Maximizing the performance of a field emission device by profiling the emitter’s height distribution

Author:

Filippov Sergey V.1ORCID,Dall’Agnol Fernando F.2ORCID,Popov Eugeni O.1ORCID,Kolosko Anatoly G.1ORCID,de Assis Thiago A.34ORCID

Affiliation:

1. Ioffe Institute 1 , 26 Politekhnicheskaya, St. Petersburg 194021, Russia

2. Department of Exact Sciences and Education (CEE), Universidade Federal de Santa Catarina 2 , Campus Blumenau, Rua João Pessoa, 2514, Velha, Blumenau, Santa Catarina 89036-004, Brazil

3. Instituto de Física, Universidade Federal da Bahia, Campus Universitário da Federação 3 , Rua Barão de Jeremoabo s/n, Salvador, Bahia 40170-115, Brazil

4. Instituto de Física, Universidade Federal Fluminense 4 , Avenida Litorânea s/n, Niterói, Rio de Janeiro 24210-340, Brazil

Abstract

Electrostatic depolarization in clusters of emitters regularly spaced and with uniform height causes the emission to concentrate on the outer corners, suppressing the relative emission contribution from center emitters. In this Letter, we performed extensive three-dimensional computer simulations to show that profiling the height distribution of the emitters significantly compensates for the electrostatic depolarization and homogenizes the emitted current per emitter. Importantly, a minimum standard deviation on the currents from individual emitters shows the route to find the ellipsoidal height profile to achieve optimized conditions. This implies a maximized macroscopic current extractable from the device since every emitter contributes approximately the same before burning out. Our findings are expected to guide developments on new field electron emission devices.

Funder

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro

Publisher

American Vacuum Society

Subject

Materials Chemistry,Electrical and Electronic Engineering,Surfaces, Coatings and Films,Process Chemistry and Technology,Instrumentation,Electronic, Optical and Magnetic Materials

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