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Semiconductor Physics

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Questions and Answers

What is the purpose of writing the continuity equations for the carrier densities in the neutral zones?

To find the breakdown voltage of the PN junction

To calculate the current density as a function of the external voltage

To determine the recombination rate of carriers

To estimate the minority carriers densities in the neutral zones (correct)

What is the effect of the current density being not homogeneous in space on the carrier densities?

It increases the carrier density in the small volume

It causes a variation in the carrier density per unit time (correct)

It decreases the carrier density in the small volume

It does not affect the carrier density in the small volume

What is the physical meaning of the term $\frac{dn_p}{dt}$ in the continuity equation?

Rate of change of electron density in the P side (correct)

Rate of recombination of carriers

Rate of change of hole density in the N side

Rate of generation of carriers

What is the role of the lifetime τn (resp. τp) in the continuity equation?

It describes the rate of recombination of carriers Signup and view all the answers

What is the physical meaning of the term $L_n$ (resp. $L_p$) in the steady-state continuity equation?

Diffusion length of electrons (resp. holes) Signup and view all the answers

What is the purpose of solving the steady-state continuity equations?

To determine the minority carriers densities in the neutral zones Signup and view all the answers

What is the effect of the recombination of carriers on the carrier densities?

It decreases the carrier density Signup and view all the answers

What is the physical meaning of the term $n_p$ (resp. $p_n$) in the continuity equation?

Minority carrier density in the N side (resp. P side) Signup and view all the answers

What is the role of the term $\frac{1}{q} \frac{∂J}{∂x}$ in the continuity equation?

It describes the diffusion of carriers Signup and view all the answers

What is the purpose of considering an infinitesimally small volume of semiconductor?

To analyze the behavior of minority carriers Signup and view all the answers