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In intrinsic semiconductor at room temperature, the number of electrons and holes are:
- a)Equal
- b)Zero
- c)Number of electrons is more than number of holes
- d)Number of holes is more than number of electrons
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
In intrinsic semiconductor at room temperature, the number of electron...
- Intrinsic semiconductors are made of pure elements.
- Since no impurity is mixed in the intrinsic semiconductors, so the numbers of electrons and holes remain equal in an intrinsic semiconductor.
Hence, option 1 is correct.
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In intrinsic semiconductor at room temperature, the number of electron...
Understanding Intrinsic Semiconductors
Intrinsic semiconductors are pure forms of semiconductor materials, such as silicon or germanium, without any significant impurities. At room temperature, the behavior of these materials can be explained in terms of charge carriers: electrons and holes.
Equal Number of Electrons and Holes
- In an intrinsic semiconductor, when thermal energy is provided (like at room temperature), some electrons gain enough energy to jump from the valence band to the conduction band.
- Each time an electron moves to the conduction band, it leaves behind a vacant state in the valence band, known as a "hole."
- This process creates an equal number of free electrons and holes, leading to the conclusion that:
- **Number of Electrons = Number of Holes**
Charge Carrier Concentration
- The concentration of charge carriers in intrinsic semiconductors is determined by the intrinsic carrier concentration, denoted as "n_i," which is equal for both electrons (n) and holes (p).
- Mathematically, this is represented as:
- **n = p = n_i**
- At equilibrium, the material maintains charge neutrality because the positive charge of holes balances the negative charge of electrons.
Conclusion
- Therefore, in intrinsic semiconductors at room temperature, the number of electrons and holes is equal, confirming that the correct answer is option 'A'.
- This balance is fundamental to understanding the electrical properties of semiconductors, which form the basis for various electronic devices.
Intrinsic semiconductors are pure forms of semiconductor materials, such as silicon or germanium, without any significant impurities. At room temperature, the behavior of these materials can be explained in terms of charge carriers: electrons and holes.
Equal Number of Electrons and Holes
- In an intrinsic semiconductor, when thermal energy is provided (like at room temperature), some electrons gain enough energy to jump from the valence band to the conduction band.
- Each time an electron moves to the conduction band, it leaves behind a vacant state in the valence band, known as a "hole."
- This process creates an equal number of free electrons and holes, leading to the conclusion that:
- **Number of Electrons = Number of Holes**
Charge Carrier Concentration
- The concentration of charge carriers in intrinsic semiconductors is determined by the intrinsic carrier concentration, denoted as "n_i," which is equal for both electrons (n) and holes (p).
- Mathematically, this is represented as:
- **n = p = n_i**
- At equilibrium, the material maintains charge neutrality because the positive charge of holes balances the negative charge of electrons.
Conclusion
- Therefore, in intrinsic semiconductors at room temperature, the number of electrons and holes is equal, confirming that the correct answer is option 'A'.
- This balance is fundamental to understanding the electrical properties of semiconductors, which form the basis for various electronic devices.
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In intrinsic semiconductor at room temperature, the number of electrons and holes are:a)Equalb)Zeroc)Number of electrons is more than number of holesd)Number of holes is more than number of electronsCorrect answer is option 'A'. Can you explain this answer?
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