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In semiconductors, at the room temperature
- a)valence band is completely filled
- b)conduction band is completely empty
- c)valance band is partially empty and conduction band is partially filled
- d)valence band is completely filled and conduction band is partially filled
Correct answer is option 'C'. Can you explain this answer?
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In semiconductors, at the room temperaturea)valence band is completely...
Explanation:
Semiconductors are materials that have a conductivity between conductors (metals) and insulators (non-metals). The conductivity of a semiconductor can be controlled by adding impurities or doping. At the room temperature, the following conditions hold true for semiconductors:
Valence Band:
- The valence band is the highest energy band that is completely filled with electrons.
- The valence band consists of the valence electrons that are tightly bound to the atoms.
- At room temperature, the valence band is partially filled with electrons, but it is not completely filled.
Conduction Band:
- The conduction band is the lowest energy band that is partially filled with electrons.
- The conduction band consists of the free electrons that are not bound to any particular atom and can move freely through the material.
- At room temperature, the conduction band is partially filled with electrons, but it is not completely empty.
Energy Gap:
- The energy gap or band gap is the energy difference between the valence band and the conduction band.
- In insulators, the energy gap is very large, and no electrons can move from the valence band to the conduction band.
- In conductors, the energy gap is zero, and the valence and conduction bands overlap.
- In semiconductors, the energy gap is small, and electrons can move from the valence band to the conduction band by absorbing energy.
Conclusion:
At room temperature, semiconductors have a partially filled valence band and a partially filled conduction band. This allows them to conduct electricity, but the conductivity can be controlled by adding impurities or doping.
Semiconductors are materials that have a conductivity between conductors (metals) and insulators (non-metals). The conductivity of a semiconductor can be controlled by adding impurities or doping. At the room temperature, the following conditions hold true for semiconductors:
Valence Band:
- The valence band is the highest energy band that is completely filled with electrons.
- The valence band consists of the valence electrons that are tightly bound to the atoms.
- At room temperature, the valence band is partially filled with electrons, but it is not completely filled.
Conduction Band:
- The conduction band is the lowest energy band that is partially filled with electrons.
- The conduction band consists of the free electrons that are not bound to any particular atom and can move freely through the material.
- At room temperature, the conduction band is partially filled with electrons, but it is not completely empty.
Energy Gap:
- The energy gap or band gap is the energy difference between the valence band and the conduction band.
- In insulators, the energy gap is very large, and no electrons can move from the valence band to the conduction band.
- In conductors, the energy gap is zero, and the valence and conduction bands overlap.
- In semiconductors, the energy gap is small, and electrons can move from the valence band to the conduction band by absorbing energy.
Conclusion:
At room temperature, semiconductors have a partially filled valence band and a partially filled conduction band. This allows them to conduct electricity, but the conductivity can be controlled by adding impurities or doping.
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In semiconductors, at the room temperaturea)valence band is completely...
At room temperature, some valence electrons gain thermal energy and if the thermal energy > Energy Gap, then the valence electrons jump from valence band to the conduction band. Due to this, the valence band becomes partially empty due to the loss of some valence electrons while the conduction band becomes partially filled with electrons due to gain in electrons from the valence band.
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In semiconductors, at the room temperaturea)valence band is completely filledb)conduction band is completely emptyc)valance band is partially empty and conduction band is partially filledd)valence band is completely filled and conduction band is partially filledCorrect answer is option 'C'. Can you explain this answer?
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