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High-Quality Reduced Graphene Oxide Electrodes for Sub-Kelvin Studies of Molecular Monolayer Junctions
摘要： Electron transport phenomena in molecular monolayers are complex and potentially different from those for example, molecule?molecule interactions. Unfortunately, access to detailed mechanistic investigations of molecular monolayer junctions at ultralow temperatures is typically hampered by the narrow range of operating temperatures for most large-area device platforms. Here, we present a highly optimized chemically derived graphene material with a near temperature-independent conductance profile. Using this material as a conducting interlayer electrode in solid-state molecular electronic devices, we show robust and reliable large-area molecular junction operation at temperatures ranging from room temperature to below 1 K, and we demonstrate the ability to measure inelastic electron tunneling spectroscopy of a conjugated molecular monolayer at cryogenic temperatures.
关键词： inelastic electron tunneling spectroscopy,cryogenic temperatures,molecular monolayers,graphene,electron transport
更新于2025-09-23 15:21:01
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Light from van der Waals quantum tunneling devices
摘要： The understanding of and control over light emission from quantum tunneling has challenged researchers for more than four decades due to the intricate interplay of electrical and optical properties in atomic scale volumes. Here we introduce a device architecture that allows for the disentanglement of electronic and photonic pathways—van der Waals quantum tunneling devices. The electronic properties are defined by a stack of two-dimensional atomic crystals whereas the optical properties are controlled via an external photonic architecture. In van der Waals heterostructures made of gold, hexagonal boron nitride and graphene we find that inelastic tunneling results in the emission of photons and surface plasmon polaritons. By coupling these heterostructures to optical nanocube antennas we achieve resonant enhancement of the photon emission rate in narrow frequency bands by four orders of magnitude. Our results lead the way towards a new generation of nanophotonic devices that are driven by quantum tunneling.
关键词： van der Waals heterostructures,inelastic electron tunneling,nanophotonics,light emission,quantum tunneling,optical antennas
更新于2025-09-19 17:15:36
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[IEEE 2018 IEEE SENSORS - New Delhi, India (2018.10.28-2018.10.31)] 2018 IEEE SENSORS - IETS in MIS Contacts: Towards a Quantum Biomimetic Electronic Nose
摘要： Inelastic electron tunneling spectroscopy (IETS) has been used to detect the vibrational modes of molecules and has been proposed as the mechanism of olfaction according to the so-called Vibration Theory. Motivated by the promise of an electronic nose that will be biomimetic - in the sense of the Vibration Theory - we demonstrate here IET spectroscopy of vibrational modes in metal-insulator-semiconductor (MIS) devices consisting of ultrathin HfO2 deposited on silicon by Atomic Layer Deposition (ALD). Low-noise IETS measurements at 10K are carried out using second harmonic detection by a standard lock-in procedure. Parallely, a filtering algorithm is applied to the measured I-V data to compute its second derivative. The IETS peaks in the filtered data and experimentally measured lock-in data are compared and are found to be in agreement with each other; as well as with other experimental vibrational energy data measured through IETS or other techniques.
关键词： smoothening algorithm,Inelastic Electron Tunneling Spectroscopy,Electronic nose
更新于2025-09-19 17:15:36