Bonding configuration of constituent elements in fluorinated silicon nitride insulating films prepared by reactive plasma of SiF4 (or SiF2), N2, and H2 gas mixture is investigated by means of optical absorption analysis and electron-spin resonance study. Fluorine is bonded to silicon rather than to nitrogen. Slight variations of spin density and optical gap with chemical composition are attributed to the complemental increase of fluorine with decrease of nitrogen, and to the passivation of silicon dangling bonds by fluorine atoms.
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Fujita et al. (1988) studied this question.
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