Depletion Region & Junction Capacitance
How the charge-free zone at a semiconductor junction behaves electrically like a voltage-tunable capacitor.
References
- Kennedy, D.P., Murley, P.C., Kleinfelder, W. "On the Measurement of Impurity Atom Distributions in Silicon by the Differential Capacitance Technique." IBM Journal of Research and Development 12, no. 5 (1968): 399–409.