Carrier movement and concentration Flashcards

1
Q

What is drift current?

A

current caused by an external electric field, where charge carriers (electrons and holes) move based on their charge.

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2
Q

What is diffusion current?

A

current arising from a non-uniform distribution of charge carriers, leading them to move from regions of high concentration to low concentration.

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3
Q

What is carrier density/concentration?

A

The number of charge carriers (electrons or holes) per unit volume.

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4
Q

Why is current density preferred over current?

A

current density is independent of the material’s geometry

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5
Q

What are the formulae for current density J?

A

J=I/A, J=-qnv

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6
Q

How do we figure out the amount of current flowing in a semiconductor?

A

we need to know the Density of States, and the Fermi-Dirac probability function

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7
Q

What is the Fermi-Dirac function?

A

the probability of finding an electron in an energy state

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8
Q

What is the Density of States?

A

the number of available quantum states per unit volume per unit energy in an energy band.

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