Laser Interaction with Matter: Light Effect on Semiconductor Surfaces

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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 (correct)

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

When the energy of the photons is equal to the bandgap energy of the material

When the energy of the photons is half of 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 (correct)

It remains constant as the temperature has no effect on the charge carriers

It decreases due to a decrease in the thermal energy of the charge carriers

It has a variable effect depending on the type of semiconductor material

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

E = hc/λ (correct)

E = hc^2/λ

E = hc - λ

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 Signup and view all the answers

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

The bandgap energy of the material Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

Laser Interaction with Matter: Light Effect on Semiconductor Surfaces

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Questions and Answers

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

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

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

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

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

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

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

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

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

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