Chemistry Reference
In-Depth Information
potential region exhibits a capacitive loop characteristic of the space charge layer. For
n
-Si, the applied potential, up to tens of volts depending on doping level and HF con-
centration, drops entirely across the space charge layer. Illumination greatly reduces
the semicircles of loop I due to a larger capacitance associated with a thinner space
charge layer resulted from photo abosorption.
295
At potentials more positive than the second current plateau, (see Fig. 5.2),
where current oscillation occurs the impedance diagram is dominated by a set of loops
characteristic of resonant behavior as shown in Fig. 5.35.
951
