Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > The electrical resistivity of –a)Intrin... Start Learning for Free
The electrical resistivity of –
- a)Intrinsic semiconductor decreases with increases of temperature
- b)Intrinsic semiconductor increases with increases of temperature
- c)Metals in independent of temperature
- d)Metals decreases with increasing temperature
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The electrical resistivity of –a)Intrinsic semiconductor decreas...
Understanding Electrical Resistivity in Intrinsic Semiconductors
Electrical resistivity is a fundamental property that indicates how strongly a material opposes the flow of electric current. The behavior of intrinsic semiconductors with respect to temperature is crucial in understanding their applications in electronics.
Intrinsic Semiconductors and Temperature Effects
- Decreased Resistivity with Increased Temperature:
- In intrinsic semiconductors, as temperature rises, thermal energy excites electrons from the valence band to the conduction band.
- This excitation generates more charge carriers (electrons and holes), enhancing conductivity and thereby reducing resistivity.
- Key Mechanism:
- At higher temperatures, the increased thermal agitation allows more electrons to break free from their covalent bonds.
- This leads to a higher concentration of free charge carriers, which facilitates the movement of electric current.
Contrast with Metals
- Metals and Temperature:
- In contrast, for metals, resistivity typically increases with temperature.
- The increased thermal vibrations of atoms in the metal lattice impede the flow of electrons, leading to higher resistivity.
Conclusion
The behavior of intrinsic semiconductors is characterized by a decrease in resistivity with increasing temperature due to the generation of more charge carriers. This phenomenon is critical in semiconductor applications, such as diodes and transistors, where controlling electrical properties through temperature variations is essential. Understanding these principles helps in designing and optimizing electronic devices.
Electrical resistivity is a fundamental property that indicates how strongly a material opposes the flow of electric current. The behavior of intrinsic semiconductors with respect to temperature is crucial in understanding their applications in electronics.
Intrinsic Semiconductors and Temperature Effects
- Decreased Resistivity with Increased Temperature:
- In intrinsic semiconductors, as temperature rises, thermal energy excites electrons from the valence band to the conduction band.
- This excitation generates more charge carriers (electrons and holes), enhancing conductivity and thereby reducing resistivity.
- Key Mechanism:
- At higher temperatures, the increased thermal agitation allows more electrons to break free from their covalent bonds.
- This leads to a higher concentration of free charge carriers, which facilitates the movement of electric current.
Contrast with Metals
- Metals and Temperature:
- In contrast, for metals, resistivity typically increases with temperature.
- The increased thermal vibrations of atoms in the metal lattice impede the flow of electrons, leading to higher resistivity.
Conclusion
The behavior of intrinsic semiconductors is characterized by a decrease in resistivity with increasing temperature due to the generation of more charge carriers. This phenomenon is critical in semiconductor applications, such as diodes and transistors, where controlling electrical properties through temperature variations is essential. Understanding these principles helps in designing and optimizing electronic devices.
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The electrical resistivity of –a)Intrinsic semiconductor decreas...
Intrinsic semiconductors are not a conductivity
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