Fast interface characterization of tunnel oxide MOS structures

As new gate materials become increasingly interesting in conjunction with tunnel oxides, a fast and reliable interface characterization technique becomes Indispensable. Fast turnaround times require a method which can be applied to simple test structures like planar capacitors. For the first time, we demonstrate an automatic extraction of physical oxide thickness and fiatband potential from capacitance-voltage measurements which includes quantum confinement effects and Fermi-Dirac statistics. Automatic extraction is necessary for uniformity analysis across a whole wafer. New gate materials are typically binary or ternary alloys where the interface to the gate dielectric is very sensitive to deposition parameters. Such systems are likely to show higher nonuniformities than polysilicon electrodes. An example is presented where polysilicon gates exhibit a uniformity in fiatband potential within a wafer of less than ±15 mV while a thickness variation of 0.1 nm has been observed. © 2002 IEEE.

Subjects

Capacitance measurements

Flatband potential

Oxide thickness

Quantum mechanical corrections

DDC Class

621.3: Electrical Engineering, Electronic Engineering

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Fast interface characterization of tunnel oxide MOS structures