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Influence of donor:acceptor ratio on charge transfer dynamics in non-fullerene organic bulk heterojunctions

Chinese Chemical Letters 2021年第1期32卷 529-534页

作者： Zhenchuan Wen Tong Wang Zhihao Chen Tingting Jiang Lin Feng Xianjin Feng chaochao qin Xiaotao Hao School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJi’nan 250100China School of Physics Henan Normal UniversityXinxiang 453000China Center of Nanoelectronics and School of Microelectronics Shandong UniversityJi’nan 250100China ARC Centre of Excellence in Exciton Science School of ChemistryThe University of MelbourneParkvilleVictoria 3010Australia

The donor:acceptor(D:A) blend ratio plays a very important role in affecting the progress of charge transfer and energy transfer in bulk heterojunction(BHJ) orga nic solar cells(OSCs).The proper D:A blend ratio can provide maximized D/A interfacial area for exciton dissociation and appro p riate domain size of the exciton diffusion length,which is beneficial to obtain high-performance ***,we comprehensively investigated the relationship between various D:A blend ratios and the charge transfer and energy transfer mechanisms in OSCs based on PBDB-T and non-fullerene acceptor *** on various D:A blend ratios,it was found that the ratio of components is a key factor to suppress the formation of triplet states and recombination energy *** D:A blend ratios can provide appropriate donor/accepter surface for charge transfer which has been powerfully verified by various detailed experimental results from the time-resolved fluorescence measurement and transient absorption(TA) *** coherence length and crystallinity are verified by grazing incident wide-angle X-ray scattering(GIWAXS) *** results are bene ficial to comprehend the effects of various D:A blend ratios on charge transfer and energy transfer dynamics and provides constructive suggestions for rationally designing new materials and feedback for photovoltaic performance optimization in non-fullerene OSCs.

关键词： Donor:acceptor ratio Charge transfer dynamics Non-fullerene Organic bulk heterojunctions Organic solar cells

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Tuning coherent phonon dynamics in two-dimensional phenylethylammonium lead bromide perovskites

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Nano Research 2023年第2期16卷 3408-3414页

作者： Minghuan Cui chaochao qin Zhongpo Zhou Yuanzhi Jiang Shichen Zhang Zeye Yuan Mingjian Yuan Kun Yu Yuhai Jiang Yufang Liu Henan Key Laboratory of Infrared Materials&Spectrum Measures and Applications School of PhysicsHenan Normal UniversityXinxiang 453007China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China Center for Transformative Science and School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

Organic-inorganic layered perovskites are two-dimensional quantum well layers in which the layers of lead halide octahedra are stacked between the organic cation *** packing geometry of the soft organic molecules and the stiff ionic crystals induce structural deformation of the inorganic octahedra,generating complex lattice ***,the dielectric confinement and ionic sublattice lead to strong coupling between the photogenerated excitons and the phonons from the polar lattice which intensively affects the properties for device *** anharmonicity and dynamic disorder from the organic cations participate in the relaxation dynamics coupled with ***,a detailed understanding of this underlying mechanism remains *** work investigates the electron–optical phonon coupling dynamics by employing ultrafast pump-probe transient absorption *** activated different optical phonon modes are observed via systematic studies of(PEA)_(2)PbBr_(4) perovskite films on the ultrafast lattice vibrational *** experimental results indicate that solvent engineering has a significant influence on lattice vibrational modes and coherent phonon *** work provides fresh insights into electron-optical phonon coupling for emergent optoelectronics development based on layered perovskites.

