Question:
Which of the following statements is true for an n-type semiconductor?
Which of the following statements is true for an n-type semiconductor?
Updated On: Jun 20, 2022
- The donor level lies closely below the bottom of the conduction band
- The donor level lies closely above the top of the valence band
- The donor level lies at the halfway mark of the forbidden energy gap
- None of the above
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The Correct Option is A
Solution and Explanation
The donor level is found only in n-type semiconductors. The donor level lies closely below the bottom of the conduction band. In the figure shown, below conduction band there are $ {{N}_{d}} $ donor levels per $ c{{m}^{3}} $ of energy $ {{E}_{i}} $ At low temperatures, small fraction of donors will be ionised and practically all donor levels will be filled with electrons.
Note: $ \Delta E=({{E}_{C}}-{{E}_{i}}) $ is called as ionisation energy of donors.
Note: $ \Delta E=({{E}_{C}}-{{E}_{i}}) $ is called as ionisation energy of donors.
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Concepts Used:
Semiconductors
Semiconductors are a crystalline solid materials, whose electrical conductivity lies between a conductor and an insulator. Semiconductors are mainly used in the manufacturing of electronic devices like capacitors, transistors, diodes, Integrated circuits, etc.
Properties of Semiconductor:
- Semiconductor acts like an insulator at Zero Kelvin. On increasing the temperature, it works as a conductor.
- Due to their exceptional electrical properties, semiconductors can be modified by doping to make semiconductor devices suitable for energy conversion, switches, and amplifiers.
- Lesser power losses.
Uses of Semiconductor:
- Semiconductors are widely used in manufacturing electronics devices like transistors, diodes, sensors, integrated circuits.
- Semiconductors are widely used in all electronic devices, like mobile phones, digital cameras, communication devices, trains, ATMs, etc.