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化学物理学报(英文) 2023年第5期36卷 503-508,I0001页

作者： Ruixiang Wu Xin Liu Xiaoshuai Wang Jingjing Luo Bin Li Shengzhi Wang Xiangyang Miao Key Laboratory of Spectral Measurement and Analysis of Shanxi Province College of Physics and Information EngineeringShanxi Normal UniversityTaiyuan 030031China

Zero-dimensional environmentally friendly carbon quantum dots(CQDs)combined with two-di-mensional materials have a wide range of applications in optoelec-tronic *** combined steady-state and transient absorp-tion spectroscopies to study the energy transfer dynamics between CQDs and molybdenum disulfide(MoS_(2)).transient absorption plots showed photoinduced absorption and stimulated emission features,which involved the intrinsic and defect states of *** MoS_(2)to CQDs solution,the lowest unoccupied molecular orbital of CQDs transferred energy to MoS_(2),which quenched the intrinsic emission at 390 *** addition of MoS_(2),CQD-MoS_(2)composites quenched defect emission at 490 nm and upward absorption,which originated from another energy transfer from the defect *** energy transfer paths between CQDs and MoS_(2)were efficiently manipulated by changing the concentration of MoS_(2),which laid a foundation for improving device performance.

关键词： Energy transfer transient absorption spectroscopy Carbon quantum dot Molybdenum disulfide

Investigation of charge transfer between donor and acceptor for small-molecule organic solar cells by scanning tunneling microscopy and ultrafast transient absorption spectroscopy

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Nano Research 2022年第9期15卷 8019-8027页

作者： Yuchuan Xiao Linxiu Cheng Xinyu Sui Qi Wang Jie Chen Dan Deng Jianqi Zhang Xuan Peng Xiaokang Li Xunwen Xiao Ke Deng Xinfeng Liu Zhixiang Wei Qingdao Zeng CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology(NCNST)Beijing 100190China Jiangxi Provincial Key Laboratory of Low-Carbon Solid Waste Recycling School of Geography and Environmental EngineeringGannan Normal UniversityGanzhou 341000China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China College of Chemistry and Chemical Engineering Gannan Normal UniversityGanzhou 341000China School of Materials and Chemical Engineering Ningbo University of TechnologyNingbo 315211China

Small-molecule organic solar cell is a category of clean energy potential device since charge transfers between donor and *** morphologies,co-assembly behavior,interaction sites,and charge transfer of BTID-nF(n=1,2)/PC71BM donor-acceptor system in the active layer of organic solar cell have been studied employing scanning tunneling microscopy(STM),scanning tunneling spectroscopy(STS),density functional theory(DFT)calculations,and transient absorption(TA)*** results show that BTID-1F and BTID-2F form bright strip structures,whereas BTID-nF(n=1,2)/PC71BM form ridge-like structures with each complex composed of one BTID-nF(n=1,2)molecule and four PC71BM molecules which adsorbed around the BTID-nF(n=1,2)molecule by S···π*** the assistance of S···πinteraction between BTID-nF(n=1,2)and PC71BM,BTID-nF(n=1,2)/PC71BM co-assembled ridge-like structures are more stable than the BTID-nF(n=1,2)ridge *** investigate the charge transfer of BTID-nF(n=1,2)/PC71BM system,STS measurements,DFT calculation,and TA spectroscopy are further *** results show that charge transfer occurs in BTID-nF(n=1,2)/PC71BM system with the electron transferring from BTID-nF(n=1,2)molecules to PC71BM.

关键词： organic solar cells scanning tunneling microscopy transient absorption spectroscopy charge transfer donor-acceptor system

Probing the ultrafast dynamics in nanomaterial complex systems by femtosecond transient absorption spectroscopy

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High Power Laser Science and Engineering 2016年第3期4卷 13-22页

作者： Qun Zhang Yi Luo Hefei National Laboratory for Physical Sciences at the Microscale Department of Chemical Physics and Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China

Over the past decade the integration of ultrafast spectroscopy with nanoscience has greatly propelled the development of nanoscience, as the key information gleaned from the mechanistic studies with the assistance of ultrafast spectroscopy enables a deeper understanding of the structure–function interplay and various interactions involved in the *** mini-review presents an overview of the recent advances achieved in our ultrafast spectroscopy laboratory that address the ultrafast dynamics and related mechanisms in several representative nanomaterial complex systems by means of femtosecond time-resolved transient absorption spectroscopy. We attempt to convey instructive, consistent information regarding the important processes, pathways, dynamics, and interactions involved in the nanomaterial complex systems,most of which exhibit excellent performance in photocatalysis.