关键词： two-dimensional perovskites electron–optical phonon coupling ultrafast dynamics transient absorption

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Suppressing trap states and energy loss by optimizing vertical phase distribution through ternary strategy in organic solar cells

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Science China Chemistry 2021年第4期64卷 599-607页

作者： Pengqing Bi Shaoqing Zhang Tong Xiao Minghuan Cui Zhihao Chen Junzhen Ren chaochao qin Guanghao Lu Xiaotao Hao Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory of Crystal Materials School of PhysicsShandong UniversityJinan 250100China School of Chemistry and Biology Engineering University of Science and Technology BeijingBeijing 100083China Frontier Institute of Science and Technology State Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710054China Department of Physics Henan Normal UniversityXinxiang 453007China

Suppressing the trap-state density and the energy loss via ternary strategy was *** vertical phase distribution with donors(acceptors)accumulated(depleted)at the interface of active layer and charge extraction layer can be obtained by introducing appropriate amount of polymer acceptor N2200 into the systems of PBDB-T:IT-M and PBDB-TF:*** addition,N2200 is gradiently distributed in the vertical direction in the ternary blend *** measurements were carried out to study the effects of N2200 on the binary *** was found that the optimized morphology especially in vertical direction can significantly decrease the trap state density of the binary blend films,which is beneficial for the charge transport and *** these features enable an obvious decrease in charge recombination in both PBDB-T:IT-M and PBDB-TF:Y6 based organic solar cells(OSCs),and power conversion efficiencies(PCEs)of 12.5%and 16.42%were obtained for the ternary OSCs,*** work indicates that it is an effective method to suppress the trap state density and thus improve the device performance through ternary strategy.

关键词： non-fullerene organic solar cells ternary strategy vertical phase distribution trap state density energy loss

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Field intensity dependence of the dissociative multiple ionization of argon dimers in strong femtosecond laser fields

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Science China(Physics,Mechanics & Astronomy) 2024年第12期67卷 70-78页

作者： Pan Song Yalei Zhu Xiaowei Wang Congsen Meng Tao Jiang Zhihui Lv Dongwen Zhang chaochao qin Zengxiu Zhao Jianmin Yuan Department of Physics National University of Defense TechnologyChangsha 410073China Henan Key Laboratory of Infrared Spectrum Measures and Applications Schoolof PhysicsHenan NormalUniversityXinxiang 453007China Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China

The dissociative ionization of Ar dimers is investigated in femtosecond laser fields with intensities from 260 to 1020 TW/cm^(2).The three-dimensional momentum and kinetic-energy release of fragmental ions generated from the channels Ar_(2)^(2+)→Ar^(+)+Ar^(+),Ar_(2)^(3+)→Ar^(2+)+Ar^(+),and Ar_(2)^(4+)→Ar^(2+)+Ar^(2+)were measured with a cold-target recoil-ion momentum *** is shown that the laser intensity significantly modulates the kinetic energies and angular distributions of fragmental ions from dissociative double ***-induced charge-transfer following one-site double ionization contributes relatively more to the dissociative double ionization at lower laser *** calculation results of a one-dimensional model based on the WKB approximation suggest that the charge transfer is suppressed at higher laser intensity due to the core polarization *** addition,double,triple,and quadruple dissociative ionizations of Ar dimers are accompanied by frustrated-tunneling ionization that increases with the laser intensity.

关键词： femtosecond laser charge transfer Coulomb explosion frustrated tunneling ionization

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Trajectory analysis of few-cycle strong field ionization in two-color circularly polarized fields

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Chinese Physics B 2019年第9期28卷 16-21页

作者： Yan Huang chaochao qin Yizhu Zhang Xincheng Wang Tian-Min Yan Yuhai Jiang College of Physics and Materials Science Henan Normal UniversityXinxiang 453007China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China ShanghaiTech University Shanghai 201210China Key Laboratory of Opto-electronics Information and Technical Science Tianjin UniversityTianjin 300072China

Bichromatic circularly polarized fields provide a useful tool to probe the ionization *** this work, we compare the photoelectron momentum distribution in few-cycle bichromatic field of different *** spectral features are analyzed with semiclassical trajectories derived from the strong field *** particular, the interference fringes in momentum distribution are investigated by tracking the ionization time and tunneling exits of released *** types of trajectories that contribute to the interference fringes are elucidated.

