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  4. Within depletion region of p-n junction of diode:

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Q. Within depletion region of p-n junction of diode:

Delhi UMET/DPMTDelhi UMET/DPMT 2006

Solution:

In a $p-n$ junction diode, electrons in conduction band on n-type side travel across the junction and leave the positively ionized impurity atoms
un neutralised. Consequently, there is positively charged region adjacent to the junction in $n$-type material.
On n-type side the electrons which have traversed the boundary recombine with positive holes in the valence band and form a layer of Unneutralised negatively ionized trivalenf impurity atoms making a negatively charge region as shown in figure.
The region around the junction is called charge depletion region or space charge region.
Hence, within the depletion region, p-side is negative and n-side is positive.

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