关键词： nanomaterials time-resolved femtosecond pump-probe transient absorption spectroscopy ultrafast dynamics

Hidden Relaxation Channels in Aqueous Methylene Blue after Functionalization of Graphene Oxide Probed by transient absorption spectroscopy

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Chinese Journal of Chemical Physics 2017年第4期30卷 389-394,I0001页

作者：柯达隋来志刘敦利王禹苏李苏宇姜远飞陈安民金明星吉林大学原子与分子物理研究所长春130012 吉林省应用原子与分子光谱学重点实验室长春130012

The mixture of graphene oxide （GO） and dye molecules may provide some new applications due to unique electronic, optical, and structural properties. Methylene blue （MB）, a typ- ical anionic dye, can attach on GO via π-π stacking and electrostatic interaction, and the molecule removal process on GO has been observed. However, it remains unclear about the ultrafast carrier dynamics and the internal energy transfer pathways of the system which is composed of GO and MB. We have employed ultrafast optical pump-probe spectroscopy to investigate the excited dynamics of the GO-MB system dispersed in water by exciting the samples at 400 nm pump pulse. The pristine MB and GO dynamics are also analyzed in tandem for a direct comparison. Utilizing the global analysis to fit the measured signal via a sequential model, five lifetimes are acquired：（0.61±0.01） ps, （3.52±0.04） ps, （14.1±0.3） ps, （84±2） ps, and （3.66±0.08） ns. The ultrafast dynamics corresponding to these lifetimes was analyzed and the new relaxation processes were found in the GO-MB system, compared with the pristine MB. The results reveal that the functionalization of GO can alter the known decay pathways of MB via the energy transfer from GO to MB in system, the increased intermediate state, and the promoted energy transfer from triplet state MB to ground state oxygen molecules dissolved in aqueous sample.

关键词： transient absorption spectroscopy Methylene blue Functionalization of graphene oxide Relaxation channels

Ultrafast dynamics of trans-4-diethylaminoazobenzene studied by femtosecond transient absorption spectroscopy

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Ultrafast dynamics of trans-4-diethylaminoazobenzene studied...

Ultrafast Photophysics in Dibenzo Compounds by transient absorption spectroscopy

中国化学会第29届学术年会

作者： Ya-ping Wang Song Zhang Si-mei Sun Kai Liu Bing Zhang State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences

The ultrafast excited state dynamics of trans-4-diethylaminoazobenzene with the S2 state excitation was investigated in several solvents by femtosecond transient absorption spectroscopy. Following excitation to the S2 state, the internal conversion to the S1 state was observed within 70 fs. The decay of the S1 state includes isomerization to the hot S0 state of cis isomer and internal conversion to the hot S0 state of trans isomer. Solvent effect was observed in the decay of the S1 state of trans isomer and the vibration relaxation of the hot S0 state of cis isomer. The lack of solvent viscosity dependence of the S1-state lifetime indicates that the photoisomerization is not by rotation mechanism but by inversion mechanism. The S1-state lifetime is slower with the increase of solvent polarity, since the energy gap between the S0 and S1 state is larger. The vibrational cooling of the hot S0 state of cis isomer is faster in protic solvents since the H-bond was formed.

关键词： trans-4-diethylaminoazobenzene photoisomerization transient absorption spectroscopy solvent effect ultrafast dynamics

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Ultrafast Photophysics in Dibenzo Compounds by Transient Abs...

Photoinduced excimer generation in perylene diimide dimer:effects of solvent polarity[Invited]

第十三届全国化学动力学会议

作者： Song Zhang Kai Liu Yaping Wang Bing Zhang State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy

＜正＞If the photo-excited state is a singlet 1 ππ* state the ISC will be efficient provided that a triplet 3 nπ* state is energetically accessible. In aromatic dibenzo compounds such a situation prevails and they ... 详细信息

关键词： Dibenzo Compounds transient absorption spectroscopy nonradiative deactivation

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Chinese Optics Letters 2022年第10期20卷 49-54页

作者： Guangliu Ran Hang Wang Yujing Song Yahui Liu Zhishan Bo Wenkai Zhang Department of Physics and Applied Optics Beijing Area Major Laboratory Center for Advanced Quantum StudiesBeijing Normal UniversityBeijing 100875China College of Textiles&Clothing Qingdao UniversityQingdao 266071China Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China

The aggregation and photoinduced excited state dynamics of organic π-conjugated molecules play a vital role in solar energy conversion and *** work investigates how solvent polarity affects the aggregation behavior and the photophysical process of perylene diimide dimer(PDI-II).The results show that the conjugations between PDI intramolecular chromophores are more likely to generate excimer,and the conjugations between PDI intermolecular chromophores are more likely to experience symmetry-breaking charge *** study can provide a reference for the design of high-efficiency solar energy conversion materials.

