Plasmon-induced hot electron can transfer from noble metal to its cohesive semiconductor in their heterostructure to initiate the photocatalytic reaction upon resonance excitation.However,the co-excitation of semicond...Plasmon-induced hot electron can transfer from noble metal to its cohesive semiconductor in their heterostructure to initiate the photocatalytic reaction upon resonance excitation.However,the co-excitation of semiconductor in the heterostructure would also lead to the inversus transfer of photo-electron from semiconductor to noble metal,which inevitably limits the use of active electrons.After co-excitation of both localized surface plasmon resonance(LSPR)of noble metal and interband transition of semiconductor,the interfacial electron transfer process strongly depends on the energy band configuration of their heterostructure.When the Au content in the AuAg alloy nanoparticles(NPs)changes from 0 to 100 at.%,the interfacial energy band configuration at AuAg NPs/TiO_(2) NPs in the electrospun nanofibers(NFs)shifts from Ohmic to Schottky contacts.Further investigation finds that the optimal Schottky barrier configuration in Au_(0.25)Ag_(0.75)/TiO_(2) NFs can not only boost the plasmon-induced hot electron transfer from Au_(0.25)Ag_(0.75) to TiO_(2) NPs,but also suppresses the backflow of photo-electrons from TiO_(2) to Au_(0.25)Ag_(0.75) NPs in NFs.Thus,upon UV-visible light irradiation,the CO_(2) photo-reduction activity of Au_(0.25)Ag_(0.75)/TiO_(2) NFs is~3 and~2 times higher than that of either Ag/TiO_(2) or Au/TiO_(2) NFs.展开更多
Balance equation approach to the hot-electron transport in electric and magnetic fields is reformulated.The balance equations are re-derived from the Boltzmann equation. A new expression for the distribution function ...Balance equation approach to the hot-electron transport in electric and magnetic fields is reformulated.The balance equations are re-derived from the Boltzmann equation. A new expression for the distribution function isreported in the present paper. It is homogeneous steady solution of the Boltzmann equation in constant relaxation timeapproximation. It holds when ωocτ < i or ωc < Te. As an example, the mobility of 2D electron gas in the GaAs-AlGaAsheterojunction is computed as a function of electric field and magnetic field.展开更多
The controlled tailoring of the energy distribution in an electron system opens the way to interesting new physics and device concepts, as demonstrated by research on metallic nanodevices during recent years. Here we ...The controlled tailoring of the energy distribution in an electron system opens the way to interesting new physics and device concepts, as demonstrated by research on metallic nanodevices during recent years. Here we investigate how Josephson coupling in a superconductor-InAs nanowire junction can be tuned by means of hot-electron injection and we show that a complete suppression of superconductive effects can be achieved using a power as low as 100 pW. Nanowires offer a novel design freedom as they allow axial and radial heterostructures to be defined as well as control over doping profiles, which can be crucial in the development of devices--such as nanorefrigerators--where precisely controlled and predictable energy barriers are mandatory. Our work provides estimates for unknown key thermal and electrical parameters, such as the electron-phonon coupling, in our InAs nanostructures.展开更多
Hot electron emission means that electrons move over potential barriers to come out of the metal when the metal is being heated.Obviously,voltage will generate between electrons and the metal.Based on this,the model o...Hot electron emission means that electrons move over potential barriers to come out of the metal when the metal is being heated.Obviously,voltage will generate between electrons and the metal.Based on this,the model of metal hot-electron power generation is built.Free electron model of Sommerfeld is used to describe the movement of electrons in metal.According to the different width of potential barriers,two models are built.One assumes that electrons move from one metal to another mainly by moving over the potential barrier as the barrier is wide enough.The other assumes that the potential barrier is so narrow that electrons mainly move through the potential barrier by tunnel effect.The first model is analyzed and proved strictly,including the building of model,the calculation of open-circuit voltage and the drawing of volt-ampere characteristic curve.The second model is analysed simply.This paper shows that power generation by metal hot-electron is possible based on the theory and can provide reference for researching in power generation of metal hot-electron.展开更多
Plasmonic metal electrodes with subwavelength nanostructures are promising for enhancing light harvesting in photovoltaics.However,the nonradiative damping of surface plasmon polaritons(SPPs)during coupling with sunli...Plasmonic metal electrodes with subwavelength nanostructures are promising for enhancing light harvesting in photovoltaics.However,the nonradiative damping of surface plasmon polaritons(SPPs)during coupling with sunlight results in the conversion of the excited hot-electrons to heat,which limits the absorption of light and generation of photocurrent.Herein,an energy recycling strategy driven by hotelectron emission for recycling the SPP energy trapped in the plasmonic electrodes is proposed.A transparent silver-based plasmonic metal electrode(A-PME)with a periodic hexagonal nanopore array is constructed,which is combined with a luminescent organic emitter for radiative recombination of the injected hot-electrons.Owing to the suppressed SPP energy loss via broadband hot-electron emission,the A-PME achieves an optimized optical transmission with an average transmittance of over 80%from 380 to 1200 nm.Moreover,the indium-tin-oxide-free organic solar cells yield an enhanced light harvestingwith a power conversion efficiency of 16.1%.展开更多
基金supported by the National Natural Science Foundation of China(Nos.:22472021,U23A20102,12074055,22402021 and 62005036)Liaoning Revitalization Talents Program(XLYC2202036,XLYC1807176)+4 种基金Natural Science Foundation of Liaoning Province for Excellent Young Scholars(2022-YQ-13)Fundamental Research Funds for the Central Universities(044420250072)Dalian Science Foundation for Distinguished Young Scholars(2018RJ05)Natural Science Foundation of Liaoning Province(2023-MS-132)Joint Funds of the Science and Technology Program of Liaoning Province(No.2024JH2/102600101).
