A PN-junction has a thickness of the order of :

1 g m

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1 m m

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1 μ m

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1 p m

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Solution

The correct option is A $1 μ m$
$P - N$ Junction or depletion region is the area between $P -$ type and $N -$ type semiconductors; which is free from charge carriers.
This region between the two arts as a barrier and has a very small width $\approx 10^{- 6} m$
or
$1 μ m$

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