Laser Interaction with Matter: Light Effect on Semiconductor Surfaces

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10 Questions

What is the condition for photoexcitation to occur in a semiconductor material?

When the energy of the photons is greater than the bandgap energy of the material

What is the effect of increasing the temperature of a semiconductor material on its electrical conductivity?

It increases due to an increase in the thermal energy of the charge carriers

What is the formula to calculate the energy of a photon?

E = hc/λ

What is the effect of the level of doping on the absorptivity of a semiconductor material in the region of the band gap?

It strongly depends on the level of doping

What is the minimum energy required to excite an electron in a semiconductor material?

The bandgap energy of the material

What is the term used to describe the increase in the number of charge carriers available for conduction due to an increase in the thermal energy of the charge carriers?

Thermally generated carriers

What happens to the electrical conductivity of a semiconductor material as the temperature increases?

It increases due to an increase in the number of charge carriers

What is the relationship between the wavelength of light and the energy of the photons?

The energy of the photons is inversely proportional to the wavelength of light

What is the effect of light on the electrical conductivity of a semiconductor material?

It increases the electrical conductivity due to the generation of charge carriers

What is the term used to describe the phenomenon where light is absorbed by a semiconductor material, leading to the generation of charge carriers?

Photoexcitation

This quiz covers the interaction of light with semiconductor surfaces, including the properties of semiconductor materials and their electrical conductivity. It is a part of the Laser Interaction with Matter course at Beni-Suef University.

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