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Secondary Aggregation Induced by Volatile Additive for Improved Exciton Diffusion and Charge Separation in High Efficiency Organic Photovoltaic Devices

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Chinese Journal of Chemistry 2024年第22期42卷 2825-2832页

作者： Yufeng Ge Xuewu Li Mingxu Zhou Peng Lu xiaotao hao School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinanShandong 250100China schoolof Physics National Demonstration Center for Experimental Physics EducationShandong University JinanShandong 250100 China ARC Centre of Excelence in Exciton Science Schoolof ChemistryThe Universityof MebourneParkvilleVictoria 31Australia

Comprehensive Summary The morphology of the active layer plays a crucial role in the performance of organic *** volatile additives are commonly used to manipulate the morphology,their mechanism of action remains poorly *** this study,we conducted a systematic exploration of the mechanism of the traditional volatile additive 1-CN in film formation kinetics of typical PM6:Y6 *** found that 1-CN induces a secondary aggregation effect,improving film morphology and promoting face-on crystalline *** elucidating its impact on exciton dynamics,we established a link between morphology optimization and increased exciton diffusion length and accelerated charge *** findings unveil the unique mechanism of action of volatile additive,providing a new perspective for improving the morphology and enhancing the performance of organic photovoltaic devices.

关键词： Organic photovoltaics Volatile additive Exciton diffusion Charge separation Hole transfer Morphology control Photophysics Kinetics π-πStacking Time-resolved spectroscopy Adsorption

All organic multiferroic magnetoelectric complexes with strong interfacial spin-dipole interaction

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npj Flexible Electronics 2021年第1期5卷 192-197页

作者： Yuying Yang Zhiyan Chen Xiangqian Lu xiaotao hao Wei Qin School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinanChina ARC Centre of Excellence in Exciton Science School of ChemistryThe University of MelbourneParkvilleVICAustralia

The organic magnetoelectric complexes are beneficial for the development on flexible magnetoelectric devices in the *** this work,we fabricated all organic multiferroic ferromagnetic/ferroelectric complexes to study magnetoelectric coupling at room *** the stimulus of external magnetic field,the localization of charge inside organic ferromagnets will be enhanced to affect spin–dipole interaction at organic multiferroic interfaces,where overall ferroelectric polarization is tuned to present an organic magnetoelectric ***,the magnetoelectric coupling of the organic ferromagnetic/ferroelectric complex is tightly dependent on incident light *** light intensity,the dominated interfacial interaction will switch from spin–dipole to dipole–dipole interaction,which leads to the magnetoelectric coefficient changing from positive to negative in organic multiferroic magnetoelectric complexes.

关键词： temperature dipole complexes

DEEP-UV CONFOCAL FLUORESCENCE IMAGING AND SUPER-RESOLUTION OPTICAL MICROSCOPY OF BIOLOGICAL SAMPLES

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Journal of Innovative Optical Health Sciences 2012年第4期5卷 24-32页

作者： TREVOR A.SMITH LIISA M.HIRVONEN CRAIG N.LINCOLN xiaotao hao School of Chemistry and ARC Centre of Excellence for Coherent X-ray Science University of Melbourne Parkville 3010Australia

A wide range of techniques has been developed to image biological samples at high spatial and temporal *** this paper,we report recent results from deep-UV confocal fAuorescence microscopy to image inherent emission from fuorophores such as tryptophan,and structured ilumination microscopy(SIM)of biological *** motivation for developing deep-UV fhuorescence imaging and SIM is to provide methods to complement our measurements in the emerging field of X-ray coherent diffractive imaging.

关键词： Time resolved fuorescence imaging structured ilumnina tion microscopy

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

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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

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

Effects of various donor:acceptor blend ratios on photophysical properties in non-fullerene organic bulk heterojunctions

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Chinese Chemical Letters 2019年第5期30卷 995-999页

作者： Zhenchuan Wen Xuejian Ma Xiaoyu Yang Pengqing Bi Mengsi Niu Kangning Zhang Lin Feng xiaotao hao School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJi'nan 250100China ARC Centre of Excellence in Exciton Science School of ChemistryThe University of MelbourneParkvilleVictoria3010Australia

The composition ratio of donor and acceptor materials in organic bulk heterojunction (BHJ) is one of the key parameters to govern the performance in organic solar cells (OSCs). Therefore, high-performance non-fullerene organic bulk heterojunction consisting of poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b' ]dithiophene))-co-(1,3-di(5-thiophene-2-yl)–5,7-bis(2-ethylhexyl) benzo[1,2-c:4,5-c']dithiophene-4,8-dione)] (PBDB-T) and 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))–5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2' ,3'-d' ]-s-indaceno[1,2-b:5,6-b' ]-dithio-phene (ITIC) are used to investigate the correlation among various donor: acceptor (D:A) ratios, photophysical properties and photovoltaic performance. Interestingly, the function of short-circuit current (Jsc) and D:A ratios demonstrates an axisymmetric trend. When the blending ratio of D:A deviates from the optimal ratio, the symmetrically decreased Jsc is derived from a reduction in the D:A interface or amorphous region. Research on the steady-state photoluminescence (PL), the time-resolved fluorescence spectroscopy measurements, atomic force microscopic (AFM) and grazing-incidence small angle X-rays scattering (GIWAXS) indicates no significant variation in energy loss in the process of changing D:A ratios in BHJs. With high donor or acceptor content, the domain size improves significantly, but the distance of π-π stacking corresponding to molecular packing has not changed significantly, and the bi-continuous percolation pathways were not obviously influenced.

