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What is P and junction diode?
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Definition. A P and junction diode is a
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semiconductor device formed by joining
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AP type and an untyped semiconductor
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allowing current to flow easily in one
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direction while blocking it in the
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opposite direction. Explanation when AP
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type semiconductor with holes as
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majority carriers is joined to an
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untyped semiconductor with the electrons
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as majority carriers, a junction is
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formed at the boundary. Free electrons
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from the unside diffuse into the Pside
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and combine with holes. This creates a
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depletion region with a mobile ions and
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an electric field. The built-in
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potential barrier prevents further
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movement of carriers. If the diode is
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forward biased, positive voltage on
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Pside, negative onside, the barrier is
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reduced and current flows. If reverse
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biased, the barrier increases and almost
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no current flows except a tiny leakage
