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What is a diode? Definition. A diode is
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a semiconductor device that allows
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electric current to flow in one
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direction forward while blocking it in
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the opposite direction reverse.
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Explanation. A diode is made by joining
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a ptype semiconductor holes as majority
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carriers with an untyped semiconductor
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electrons as majority carriers to form a
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P and junction. At the junction a
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depletion region is created that acts
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like a barrier. In forward bias positive
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voltage on P side negative on unside the
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barrier reduces and current flows. In
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reverse bias positive on unside negative
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on Pside the barrier increases and
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almost no current flows except a tiny
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leakage. Thus, the diode works like an
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eel electronic one-way valve.