关键词： strong field ionization semiclassical trajectories bicircularly polarized fields photoelectron momentum

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Ultrafast dynamics of o-fluorophenol studied with femtosecond time-resolved photoelectron and photoion spectroscopy

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Science China(Physics,Mechanics & Astronomy) 2010年第6期53卷 1040-1044页

作者： ZHENG QiuSha qin chaochao LONG JinYou TANG BiFeng ZHANG Song ZHANG Bing State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China Graduate University of the Chinese Academy of Sciences Beijing 100049China Department of Physics Xiaogan UniversityXiaogan 432000China

The ultrafast dynamics of o-fluorophenol via the excited states has been studied by femtosecond time-resolved photoelectron imaging. The photoion and photoelectron spectra taken with a time delay between 267 nm pump laser and 800 nm probe laser provide a longer-lived S1 electronic state of about ns timescale. In comparison,the spectra obtained by exciting the S2 state with femtosecond laser pulses at 400 nm and ionizing with pulses at 800 nm suggest that the S2 state has an ultrashort lifetime about 102 fs and reflects the internal conversion dynamics of the S2 state to the S1 state.

关键词： o-fluorophenol femtosecond time-resolved photoelectron imaging excited states

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Tuning exciton dynamics by the dielectric confinement effect in quasi-two-dimensional perovskites

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Photonics Research 2024年第3期12卷 563-570页

作者： MINGHUAN CUI chaochao qin YUANZHI JIANG SHICHEN ZHANG CHANGJIU SUN MINGJIAN YUAN YONGGANG YANG YUFANG LIU Henan Key Laboratory of Infrared Materials&Spectrum Measures and Applications Henan Normal UniversityXinxiang 453007China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China Institute of Physics Henan Academy of SciencesZhengzhou 450046China

The dielectric confinement effect plays an essential role in optoelectronic *** studies on the relationship between the dielectric confinement and the photoelectric properties are ***,three organic spacers with different dielectric constants are employed to tune the exciton dynamics of quasi-two-dimensional(quasi-2D)Ruddlesden–Popper perovskite *** transient absorption spectroscopy reveals that the small dielectric constant ligand enables a weak dynamic disorder and a large modulation depth of the coherent phonons,resulting in a more complete energy transfer and the inhibition of a trap-mediated nonradiative ***,the increase in the bulk-ligand dielectric constant reduces the corresponding exciton binding energy and then suppresses the Auger recombination,which is beneficial for high-luminance lightemitting *** work emphasizes the importance of dielectric confinement for regulating the exciton dynamics of layered perovskites.

关键词： dielectric perovskite quasi

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Atomically precise metal-chalcogenide semiconductor molecular nanoclusters with high dispersibility:Designed synthesis and intracluster photocarrier dynamics

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Nano Research 2020年第10期13卷 2828-2836页

作者： Jiaxu Zhang chaochao qin Yeshuang Zhong Xiang Wang Wei Wang Dandan Hu Xiaoshuang Liu Chaozhuang Xue Rui Zhou Lei Shen Yinglin Song Dingguo Xu Zhien Lin Jun Guo Haifeng Su Dong-Sheng Li Tao Wu College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Henan Key Laboratory of Infrared Materials&Spectrum Measures and Applications School of PhysicsHenan Normal UniversitXinxiang 453007China College of Chemistry Sichuan UnivrsityChengdu 610064China School of Physical Science and Technology Soochow UniversitySuzhou 215123China Testing&Analysis Centre Soochow UniversitySuzhou 215123China College of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005China College of Materials and Chemical Engineering Hubei Provincial Collaborative Innovation Centre for New Energy Microgrid Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002China

A comprehensive understanding of excited-state dynamics of semiconductor quantum dots or nanomaterials at the atomic or molecular level is of scientific *** inorganic(or non-covalently protected)seimiconductor molecular nanoclusters with atomically precise structure are contributive to establish accurate correlation of excited-state dynamics with their composition/structure,however,the related studies are almost blank because of unresolved solvent dispersion ***,we designedly created the largest discrete chalcogenide seimiconductor molecular nanoclusters(denoted P2-CuMSnS,M=In or/and Ga)with great dispersibility,and revealed an interesting intracluster“core–shell”charge transfer relaxation dynamics.A systematic red shift in absorption spectra with the gradual substitution of In by Ga was experimentally and computationally investigated,and femtosecond transient absorption measurements further manifested there were three ultrafast processes in excited-state dynamics of P2 nanoclusters with the corresponding amplitudes directed by composition *** results hold the great promise of the solution-processible applications of semiconductor-NC-based quantum dots and facilitate the development of atomically precise nano-chemistry.

