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The thermal equilibrium concentration of the electrons in the conduction band and the holes in the valence band depends upon?
- a)Effective density of states
- b)Fermi energy level
- c)Both A and B
- d)Neither A nor B
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
The thermal equilibrium concentration of the electrons in the conducti...
The electrons and holes depends upon the effective density of the states and the Fermi energy level given by the formula,
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The thermal equilibrium concentration of the electrons in the conducti...
Thermal Equilibrium Concentration in Semiconductors
Thermal equilibrium concentration of the electrons in the conduction band and the holes in the valence band of a semiconductor depends on two important factors - effective density of states and Fermi energy level.
Effective Density of States
The effective density of states is the number of energy states that are available in the conduction and valence bands of a semiconductor. This factor determines how many electrons or holes can occupy the bands at a given temperature. The effective density of states depends on the material properties of the semiconductor, such as the bandgap and crystal structure.
Fermi Energy Level
The Fermi energy level is the energy level at which the probability of finding an electron is exactly 50%. This level determines the distribution of electrons and holes in the conduction and valence bands. At thermal equilibrium, the Fermi energy level is constant throughout the material.
Both Factors are Important
Both effective density of states and Fermi energy level are important in determining the thermal equilibrium concentration of electrons and holes in a semiconductor. The effective density of states determines the number of energy states available for electrons and holes to occupy, while the Fermi energy level determines the probability of finding electrons and holes at a given energy level.
Conclusion
In conclusion, the correct answer to the question is option C - Both A and B. The thermal equilibrium concentration of electrons and holes in a semiconductor is determined by both the effective density of states and the Fermi energy level. Understanding these factors is essential for designing and analyzing semiconductor devices.
Thermal equilibrium concentration of the electrons in the conduction band and the holes in the valence band of a semiconductor depends on two important factors - effective density of states and Fermi energy level.
Effective Density of States
The effective density of states is the number of energy states that are available in the conduction and valence bands of a semiconductor. This factor determines how many electrons or holes can occupy the bands at a given temperature. The effective density of states depends on the material properties of the semiconductor, such as the bandgap and crystal structure.
Fermi Energy Level
The Fermi energy level is the energy level at which the probability of finding an electron is exactly 50%. This level determines the distribution of electrons and holes in the conduction and valence bands. At thermal equilibrium, the Fermi energy level is constant throughout the material.
Both Factors are Important
Both effective density of states and Fermi energy level are important in determining the thermal equilibrium concentration of electrons and holes in a semiconductor. The effective density of states determines the number of energy states available for electrons and holes to occupy, while the Fermi energy level determines the probability of finding electrons and holes at a given energy level.
Conclusion
In conclusion, the correct answer to the question is option C - Both A and B. The thermal equilibrium concentration of electrons and holes in a semiconductor is determined by both the effective density of states and the Fermi energy level. Understanding these factors is essential for designing and analyzing semiconductor devices.
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