Question:
An n-type semiconductor is formed
An n-type semiconductor is formed
Updated On: Jul 6, 2022
- when germanium crystal is doped with an impurity containing 3 valence electrons
- when germanium crystal is doped with an impurity containing 5 valence electrons
- from pure germanium
- from pure silicon
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The Correct Option is B
Solution and Explanation
Pentavalent impurity atom i.e., atoms having 5 valence electrons such as antimony (Sb) or arsenic (As), when added to a pure semiconductor, produce excess of free electrons i.e., donor electrons to the semiconductor. For this reason, pentavalent impurity atoms are called donor impurity atom. The semiconductor so produced is called n-type extrinsic semiconductor
So the corresponding wavelength is equal to,
$ \, \, \, \, \lambda=\frac{hc}{E} =\frac{6.67 \times 10^{-34} \times 3 \times 10^{8}}{1.5 \times 1.6 \times 10^{-19}}$
$ \, \, \, \, \, \, \, =8.3375 \times 10^{-26} \times 10^{19} =8337.5 \mathring{A}$
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Notes on Semiconductor electronics: materials, devices and simple circuits
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.