Diodes I: Fundamentals of Electronics

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What is the p region of a diode called?

Conduction band

Anode (correct)

Depletion region

Cathode

Which impurities are present in the p-type material of a diode?

Trivalent (correct)

Tetravalent

Pentavalent

Hexavalent

Where do the free electrons from the n region diffuse in a diode?

Conduction band of n region (correct)

Valence band

P region

Depletion region

What is the junction between the p and n regions of a diode called?

P-N junction Signup and view all the answers

What are the energy levels of the valence and conduction bands in an n-type material compared to a p-type material?

Lower in n-type material Signup and view all the answers

What does the depletion region in a diode separate?

P and n regions Signup and view all the answers

What happens to the energy level of the n-region conduction band during the formation of the depletion region?

It decreases Signup and view all the answers

What is the condition for forward bias to allow current through the pn junction?

Negative side of VBIAS connected to p region, positive side connected to n region Signup and view all the answers

What effect does forward bias have on the depletion region?

It causes the depletion region to narrow Signup and view all the answers

What happens to the valence band energy level when the energy level of the n-region conduction band shifts downward?

It also shifts downward Signup and view all the answers

What do valence electrons in the p region do when subjected to forward bias?

Move towards the left end of the p region Signup and view all the answers

What are the majority carriers in the p region during forward bias?

Holes (p-region) Signup and view all the answers

What is the second requirement for allowing current through the pn junction under forward bias?

$VBIAS$ must be greater than the barrier potential Signup and view all the answers

What happens to the number of positive and negative ions during forward bias?

The number of positive ions is reduced and the number of negative ions is reduced Signup and view all the answers

What does forward bias allow through the pn junction?

Current Signup and view all the answers

What acts as an 'energy hill' that an n-region electron must climb in order to get to the p-region during equilibrium at the pn junction?

The electric field between positive and negative ions Signup and view all the answers

Diodes I: Fundamentals of Electronics

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