文摘Plasmon-induced hot electron can transfer from noble metal to its cohesive semiconductor in their heterostructure to initiate the photocatalytic reaction upon resonance excitation.However,the co-excitation of semiconductor in the heterostructure would also lead to the inversus transfer of photo-electron from semiconductor to noble metal,which inevitably limits the use of active electrons.After co-excitation of both localized surface plasmon resonance(LSPR)of noble metal and interband transition of semiconductor,the interfacial electron transfer process strongly depends on the energy band configuration of their heterostructure.When the Au content in the AuAg alloy nanoparticles(NPs)changes from 0 to 100 at.%,the interfacial energy band configuration at AuAg NPs/TiO_(2) NPs in the electrospun nanofibers(NFs)shifts from Ohmic to Schottky contacts.Further investigation finds that the optimal Schottky barrier configuration in Au_(0.25)Ag_(0.75)/TiO_(2) NFs can not only boost the plasmon-induced hot electron transfer from Au_(0.25)Ag_(0.75) to TiO_(2) NPs,but also suppresses the backflow of photo-electrons from TiO_(2) to Au_(0.25)Ag_(0.75) NPs in NFs.Thus,upon UV-visible light irradiation,the CO_(2) photo-reduction activity of Au_(0.25)Ag_(0.75)/TiO_(2) NFs is~3 and~2 times higher than that of either Ag/TiO_(2) or Au/TiO_(2) NFs.
文摘Balance equation approach to the hot-electron transport in electric and magnetic fields is reformulated.The balance equations are re-derived from the Boltzmann equation. A new expression for the distribution function isreported in the present paper. It is homogeneous steady solution of the Boltzmann equation in constant relaxation timeapproximation. It holds when ωocτ < i or ωc < Te. As an example, the mobility of 2D electron gas in the GaAs-AlGaAsheterojunction is computed as a function of electric field and magnetic field.
文摘The controlled tailoring of the energy distribution in an electron system opens the way to interesting new physics and device concepts, as demonstrated by research on metallic nanodevices during recent years. Here we investigate how Josephson coupling in a superconductor-InAs nanowire junction can be tuned by means of hot-electron injection and we show that a complete suppression of superconductive effects can be achieved using a power as low as 100 pW. Nanowires offer a novel design freedom as they allow axial and radial heterostructures to be defined as well as control over doping profiles, which can be crucial in the development of devices--such as nanorefrigerators--where precisely controlled and predictable energy barriers are mandatory. Our work provides estimates for unknown key thermal and electrical parameters, such as the electron-phonon coupling, in our InAs nanostructures.
文摘Hot electron emission means that electrons move over potential barriers to come out of the metal when the metal is being heated.Obviously,voltage will generate between electrons and the metal.Based on this,the model of metal hot-electron power generation is built.Free electron model of Sommerfeld is used to describe the movement of electrons in metal.According to the different width of potential barriers,two models are built.One assumes that electrons move from one metal to another mainly by moving over the potential barrier as the barrier is wide enough.The other assumes that the potential barrier is so narrow that electrons mainly move through the potential barrier by tunnel effect.The first model is analyzed and proved strictly,including the building of model,the calculation of open-circuit voltage and the drawing of volt-ampere characteristic curve.The second model is analysed simply.This paper shows that power generation by metal hot-electron is possible based on the theory and can provide reference for researching in power generation of metal hot-electron.
基金ARC Centre of Excellence for Future Low-Energy Electronics Technologies(FLEET)Collaborative Innovation Center of Suzhou Nano Science&Technology+3 种基金Jiangsu Provincial Research Scheme of Natural Science for Higher Education Institutions,Grant/Award Number:19KJB510056the Natural Science Foundation of Jiangsu Province of China,Grant/Award Number:BK20190815the 333 program,Grant/Award Number:BRA2019061National Natural Science Foundation of China,Grant/Award Numbers:11804084,12074104,62075061,61905171,51873138。
文摘Plasmonic metal electrodes with subwavelength nanostructures are promising for enhancing light harvesting in photovoltaics.However,the nonradiative damping of surface plasmon polaritons(SPPs)during coupling with sunlight results in the conversion of the excited hot-electrons to heat,which limits the absorption of light and generation of photocurrent.Herein,an energy recycling strategy driven by hotelectron emission for recycling the SPP energy trapped in the plasmonic electrodes is proposed.A transparent silver-based plasmonic metal electrode(A-PME)with a periodic hexagonal nanopore array is constructed,which is combined with a luminescent organic emitter for radiative recombination of the injected hot-electrons.Owing to the suppressed SPP energy loss via broadband hot-electron emission,the A-PME achieves an optimized optical transmission with an average transmittance of over 80%from 380 to 1200 nm.Moreover,the indium-tin-oxide-free organic solar cells yield an enhanced light harvestingwith a power conversion efficiency of 16.1%.
