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The mechanism of hot-carrier-induced degradation in n-type lateral diffused metal-oxide-semiconductor (LDMOS) transistors is investigated. Experimental data reveal that hot-electron injection induced interface state generation in channel region is the main degradation mechanism. Since gate current (Ig) consists mainly of electron injection, Ig correlates well with device degradation. As a result, a lifetime prediction method based on Ig is presented for the purpose of projecting hot-carrier lifetime in LDMOS transistors.
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Chen et al. (2008) studied this question.
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