Flatband Potentials and Donor Densities of Polycrystalline α ‐ Fe2 O 3 Determined from Mott‐Schottky Plots

Capacitance and conductivity measurements were made on high purity and in liquid junction cells. Flatband potentials and donor densities were determined from Mott‐Schottky plots and evidence for deep and shallow donors is presented. Potentials of zero photocurrent were determined using chopped light and were in excellent agreement in basic solution with flatband potentials calculated from 1 kHz capacitance measurements.