Hill-Coleman’s single frequency conductance technique for the determination of surface state density has been extended upto 2 kHz. A.c. conductance (Gm) and capacitance (Cm)versus gate bias (VG) curves were obtained at various signal frequencies. Shift of the observed peaks in theGm versus VG curves for different signal frequencies was utilized for the determination of surface state density at different surface potentials (φs). Determination of surface state density for differentφs values was also done by Nicollian-Goetzberger method and the results compared. Results obtained by Hill-Coleman technique compare reasonably well with those obtained by the other method.
Volume 94, 2020
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