Physics, asked by ranjithinfo4384, 1 year ago

How does the energy gap vary in a semiconductor when doped with pentavalent element

Answers

Answered by ketan5678
2

When an intrinsic semiconductor isdoped with impurity it becomes an extrinsic semiconductor. Now, the fermi level will have to move away from it's mid-gap position inorder to conserve the number of particles as well as to maintain the electrical charge neutrality. In an n-typesemiconductor, energy gap decreases

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Answered by SansaS
1

Answer:

The energy gap decreases in an intrinsic semiconductor when doped with penta- valent impurity.

Explanation:

When we add n-type or pentavalent impurities to the intrinsic semiconductor, the width of forbidden energy gap is reduced.

Due to the addition of donor atoms, allowable energy levels are introduced at a small distance below the conduction band. These new allowable energy levels are discrete .The forbidden gap(Eg) is only 0.01  eV of Ge and 0.05 eV for Si at room temperature.

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