Interplay of current crowding and current self-quenching effects in planar cold cathodes

Modukuru, Y.; Cahay, M.

doi:10.1116/1.1415515

Cited by 2 publications

(2 citation statements)

References 9 publications

(11 reference statements)

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“…With enough forward bias on the emitter fingers, electrons emitted from the InP substrate tunnel through the CdS layer and are emitted into vacuum as a result of NEA at the CdS/LaS interface. However, there can be partial trapping of electrons by the LaS semimetallic thin film, which can lead to a lateral current flow and current crowding 11,12 and self-heating effects 13 in the cathode.…”

Section: Our Work Was Motivated By the Original Proposal By Walter Frmentioning

confidence: 99%

Review Article: Rare-earth monosulfides as durable and efficient cold cathodes

Cahay¹,

Fairchild²,

Grazulis³

et al. 2011

Journal of Vacuum Science & Technology B, Nanotechnology an

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In their rocksalt structure, rare-earth monosulfides offer a more stable alternative to alkali metals to attain low or negative electron affinity when deposited on various III-V and II-2 VI semiconductor surfaces. In this article, we first describe the successful deposition of Lanthanum Monosulfide (LaS) via pulsed laser deposition on Si and MgO substrates and alumina templates. These thin films have been characterized by X-ray diffraction, atomic force microscopy, high resolution transmission electron microscopy, ellipsometry, Raman spectroscopy, ultraviolet photoelectron spectroscopy and Kelvin probe measurements. For both LaS/Si and LaS/MgO thin films, the effective work function of the submicron thick thin films was determined to be about 1 eV from field emission measurements using the Scanning Anode Field Emission Microscopy technique. The physical reasons for these highly desirable low work function properties were explained using a patchwork field emission model of the emitting surface. In this model, nanocrystals of low work function materials having a <100> orientation perpendicular to the surface and outcropping it are surrounded by a matrix of amorphous materials with higher work function. To date, LaS thin films have been used successfully as cold cathode emitters with measured emitted current densities as high as 50 A/cm 2 . Finally, we describe the successful growth of LaS thin films on InP substrates and, more recently, the production of LaS nanoballs and nanoclusters using Pulsed Laser Ablation.3

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Section: Our Work Was Motivated By the Original Proposal By Walter Frmentioning

confidence: 99%

Review Article: Rare-earth monosulfides as durable and efficient cold cathodes

Cahay¹,

Fairchild²,

Grazulis³

et al. 2011

Journal of Vacuum Science & Technology B, Nanotechnology an

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“…II, we develop a small ac signal equivalent circuit of the InP/CdS/LaS cold cathode structure depicted in Fig. 15 If we call W E Ј the width of the Au fingers on either sides of the emission window and W E the width of the emission window, the amount of base current is then simply given by A small signal equivalent circuit of the cathode is derived.…”

Section: Introductionmentioning

confidence: 99%

Electron beam prebunching in planar cold cathodes with surface current carrying thin films

Krishnan

Cahay

2004

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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Onset of current self-quenching in a metal/CdS/LaS cold cathode in the presence of inelastic scattering in the CdS layer Space-charge effects and current self-quenching in a metal/CdS/LaS cold cathode Electron beam prebunching by direct modulation of the electron current density emitted into vacuum is one of the potential advantages of cold cathodes. We develop a small alternating current signal equivalent circuit of planar cold cathode with negative electron affinity and current carrying thin films at the surface. For a specific InP/CdS/LaS cold cathode, device parameters and biasing conditions are found leading to large ͑60%͒ cathode current modulation at a frequency well within the K band.

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Interplay of current crowding and current self-quenching effects in planar cold cathodes

Cited by 2 publications

References 9 publications

Review Article: Rare-earth monosulfides as durable and efficient cold cathodes

Review Article: Rare-earth monosulfides as durable and efficient cold cathodes

Electron beam prebunching in planar cold cathodes with surface current carrying thin films

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