When the power diode is conducting in the forward direction, some excess charge carriers are stored in the device these charge carriers are mainly due to the minority carriers.
When diode is switching from ON state to OFF state these carriers are still present in the device even after the anode current zero. In order to remove these excess charge carriers and to regain equilibrium state recombination takes place and hence reverse current flows in the device untill all the excess charge carriers are completely removed in the device.This process is known as reverse recovery process.If we reduce the reverse recovery time process, we can improve the switching(ON to OFF) process time.Practically for reducing reverse recovery time by introducing GOLD, it increase the recombination rate in the diode.
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