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On the capacitance-voltage modeling of strained quantum-well MODFETs

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3 Author(s)
Manzoli, J.E. ; Inst. de Fisica, Sao Paulo Univ., Brazil ; Romero, M.A. ; Hipolito, O.

A theoretical model for the capacitance-voltage characteristics of strained modulation-doped field-effect transistors (MODFETs) is developed, based on a self-consistent solution of the Schrodinger and Poisson equations. We report on the first MODFET C-V simulator in which the proposed Hamiltonian takes into account the strain caused by lattice mismatch, as well as the position-dependent lattice constant and electron effective mass. It is demonstrated that the inclusion of strain-related energy terms is essential to achieve good agreement between theory and experimental data for the C-V characteristics of pseudomorphic-channel devices at high gate voltages. The model is also shown to be a useful tool to predict important device characteristics such as the transconductance

Published in:

Quantum Electronics, IEEE Journal of  (Volume:34 ,  Issue: 12 )