关键词： Photophysical properties Non-fullerene Bulk heterojunctions Various blend ratios Organic solar cells

Chemical vapor deposition growth of phase-selective inorganic lead halide perovskite films for sensitive photodetectors

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Chinese Chemical Letters 2021年第1期32卷 489-492页

作者： Weilong Xu Mengsi Niu Xiaoyu Yang Haiyue Chen Xiaohong Cai Trevor A.Smith Kenneth PGhiggino xiaotao hao School of Photoelectric Engineering Changzhou Institute of TechnologyChangzhou 213002China School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJi'nan 250100China ARC Centre of Excellence in Exciton Science School of ChemistryThe University of MelbourneParkvilleVictoria 3010Australia

Inorganic lead halide perovskites are attractive optoelectronic materials owing to their relative stability compared to organic cation *** chemical vapor deposition(CVD) method offers potential for high quality perovskite film *** deposition temperature is a critical parameter determining the film quality owing to the melting difference between the ***,perovskite films were deposited by the CVD method at various temperatures between 500-800℃.The perovskite phase converts from CsPb_(2)Br_(5) to CsPbBr_(3) gradually as the deposition temperature is *** grain size of the perovskite films also increases with *** phase transition mechanism was *** photoexcited state dynamics were investigated by spatially and temporally resolved fluorescence *** perovskite film deposited under 750℃ condition is of the CsPbBr_(3) phase,showing low trap-state density and large crystalline grain size.A photodetector based on perovskite films shows high photocurrent and an on/off ratio of ~2.5×10^(4).

关键词： Chemical vapor deposition Inorganic perovskite Phase-selective Photodetector Photophysical dynamics

Tandem organic solar cells with 20.6% efficiency enabled by reduced voltage losses

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National Science Review 2023年第6期10卷 215-225页

作者： Jianqiu Wang Zhong Zheng Pengqing Bi Zhihao Chen Yafei Wang Xiaoyu Liu Shaoqing Zhang xiaotao hao Maojie Zhang Yongfang Li Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductoroptoelectronics Materials and Devices College of Chemistry Chemical Engineering and Materials Science Soochow University School of Chemistry and Biology Engineering University of Science and Technology Beijing School of Physics State Key Laboratory of Crystal Materials Shandong University University of Chinese Academy of Sciences CAS Key Laboratory of Organic Solids Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences

Large voltage losses are the main obstacle for achieving high efficiency in organic solar cells(OSCs).Here we construct ternary OSCs by introducing an asymmetric small molecule acceptor AITC into PBDB-TCl:BTP-eC9 system and demonstrate the effectiveness in simultaneously decreasing energy disorder and non-radiative voltage *** is found that the introduction of AITC can modify domain size and increase the degree of crystallinity,which enhances open-circuit voltage and power conversion efficiency(19.1%,certified as 18.9%).Inspiringly,an output efficiency of 20.6% of the constructed tandem OSCs based on PBDB-TCl:AITC:BTP-eC9 ternary active layer output a recorded efficiency of 20.6%(certified as 20.3%),which is the highest value in OSCs field to *** work demonstrates that decreasing the voltage losses by ternary strategy and constructing of tandem architecture are effective approaches towards improving photovoltaic performance.

关键词： organic solar cells power conversion efficiency voltage losses tandem cells ternary strategy

Extracting energetic disorder in organic solar cells using percolation models

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ChemPhysMater 2023年第1期2卷 52-57页

作者： Rui Shi Haixia Hu Tao Chen Ruohua Gui Jianqiang Liu xiaotao hao Hang Yin School of Physics Shandong UniversityJinan 250100China School of Physics and Electrical Engineering Kashgar UniversityKashgar 844000China

The energetic disorder𝜎describes the energy state distribution in organic semiconducting *** organic solar cells(OSCs),energetic disorder is an important parameter for evaluating the charge transport behavior,and it is strongly correlated with the device *** far,a widely used approach for extracting energetic disorder values in OSCs is the Gaussian disorder model(GDM),in which the disorder values can be extracted by fitting the slope of lnμ∼1-T2,where𝜇is the charge mobility and𝑇is the ***,we demonstrate the potential of the percolation approach to evaluate the energetic disorder values in OSCs and compare them with the data obtained using the GDM *** typical non-fullerene acceptor(NFA)-based bulk heterojunction(BHJ)films,with PTB7-Th:ITIC and PM6:Y6,were selected as the model *** the percolation models were adopted in the two BHJ films,the energetic disorder values extracted from the Grünewald/Thomas and Nenashev percolation models gave similar results for electron transport in the PTB7-Th:ITIC and PM6:Y6 BHJ *** work successfully demonstrates the feasibility of microresistance analysis in BHJ systems and the application potential of the percolation model for extracting energetic disorders in OSCs.

关键词： Organic solar cell Bulk heterojunction film Percolation model Energetic disorder Capacitance spectra