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Equivalent circuit for an arbitrary device with additional space charges.
Exemplary reactance spectra of two RC combinations (dashed and dotted) and their sum (solid).
(Color online) Reactance spectra of the sample for different DC bias voltages (voltage step ). For a better comprehension, positive () and negative () bias voltage variations are displayed separately. Dashed arrows indicate the dependence of reactance peaks on increasing DC voltage.
(Color online) Mott-Schottky plots calculated from the reactance spectra using a one-frequency method (circles), the two-frequency method with two different frequency choices (open and solid squares), and a simple peak evaluation of the impedance spectra according to our technique (blue triangles). Deviations from the expected linear behavior around are caused by incorrect capacitance values due to simultaneous impact of both Schottky contacts. A corrected behavior is estimated due to the reactance spectra.
Comparison of resulting acceptor concentrations from single-frequency and two-frequency A and B analysis of the impedance and our method using impedance spectroscopy. All linear fits are performed at higher voltages () for positive and negative DC voltages. The value from Hall effect measurements is used as a reference.
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