655 research outputs found

    Versatile control of metal-assisted chemical etching for vertical silicon microwire arrays and their photovoltaic applications

    Get PDF
    A systematic study was conducted into the use of metal-assisted chemical etching (MacEtch) to fabricate vertical Si microwire arrays, with several models being studied for the efficient redox reaction of reactants with silicon through a metal catalyst by varying such parameters as the thickness and morphology of the metal film. By optimizing the MacEtch conditions, high-quality vertical Si microwires were successfully fabricated with lengths of up to 23.2 mu m, which, when applied in a solar cell, achieved a conversion efficiency of up to 13.0%. These solar cells also exhibited an open-circuit voltage of 547.7 mV, a short-circuit current density of 33.2 mA/cm(2), and a fill factor of 71.3% by virtue of the enhanced light absorption and effective carrier collection provided by the Si microwires. The use of MacEtch to fabricate high-quality Si microwires therefore presents a unique opportunity to develop cost-effective and highly efficient solar cells.open1

    A new multi-anticipative car-following model with consideration of the desired following distance

    Get PDF
    We propose in this paper an extension of the multi-anticipative optimal velocity car-following model to consider explicitly the desired following distance. The model on the following vehicle’s acceleration is formulated as a linear function of the optimal velocity and the desired distance, with reaction-time delay in elements. The linear stability condition of the model is derived. The results demonstrate that the stability of traffic flow is improved by introducing the desired following distance, increasing the time gap in the desired following distance or decreasing the reaction-time delay. The simulation results show that by taking into account the desired following distance as well as the optimal velocity, the multi-anticipative model allows longer reaction-time delay in achieving stable traffic flows

    Determination of the number of J/ψ events with J/ψ → inclusive decays

    Get PDF
    postprin

    Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay

    Get PDF
    published_or_final_versio

    The muon system of the Daya Bay Reactor antineutrino experiment

    Get PDF
    postprin

    Search for a Light Sterile Neutrino at Daya Bay

    Get PDF
    published_or_final_versio

    Quasi-radial growth of metal tube on si nanowires template

    Get PDF
    It is reported in this article that Si nanowires can be employed as a positive template for the controllable electrochemical deposition of noble metal tube. The deposited tube exhibits good crystallinity. Scanning electron microscope and transmission electron microscope characterizations are conducted to reveal the growth process of metal tube, showing that the metal tube grows quasi-radially on the wall of Si nanowire. The quasi-radial growth of metal enables the fabrication of thickness-defined metal tube via changing deposition time. Inner-diameter-defined metal tube is achieved by choosing Si nanowires with desired diameter as a template. Metal tubes with inner diameters ranging from 1 μm to sub-50 nm are fabricated

    Measurement of electron antineutrino oscillation based on 1230 days of operation of the Daya Bay experiment

    Get PDF
    published_or_final_versio

    Improved Search for a Light Sterile Neutrino with the Full Configuration of the Daya Bay Experiment

    Get PDF
    published_or_final_versio
    corecore