Impact Ionization and Hot-Electron Injection Derived Consistently from Boltzmann Transport
We develop a quantitative model of the impact-ionizationand hot-electron–injection processes in MOS devices from first principles. We begin by modeling hot-electron transport in the drain-to-channel depletion region using the spatially varying Boltzmann transport equation, and we analytically find a self consistent distribution function in a two step process. From the electron distribution function, we calculate the probabilities of impact ionization and hot-electron injection as functions of channel current, drain voltage, and floating-gate voltage. We compare our analytical model results to measurements in long-channel devices. The model simultaneously fits both the hot-electron- injection and impact-ionization data. These analytical results yield an energydependent impact-ionization collision rate that is consistent with numerically calculated collision rates reported in the literature.
Additional Information© 1998 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (Received 28 May 1997) We thank K. Hess for several helpful comments and suggestions, and L. Dupre for editing this manuscript. Fifth International Workshop on Computational Electronics (IWCE-5), University of Notre Dame, South Bend, IN, May 28-30, 1997. Special issue, VLSI Design, vol. 8, nos. 1-4, http://www.hindawi.com/journals/vlsi/volume-8/
Published - HASvd98.pdf