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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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Promoted surface charge density from interlayer Zn–N_(4) configuration in carbon nitride for enhanced CO_(2) photoreduction

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Nano Research 2024年第4期17卷 2400-2409页

作者： Xianjin Shi Yu Huang Gangqiang Zhu Wei Peng Meijuan Chen State Key Laboratory of Loess and Quaternary Geology(SKLLQG) Key Laboratory of Aerosol Chemistry and PhysicsInstitute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China Center of Excellence in Quaternary Science and Global Change Chinese Academy of SciencesXi’an 710061China University of Chinese Academy of Sciences Beijing 100049China School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710062China School of Human Settlements and Civil Engineering Xi’an Jiaotong UniversityXi’an 710049China

The solar-driven reduction of CO_(2) into valuable products is a promising method to alleviate global environmental problems and energy ***,the low surface charge density limits the photocatalytic conversion performance of CO_(2).Herein,a polymeric carbon nitride(PCN)photocatalyst with Zn single atoms(Zn1/CN)was designed and synthesized for CO_(2) *** results of the CO_(2) photoreduction studies show that the CO and CH_(4) yields of Zn1/CN increased fivefold,reaching 76.9 and 22.9μmol/(g·h),respectively,in contrast to the unmodified ***+plasma-etched X-ray photoelectron spectroscopy and synchrotron radiation-based X-ray absorption fine structure results reveal that Zn single atom is mainly present in the interlayer space of PCN in the Zn–N_(4) *** characterizations indicate that the interlayer Zn–N_(4) configuration can amplify light absorption and establish an interlayer charge transfer ***-assisted Kelvin probe force microscopy confirms that more photogenerated electrons are delivered to the catalyst surface through interlayer Zn–N_(4) configuration,which increases its surface charge ***,in-situ infrared spectroscopy combined with density functional theory calculation reveals that promoted surface charge density accelerates key intermediates(*COOH)conversion,thus achieving efficient CO_(2) *** work elucidates the role of internal single atoms in catalytic surface reactions,which provides important implications for the design of single-atom catalysts.

关键词： single-atom catalysts photocatalytic CO_(2)reduction interlayer modification charge transfer dynamics surface charge density

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Constructing Pd-N interactions in Pd/g-C_(3)N_(4)to improve the charge dynamics for efficient photocatalytic hydrogen evolution

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Nano Research 2022年第4期15卷 2928-2934页

作者： Xudong Xiao Siying Lin Liping Zhang Huiyuan Meng Jing Zhou Qi Li Jianan Liu Panzhe Qiao Baojiang Jiang Honggang Fu Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China School of Safety Engineering Heilongjiang University of Science and TechnologyHarbin 150080China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Chinese Acad Sci Shanghai Synchrotron Radiat FacilShanghai Adv Res InstShanghai 201204China

The formation of chemical bonds between metal ions and their supports is an effective strategy to achieve good catalytic ***,both the synthesis of active metal species on a support and control of their coordination environment are still ***,we show the use of an organic compound to produce tubular carbon nitride(TCN)as a support for Pd nanoparticles(NPs),creating a composite material(NP-Pd-TCN).It was found that Pd ions preferentially bind with the electron-rich N atoms of TCN,leading to strong metal-support interactions that benefit charge transfer from g-C_(3)N_(4)to Pd.X-ray absorption spectroscopy further revealed that the metal-support interactions resulted in the formation of Pd-N bonds,which are responsible for the improvement in the charge dynamics as evidenced by the results from various techniques including photoluminescence(PL)spectroscopy,photocurrent measurements,and electrochemical impedance spectroscopy(EIS).Owing to the good dynamical properties,NP-Pd-TCN was used for photocatalytic hydrogen evolution under visible-light irradiation(λ>420 nm)and an excellent evolution rate of~381μmol·h^(-1)(0.02 g of the photocatalyst)was *** work aims to promote a strategy to synthesize efficient photocatalysts for hydrogen production by controllably introducing metal nanoparticles on a support and in the meantime forming chemical bonds to achieve intimate metal-support contact.

关键词： carbon nitride charge transfer dynamics photocatalysis hydrogen evolution reaction

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Facile deposition of high-quality Cs2AgBiBr6 films for efficient double perovskite solar cells

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Science China Materials 2020年第8期63卷 1518-1525页

作者： Dandan Zhao Bingzhe Wang Chao Liang Tanghao Liu Qi Wei Sisi Wang Kaiyang Wang Zhipeng Zhang Xiaojun Li Shaomin Peng Guichuan Xing Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipaMacao SAR 999078China

Lead-free double perovskite,Cs2AgBiBr6,with higher stability and lower toxicity than those of its lead counterparts,has been considered a promising alternative for next-generation photovoltaic *** practical applications,a facile deposition method that could be used to fabricate high-quality double perovskite films with large grain size is highly ***,such kind of facile method has never been established for ***,high-quality Cs2AgBiBr6thin films with an average grain size of approximately 0.5μm were successfully deposited via a simple onestep spin-coating method by using dimethyl sulfoxide(DMSO)-N,N-dimethylformamide(DMF)mixture with optimized volume ratio as the solvent and chlorobenzene(CB)as the *** the basis of satisfactory quality of the film efficient(>1%)Cs2AgBiBr6perovskite solar cells were ***,the photo-generated charge-carrier transfer from Cs2AgBiBr6to the adjacent carrier extraction layers was systematically investigated via femtosecond transient *** study offers a new pathway to acquiring high-quality Cs2AgBiBr6thin films and provides a useful guide toward the development of high-efficiency double perovskite solar cells in the future.

关键词： lead-free double perovskite solar cell one-step spincoating Cs2AgBiBr6 charge transfer dynamics

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