18 Questions
What is the charge of a hole in a semiconductor?
Positive
What is the purpose of doping in semiconductors?
Control electronic properties
What happens to covalent bonds in a semiconductor when thermal energy is applied?
Breaks bonds
What is the notation used for electron density in Semiconductor Physics?
n
What is the energy unit typically used to measure thermal energy?
Kelvins
What is the condition called when the rate of electron-hole generation equals the rate of recombination in a semiconductor?
Generation-recombination equilibrium
What is the constant that represents the mobility of holes in semiconductors?
Hole mobility
What happens to the mobility of charge carriers with an increase in doping (n-type or p-type) in semiconductors?
It decreases
What is the physical quantity that describes how much current flows when an electric field is applied in a semiconductor?
Conductivity
Which equation relates the ratio of resistivity to conductivity in semiconductors?
Einstein's Relation
What is the mechanism by which current flows in semiconductors due to non-uniform carrier densities?
Diffusion
What are the two material constants related to carrier transport as introduced by Einstein?
Mobility and diffusivity
In a P-doped semiconductor, what is the correct relationship between the doping density and Φ?
Φ is directly proportional to the doping density
In a semiconductor, what is the correct statement about the generation of electrons and holes by photons?
Electrons and holes are generated in pairs by photons
What is the correct equation that describes the behavior of electrons and holes in semiconductors?
Rate = G + R
In a P-doped semiconductor, what is the correct statement about the role of electrons?
Electrons are the minority carriers
When turning off light in a semiconductor where electrons and holes were previously generated, how does thermal equilibrium get restored?
Excess carriers decay exponentially
What is the correct statement about the solution for excess minority carriers in semiconductor recombination?
It decays exponentially to zero
Test your knowledge on semiconductor charges, mean free path for electrons, hole mobility, and carrier mobility in doped semiconductors. Choose the correct options for the given questions to see how well you understand these key concepts.
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