Colloque C6, supplgment au nO1l, Tome 49, novembre 1988. EFFECT OF LACOMIT FILMS ON COLD-CATHODE HOT-ELECTRON EMISSION. M.S. MOUSA.
JOURNAL DE PHYSIQUE Colloque C6, supplgment au nO1l, Tome 49, novembre 1988
EFFECT OF LACOMIT FILMS ON COLD-CATHODE HOT-ELECTRON EMISSION
M.S.
MOUSA
Department of Natural Sciences, PO Box 7, Mu'tah University, Al-Karak. Jordan
Abstract The effect of lacomit dielectric films on the emission properties of microemitters It is observed that such films enhance field electron emission from metal-insulator-vacuum (M-I-V) microstructures. It is found that this cathode switcheshas been studied
.
on at low applied fields and acquires a subsequent reversible I-V characteristics and reasonably stable emission currents. Energy distribution measurements performed with a retarding potential energy analyser and with a high resolution electrostatic deflection electron energy analyser show that the distribution is broadened and shifted significantly to lower energy. These characteristics have been qualitatively explained in terms of a hot-electron emission mechanism.
1.
Introduction The use of electron emitting cathode devices operating in the field emission mode has seen growing interest during the past decade,more than electron emitters operatingin thermal mode
. A
primary
advantage that can be obtained by operating in the field mode[l,2]
is the
absence of a heater which simplifies the tube technology and allows instant operation, i.e. no warming up period is required The technological advantages of field emission electron sources,and its superior performance to the thermionic electron sources are well known[3].
.
Original experimental studies of field emitter materials consisted of thanum hexaboride [6,7] and carbon fibres [8,91.
tungsten [4,51, lan-
Recent experimental work [ID-131 has shown rising interest in the development of composite field emitters. It is well established [14,15] that some dielectric materials such as carbon, in certain forms, e.g. graphite, can promote the field emission of electrons at low ) deposited on the surface of a planar electrode [16,17]. fields (
