Universität zu Köln

Bizyaev, Ivan, Gabdullin, Pavel, Chumak, Maxim, Babyuk, Vladislav, Davydov, Sergey, Osipov, Vasilii, Kuznetsov, Alexey, Kvashenkina, Olga and Arkhipov, Alexander (2021). Low-Field Electron Emission Capability of Thin Films on Flat Silicon Substrates: Experiments with Mo and General Model for Refractory Metals and Carbon. Nanomaterials, 11 (12). BASEL: MDPI. ISSN 2079-4991

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Abstract

Herein, we describe a study of the phenomenon of field-induced electron emission from thin films deposited on flat Si substrates. Films of Mo with an effective thickness of 6-10 nm showed room-temperature low-field emissivity; a 100 nA current was extracted at macroscopic field magnitudes as low as 1.4-3.7 V/mu m. This result was achieved after formation treatment of the samples by combined action of elevated temperatures (100-600 degrees C) and the electric field. Morphology of the films was assessed by AFM, SEM, and STM/STS methods before and after the emission tests. The images showed that forming treatment and emission experiments resulted in the appearance of numerous defects at the initially continuous and smooth films; in some regions, the Mo layer was found to consist of separate nanosized islets. Film structure reconstruction (dewetting) was apparently induced by emission-related factors, such as local heating and/or ion irradiation. These results were compared with our previous data obtained in experiments with carbon islet films of similar average thickness deposited onto identical substrates. On this basis, we suggest a novel model of emission mechanism that might be common for thin films of carbon and refractory metals. The model combines elements of the well-known patch field, multiple barriers, and thermoelectric models of low-macroscopic-field electron emission from electrically nanostructured heterogeneous materials.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bizyaev, Ivan UNSPECIFIED UNSPECIFIED UNSPECIFIED Gabdullin, Pavel UNSPECIFIED UNSPECIFIED UNSPECIFIED Chumak, Maxim UNSPECIFIED UNSPECIFIED UNSPECIFIED Babyuk, Vladislav UNSPECIFIED UNSPECIFIED UNSPECIFIED Davydov, Sergey UNSPECIFIED UNSPECIFIED UNSPECIFIED Osipov, Vasilii UNSPECIFIED UNSPECIFIED UNSPECIFIED Kuznetsov, Alexey UNSPECIFIED UNSPECIFIED UNSPECIFIED Kvashenkina, Olga UNSPECIFIED UNSPECIFIED UNSPECIFIED Arkhipov, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-576492
DOI:	10.3390/nano11123350
Journal or Publication Title:	Nanomaterials
Volume:	11
Number:	12
Date:	2021
Publisher:	MDPI
Place of Publication:	BASEL
ISSN:	2079-4991
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language COLD-CATHODE MATERIALS; GRAPHENE QUANTUM DOTS; RELAXATION DYNAMICS; PHONON INTERACTION; RAMAN-SCATTERING; CURRENT STATE; NANOPARTICLES; CONDUCTIVITY; SPECTROSCOPY; MECHANISM Multiple languages Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57649