关键词： semiconductor nanoclusters photocarrier dynamics charge transfer atomically precise

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Carrier Separation Actions of CH3NH3PbI3-xClx-MoOx Bulk Heterojunction in Perovskite Solar Cells

Carrier Separation Actions of CH3NH3PbI3-xClx-MoOx Bulk Hete...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者： Yurong Jiang Yanxing Feng Kaikai Liu chaochao qin Heng Ma College of Physics and Materials Science Henan Key Laboratory of Photovoltaic MaterialsHenan Normal University College of Physics and Materials Science Henan Key Laboratory of Photovoltaic MaterialsHenan Normal UniversityXinxiang453007China

The inverted-planar bulk heterojunction perovskite solar cells were fabricated by incorporating nanoparticle MoOx into the CHNHPbICl perovskite active layers. The results showed that the device performances had been significantly improved, mainly reflected the enhancement of the open-circuit voltage from an average of 0.895 V to 0.959 V. This should be attributed to formation of bulk heterojunctions that can effectively separate and extract the carrier, and reduce carrier recombination. In addition, the conductive atomic force microscopy spectroscopy verified that the surface current of the perovskite-MoOx is larger than that of the pure perovskite film. The relationship between capacitance and frequency was tested and indirectly proved that bulk heterojunctions can rapidly separate the carriers. The ultrafast transient absorption spectroscopy measurements provided a reasonable explanation for the MoOx-induced rapidly separating of the carriers. Our research illustrates the application potential of bulk heterojunctions in the perovskite solar cells through doping the MoOx inorganic materials into the perovskite active layer, as well as further consolidates the role of bulk heterojunctions in perovskite active layer.

关键词： Perovskite solar cells Bulk heterojunction MoOx doping Ultrafast transient absorption spectroscopy Carrier separation

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Energy funneling and charge separation in CdS modified with dual cocatalysts for enhanced H_(2) generation

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Chinese Journal of Catalysis 2022年第7期43卷 1818-1829页

作者： Meiyu Zhang chaochao qin Wanjun Sun Congzhao Dong Jun Zhong Kaifeng Wu Yong Ding State Key Laboratory of Applied Organic Chemistry Key Laboratory of Advanced Catalysis of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000GansuChina State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Henan Key Laboratory of Infrared Materials and Spectrum Measures and Applications School of PhysicsHenan Normal UniversityXinxiang 453007HenanChina Jiangsu Key Laboratory for Carbon‐Based Functional Materials and Devices Institute of Functional Nano and Soft Materials(FUNSOM)Soochow UniversitySuzhou 215123JiangsuChina State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000GansuChina

Anchoring molecular cocatalysts on semiconductors has been recognized as a general strategy to boost the charge separation efficiency required for efficient ***,the effect of molecular cocatalysts on energy funneling(i.e.,directional energy transfer)inside semiconductor photocatalysts has not been demonstrated *** we prepared CdS nanorods with both thin and thick rods and anchored the conjugated molecules 2‐mercaptobenzimidazole(MBI)and cobalt molecular catalysts(MCoA)sequentially onto the surface of *** absorption measurements revealed that MBI molecules facilitated energy funneling from thin to thick rods by the electronic coupling between thin and thick nanorods,which is essentially a light‐harvesting antenna approach to enhance the charge generation efficiency in the reaction center(here the thick rods).Moreover,MBI and MCoA molecules selectively extracted photogenerated holes and electrons of CdS nanorods rapidly,leading to efficient charge ***,CdS/MBI/MCoA displayed 15 times enhanced photocatalytic H_(2) evolution(1.65 mL)than pure CdS(0.11 mL)over 3 h of *** amount of H_(2) evolution reached 60 mL over 48 h of illumination with a high turnover number of 26294 and an apparent quantum efficiency of 71%at 420 *** study demonstrates a novel design principle for next‐generation photocatalysts.

关键词： Energy funneling Charge separation CdS nanorods Molecular cocatalyst Photocatalytic H_(2)generation

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