Why is the amount of impurity added to a pure semiconductor closely controlled?
Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM
Doping a pure semiconductor can have quite marked effect on the conductivity of the material. The addition of one impurity atom in one hundred million will increase the conductivity by 11 times at room temperature. Therefore the amount of impurity added has to be closely controlled during the preparation of the extrinsic semiconductor.
Answered by | 4th Jun, 2014, 03:23: PM
- Why do conductors not form holes?
- How does the addition of trivalent impurity to a pure semiconductor affect the electron hole pairs at room temperature?
- For the same degree of doping, why is the conductivity of n-type semiconductor greater than that of p-type semiconductor?
- Why is a semiconductor virtually an insulator at room temperature?
- Why are germanium and silicon preferred to other semiconductors in solid state devices?
- Why are n-type and p-type semiconductor electrically neutral?
- Why do hole carriers present in n-type semiconductor?
- The hole current is due to the movement of valence electrons from one covalent bond to another. Why is then the name hole current?
- Which of the one between silicon and germanium preferred in the manufacturing of semiconductor devices? Why?
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