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Which one of the following options describes correctly the equilibrium band diagram at T = 300 K of a Silicon p n n +p++ configuration shown in the figure?

Which one of the following options describes correctly the equilibrium band diagram at T = 300 K of a Silicon p n n +p++ configuration shown in the figure? Correct Answer <img alt="GATE 2019 Solution Writing part 1 18 + apti May Rishi madhu.docx 21" src="//storage.googleapis.com/tb-img/production/19/05/GATE%202019%20Solution%20Writing%20part%201%20_18%20%2B%20apti%20%20May_Rishi_madhu.docx%2021.PNG" style="width: 166px; height: 117px;">

Concept:

1) Fermi level is straight/aligned at equilibrium

2) Fermi level is closer valence band for p-type semiconductor and moves into valence band for high doping

3) Fermi level is closer to conduction band for n-type material and moves into the conduction band for high doping.

Applications:

Since fermi level is not aligned in option (2) and (3). They are eliminated

For p++ region fermi-level will lie inside the valance band. Hence option (4) is eliminated.

Correction option is (1) which satisfies all properties.

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