关键词： excimer perylene diimide dimer solvent effect transient absorption spectroscopy

Unraveling the influence of interface defects on antimony trisulfide solar cells

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Journal of Energy Chemistry 2023年第3期78卷 262-267,I0008页

作者： Hongyi Chen Cheng Wang Shaoying Wang Ruiming Li Yan Zeng Zhe Li Zhengwei Ou Qianqian Lin Jianmin Li Ti Wang Hongxing Xu School of Physics and Technology and Key Laboratory of Artiﬁcial Micro-and Nano-structures of Ministry of EducationWuhan UniversityWuhan 430072HubeiChina Wuhan Institute of Quantum Technology Wuhan 430206HubeiChina School of Microelectronics Wuhan UniversityWuhan 430072HubeiChina

Antimony trisulfide(Sb_(2)S_(3)) solar cells suffer from large open circuit voltage deficits due to their intrinsic defects which limit the power conversion ***,it is important to elucidate these defects’ origin and defects at the ***,we discover that sulfide radical defects have a significant impact on the performance of Sb_(2)S_(3)solar ***,it has been illustrated that these defects at the CdS/Sb_(2)S_(3)interface can be reduced by optimizing the deposition process.A trap distribution model is used to quantify the defect density at the CdS/Sb_(2)S_(3)*** shows that the interface defects can be reduced by24% by improving the deposition *** work reveals the importance of interface defects and guides the future optimization of Sb_(2)S_(3)solar cells.

关键词： Antimony trisulﬁde Interface defect transient absorption spectroscopy

Electron transfer dynamics in Schottky junction photocatalyst during electron donor-assisted hydrogen production

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Journal of Materials Science & Technology 2023年第28期159卷 1-9页

作者： Jianjun Zhang Jingjing Liu Zheng Meng Sanjib Jana Linxi Wang Bicheng Zhu Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of Geosciences68 Jincheng StreetWuhan 430078China School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological University21 Nanyang LinkSingapore 637371Singapore Jiangxi Key Laboratory of Surface Engineering Jiangxi Science and Technology Normal UniversityNanchang 330038China

Electron donors(EDs)are widely used to improve the H 2 production performance of Schottky junction photocatalysts,but the functions of EDs are still unknown from the perspective of electron transfer ***,Pt nanocluster-decorated CdS nanorod is successfully prepared to construct a typical CdS/Pt Schottky *** nanoclusters with a diameter of∼2 nm are deposited on the surface of CdS nanorods by in situ photoreduction at sub-zero *** CdS/Pt photocatalyst using lactic acid shows a higher H_(2)production rate of 4762μmol g^(-1)h^(-1)compared to that using methanol,tri-ethanolamine,and *** understand the cause,the dynamics of photogenerated carriers in CdS/Pt photocatalysts during ED-assisted H_(2)production are revealed by femtosecond transient absorption *** the four organic EDs,lactic acid enables the fastest electron transfer rate of 1.8×10^(9)s^(-1)and the highest electron transfer efficiency of 76%at the CdS/Pt interface due to the most efficient hole *** work sheds light on the importance of efficient interfacial electron transfer for im-proving the photocatalytic performance of Schottky junction photocatalysts.

关键词： transient absorption spectroscopy Interfacial electron transfer Electron transfer rate Electron transfer efficiency Hole consumption

Molecular stacking controlling coherent and incoherent singlet fission in polymorph rubrene single crystals Special Issue:Emerging Investigators

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Aggregate 2023年第5期4卷 137-144页

作者： Yanping Liu Xuexiao Yang Lei Ye Haibo Ma Haiming Zhu State Key Laboratory of Modern Optical Instrumentation Key Laboratory of Excited-State Materials of Zhejiang ProvinceDepartment of ChemistryZhejiang UniversityHangzhouChina School of Chemistry and Chemical Engineering Nanjing UniversityNanjingChina ZJU-Hangzhou Global Scientific and Technological Innovation Center HangzhouChina

Singlet fission(SF)is an appealing process where one photoexcited singlet transforms to two triplets,which can overcome thermalization energy loss and improve solar cell ***,it remains unclear how intermolecular coupling,which is subject to molecular stacking,controls SF pathways and ***,we prepared polymorph rubrene single crystals with different stacking geometries,including orthorhombic(Orth.),triclinic(Tri.),and monoclinic(Mono.)*** micro-area ultrafast spectroscopy,we find that *** *** with closerπ-πstacking exhibit co-existing coherent and incoherent SF channels while loosely stacked *** shows only incoherent ***,incoherent SF is thermally activated in *** barrierless in *** *** mechanical calculation reveals that different electronic coupling strength in different phases leads to different SF *** study demonstrates that molecular stacking governs SF dynamics through electronic coupling,providing guidance for designing efficient SF materials via crystal structural engineering.

关键词： electronic couplings rubrene singlet fission transient absorption spectroscopy triplet pair