学术研讨会（暨第十四届全国高分子液晶态与超分子有序结构学术论文报告会）

作者： xiaowei zhan Department of Materials Science and Engineering College of Engineering Peking University

Organic photovoltaic materials consist of electron donors and electron *** the past years,fullerenes and their derivatives have been the dominant electron acceptor materials in organic solar cells(OSCs).As fullerene a... 详细信息

关键词： DESIGN OF EFFICIENT FUSED-RING ELECTRON ACCEPTOR PHOTOVOLTAIC MATERIALS

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FUSED-RING ELECTRON ACCEPTOR PHOTOVOLTAIC MATERIALS

Rhodanine flanked indacenodithiophene as non-fullerene acceptor for efficient polymer solar cells

2018年海峡两岸暨港澳高分子液晶态与超分子有序结构学术研讨会（暨第十五届全国高分子液晶态与超分子有序结构学术论文报告会）

作者： xiaowei zhan Department of Materials Science and Engineering College of EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationPeking University

We firstly proposed the concept of "fused-ring electron acceptor(FREA)", and designed and synthesized a series of FREAs. These FREAs present some advantages: 1) They have high electron mobilities similar to those of fullerenes;2) They exhibit strong and broad absorption, especially in the 700–1000 nm range, and can match with wide-bandgap donor materials to achieve complementary absorption;3) Their energy levels can be tuned and thus match with various high-performance electron donors;4) Their crystallinity and film morphology can be tuned

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Science China Chemistry 2017年第2期60卷 257-263页

作者： Boyu Jia Yao Wu Fuwen Zhao Cenqi Yan Siya Zhu Pei Cheng Jiangquan Mai Tsz-Ki Lau Xinhui Lu Chun-Jen Su Chunru Wang xiaowei zhan Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Department of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing 100871China Institute of Chemistry Chinese Academy of SciencesBeijing 100190China Department of Physics Chinese University of Hong KongNew TerritoriesHong KongChina National Synchrotron Radiation Research Center Taiwan 30076China

A fused-ring electron acceptor IDT-2BR1 based on indacenodithiophene core with hexyl side-chains flanked by benzothiadiazole rhodanine was designed and *** comparison with its counterpart with hexylphenyl side-chains(IDT-2BR),IDT-2BR1exhibits higher highest occupied molecular orbital(HOMO)energy but similar lowest unoccupied molecular orbital(LUMO)energy(IDT-2BR1:HOMO=-5.37eV,LUMO=-3.67eV;IDT-2BR:HOMO=-5.52eV,LUMO=-3.69eV),red-shifted absorption and narrower ***-2BR1 has higher electron mobility(2.2×10^(-3)cm^2 V^(-1)s^(-1))than IDT-2BR(3.4×10^(-4)cm^2 V^(-1)s^(-1))due to the reduced steric hindrance and ordered molecular ***-free organic solar cells based on PTB7-Th:IDT-2BRl yield power conversion efficiencies up to 8.7%,higher than that of PTB7-Th:IDT-2BR(7.7%),with a high open circuit voltage of0.95 V and good device stability.

关键词： organic solar cell non-fullerene acceptor fused-ring electron acceptor indacenodithiophene rhodanine

The Determinants of Capital Flight： Empirical Evidence from 1982 to 2004 in China

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Chinese Business Review 2006年第6期5卷 38-43页

作者： Weiguo Xiaq Bing Shao xiaowei zhan Wuhan University China Bank Regulatory Commission Anhui Office China Development Bank Anhui Branch

This study presents the possible determinants of capital flight in China. We present a Johansen cointegration model based on the dynamic econometric theory. By the co-integration model, we get appropriate long-term relationship between capital and its determinants. The empirical results imply that the difference between domestic and foreign interest rate, the foreign debt as a percentage of GDP, the overvaluation of the exchange rate, the discrimination between native and foreign capital, financial control is the main economic forcing factors of capital flight.

关键词： capital flight determinants empirical analysis

Enhancing photovoltaic performance via aggregation dynamics control in fused-ring electron acceptor

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Aggregate

Aggregate 2021年第3期2卷 1-8页

作者： Jiayu Wang Runyu Zhu Shijie Wang Yawen Li Boyu Jia Jiadong Zhou Peiyao Xue Susanne Seibt Yuze Lin Zengqi Xie Wei Ma xiaowei zhan Department of Materials Science and Engineering College of EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationPeking UniversityBeijingChina State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’anChina Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijingChina Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhouChina Australian Synchrotron ClaytonVictoriaAustralia

A new fused-ring electron acceptor FNIC3 with dynamics controlled aggregation behavior was ***3 shows strong absorption in 600–900 nm,HOMO/LUMO energy levels of−5.59/−4.04 eV,and electron mobility of 1.2×10^(−3) cm^(2) V^(−1) s^(−1).The aggregation of FNIC3 shows strong dependency on film formation *** of film formation time promotes the crystallization of FNIC3,leading to improved crystallinity and enlarged aggregate *** of FNIC3 significantly influences the photovoltaic device *** aggregation red-shifts the absorption and improves the mobilities of the blend,which contributes to high photocurrent and fill factor thus high power conversion efficiency(PCE).Overaggregation leads to increased nonradiative energy loss and insufficient charge generation,resulting in decreased open-circuit voltage and short-circuit current *** blends based on PM6:FNIC3 fabricated under proper film formation time exhibit a PCE of 12.3%,higher than those fabricated under short and long film formation time(10.0–10.5%).

关键词： aggregation dynamics fused-ring electron acceptor nonfullerene acceptor organic solar cell