GATE Electronics and Communications (EC) 2019 Solved Paper

Question : 12 of 65

Marks: +1, -0

Which one of the following options describes correctly the equilibrium band diagram at

{T}=300 {K}

of a Silicon

{\pnn}^{+} {\p}^{++}

configuration shown below ?

\p

\n

\n^{+}

\p^{++}

Validate

Solution:

As no supply is connected hence fermi level will be constant.
In P type semiconductor Fermi level should be closer to EV.
In N type semiconductor Fermi level should be closer to EC.
In

{P}^{++}

type semiconductor due to large doping Fermi level enters into valance band.
Hence answer is (B).

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