研究目的
To introduce and demonstrate a device architecture that disentangles electronic and photonic pathways in quantum tunneling for enhanced light emission, enabling independent control over electronic and optical properties.
研究成果
The van der Waals quantum tunneling device platform successfully enables independent control over electronic and optical properties, with inelastic electron tunneling identified as the mechanism for light emission. Coupling to nanocube antennas enhances photon emission rates by over four orders of magnitude, paving the way for advanced nanophotonic devices.
研究不足
The source efficiency is reduced compared to traditional metal-insulator-metal devices due to dominance of phonon-assisted tunneling. Asymmetries in emission spectra may arise from deviations in wave function decay or gate-dependent barrier effects. The study is conducted under ambient conditions, which might affect device performance.
1：Experimental Design and Method Selection:
The study uses van der Waals quantum tunneling devices composed of gold, hexagonal boron nitride (h-BN), and graphene heterostructures. Theoretical models based on Fermi's golden rule and classical electrodynamics are employed to analyze inelastic electron tunneling and light emission.
2：Sample Selection and Data Sources:
Devices are fabricated on glass coverslips with gold electrodes, h-BN crystals (6-7 layers), and monolayer graphene. Nanocube antennas are deposited from solution.
3：List of Experimental Equipment and Materials:
Includes photolithography tools, electron beam evaporator, atomic force microscope, optical microscope (Nikon TE300), source meter unit (Keithley 2602B), EMCCD camera (Andor iXon Ultra), spectrometer (Princeton Instruments Acton SpectraPro 300i), silver nanocubes (Nanocomposix), and materials like titanium, gold, graphene, h-BN, PDMS, PC, chloroform, etc.
4：Experimental Procedures and Operational Workflow:
Fabrication involves electrode definition, material exfoliation and transfer, annealing, and nanocube deposition. Characterization includes electrical measurements, spatial and spectral imaging of light emission, and analysis of radiation patterns.
5：Data Analysis Methods:
Data are corrected for system transmission and detection efficiency. Theoretical calculations compare experimental results with models for inelastic tunneling rates and local density of states.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
