Diodes are made from semiconductor materials, mainly silicon, with various compounds (combinations of more than one element) and metals added depending on the function of the diode. Early types of semiconductor diodes were made from Selenium and Germanium, but these diode types have been almost totally replaced by more modern silicon designs.
Once the voltage applied to the anode is made more positive than the cathode by an amount greater than the depletion layer potential, forward conduction from anode to cathode conventional current commences.
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