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