Experimental evidence of resonant field emission from ultrathin amorphous diamond thin film

She, Juncong; Xu, Ning; Deng, Shaozhi; Chen, Jun; Li, Z. B.; Huq, S. E.; Wang, L

doi:10.1002/sia.1720

Cited by 11 publications

(4 citation statements)

References 7 publications

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“…To avoid unnecessary technical complications, the present model is based on the common one-dimensional electron-transport approach, which is present in various theoretical studies related to the tunneling phenomenon. [3][4][5]7,9 More precisely, although the real system consisting of the bulk Au electrode, the WBG material, and the QCS on top is essentially a threedimensional ͑3D͒ structure, the electron tunneling rates in and out on the QCS will be described using the 1D WentzelKramers-Brillouin ͑WKB͒ approximation. Therefore a simple 1D approach for the energy diagram of that system is more suited.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Both emission mechanisms can appear in real experiments. Resonant tunneling in FE has been thoroughly investigated both from the theoretical [3][4][5] and experimental 6,7 points of view. However, while the existing theoretical models account for the pronounced peaks in the I-V characteristics followed by regions of negative differential resistance ͑NDR͒, experimental evidence is scarce due to the special conditions required for the occurrence of resonant tunneling during FE.…”

Section: Introductionmentioning

confidence: 99%

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Two-step electron tunneling from confined electronic states in a nanoparticle

et al. 2009

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Sequential two-step electron tunneling from nanoparticles has been studied from a transport point of view. A steady-state balance equation for the partial electron currents is derived and solved to obtain the stationary level occupancy, which leads to the overall tunneling current as a function of the applied field. Our model explains the steplike features observed in high field tunneling experiments involving composite cathodes that incorporate electronic quantum-confinement regions. In order to assess the validity of our model and to show the apparition of the steplike features in field-emission experiments, we have used the usual diode configuration to obtain current-voltage characteristics from a composite cathode. The theoretical model presented in this paper shows qualitative agreement with the experimental data.

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Section: Theoretical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-step electron tunneling from confined electronic states in a nanoparticle

et al. 2009

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“…This means high quality factor, low stray currents and a low level of distortion in the operation of vacuumelectronic devices based on such field cathodes. However, due to the integrated contribution to the emission current from several electronic states (which is typical for multi-band semiconductors), the increase in current near the resonances is usually rougher, but should also be high enough and sharp so that it can be attributed to such She et al, 2004). There are situations where facilities designed to detect the effects of resonant field emission do not show relevant salient features (Gu et al, 2012;Sarker et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

Multi-Pointed Field-Emission Cathode as a Generator of Highfrequency Oscillations

Братановский¹,

Amankulov²,

Медведев³

2020

PTQ

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Semiconductor field-emission cathodes have gained considerable popularity in modern radio electronics and electronic optics due to the high-power generation of the electron beam in the external electric field at temperatures close to the room ones. However, their wide application is restricted by the high dependence of the electron emission current on the value of the applied field and geometrical parameters of the cathode. This study aimed to examine the effect of resonance processes on amplifying the field emission of the multi-pointed semiconductor cathode. Modeling the behavior of resonant tunneling of electrons from semiconductors to vacuum was simulated by solving the one-dimensional Schrodinger’s equation, and the amplification due to resonant processes was estimated. The modeling results showed that as the electric field increases, the resonance conditions shift towards low energy levels. With the increase in the width of the barrier for the electron inside the solid body, the resonance conditions shift towards higher energies. It has been established that in onedimensional semiconductors with electrons of low conductivity width, the resonant energy coincides with the Fermi level. These cathode properties are optimal for amplifying the emission current and reducing failures of vacuum electronic devices based on semiconductive field cathodes. The proposed technique can be used to study the regularities of emission amplification due to resonant processes in multipoint semiconductor cathodes with multilayered structure and with metal tips.

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“…Although, the FE mechanisms of the nanostructured materials are still under investigation, their physically confinement structures play an important role on it. Ultra-thin dielectric coatings on the emitter and quantum well FE structure show resonant tunnelling characteristics in their FE measurements attributed to two-dimensional electron confinement effect [1][2][3][4]. Furthermore, one-dimensional nanostructure such as carbon nanotubes and various types of nanowires achieve an emission current at extremely low applied electric fields (typically less than 5 V/µm) [5][6][7].…”

Section: Nanostructured Materials Not Only Have Unique Physical and Cmentioning

confidence: 99%

Electron Field Emission Properties of Co Quantum Dots in SiO2 Matrix Synthesised by Ion Implantation

Tsang

Stolojan

Sealy

et al. 2006

2006 19th International Vacuum Nanoelectronics Conference

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In this work, Co ions were implanted onto thermally oxidised SiO 2 layers on silicon substrates. The implantation energy was 50 keV and the doses were 1, 3, 5 and 7×10 16 Co + /cm 2 . The field emission (FE) properties of these layers were studied and correlated with results from atomic force microscopy and transmission electron microscopy measurements. Except for the lowest dose sample, crystallised Co nanoclusters, with size ranging from 1.8 to 5.7 nm, are observed in these Co implanted layers. The higher dose samples exhibit excellent FE properties and give an emission current of 1 nA at electric fields as low as 5 V/µm, for a dose of 5×10 16 Co + /cm 2 compared with 120 V/µm for the lowest dose samples. It is clearly demonstrated that the excellent FE properties of these layers are attributed to the formation of Co nanoclusters as the electrical inhomogeneity local field enhancement effect. Finally, repeatable staircase current-field (I-F) characteristics were observed in FE measurements of these higher dose samples as compared to conventional Fowler-Nordheim type I-F characteristics in lowest dose sample. It is possibly attributed to Coulomb blockade effect arising from the isolated metal quantum dots.2

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Experimental evidence of resonant field emission from ultrathin amorphous diamond thin film

Cited by 11 publications

References 7 publications

Two-step electron tunneling from confined electronic states in a nanoparticle

Two-step electron tunneling from confined electronic states in a nanoparticle

Multi-Pointed Field-Emission Cathode as a Generator of Highfrequency Oscillations

Electron Field Emission Properties of Co Quantum Dots in SiO2 Matrix Synthesised by Ion Implantation

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