A new approach to simulating n-MOSFET gate current degradation by including hot-electron induced oxide damage

Cherng Ming Yih*, Shui Ming Cheng, Steve S. Chung

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

A new gate current model which considers the hot-electron induced oxide damage in n-MOSFET's was developed for the first time. The spatial distributions of oxide damage, including the interface state (N it) and oxide trapped charge (Q ox), were characterized by using an improved gated-diode current measurement technique. A numerical model feasible for accurately simulating gate current degradation due to the stress generated N it and Q ox has thus been proposed. Furthermore, the individual contributions of N it and Q ox to the degradation of gate current can thus be calculated separately using these oxide damage. For devices stressed under maximum gate current biases, it was found that the interface state will degrade the gate current more seriously than that of the oxide trapped charge. In other words, the interface states will dominate the gate current degradation under I G,max. Good agreement of the simulated gate current has been achieved by comparing with the measured data for pre-stressed and post-stressed devices. Finally, the proposed degradation model is not only useful for predicting the gate current after the hot-electron stress, but also provides a monitor that is superior to substrate current for submicron device reliability applications, in particular for EPROM and Flash EEPROM devices.

Original languageEnglish
Pages (from-to)2343-2348
Number of pages6
JournalIEEE Transactions on Electron Devices
Volume45
Issue number11
DOIs
StatePublished - 1 Dec 1998

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