Question

When temperature increases, the energy bandgap of a semiconductor?

• A. Decreases
• B. Does not change
• C. Increases
• D. Almost zero

Hint:

Keep in mind that the relationship between temperature and the bandgap of a semiconductor is an important factor in its electrical properties. A smaller bandgap leads to better conductivity.

Answer 1

The Correct Option is A

For a semiconductor, the energy bandgap decreases as the temperature increases. This phenomenon is due to the increased thermal energy, which allows electrons to overcome the bandgap more easily. As temperature increases, more electrons can jump from the valence band to the conduction band, reducing the effective bandgap. This behavior is typical for most semiconductors, where the bandgap shrinks with increasing temperature, making the material more conductive.
- Decreases: This is the correct answer because the bandgap energy reduces with temperature, increasing the conductivity of the semiconductor.
- Does not change: This is incorrect. The bandgap does change with temperature.
- Increases: This is incorrect because the bandgap decreases, not increases, with temperature.
- Almost zero: This is incorrect because the bandgap never reaches zero in practical conditions for typical semiconductors, though it does decrease with temperature.
Thus, the correct response is that the energy bandgap decreases with an increase in temperature.