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Exercise - Quiz

Which of the following statement(s) for real diodes is/are correct?

P-doping produces quasi-free electrons
Conductivity in semiconductors happens via conduction band and valence band
The diode blocks at any negative voltage (reverse voltage).
The diode can be modeled as a voltage source and capacitor

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Exercise - Quiz

On which physical properties does the forward voltage $U_S$ depend?

temperature
current range considered
(semiconductor) material
LED color
breakdown voltage of the Z-diode

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Exercise - Quiz

Which statement(s) about the junction is/are correct?

There is no electric field in the junction
The junction does not contain free charge carriers
The junction becomes larger when current is passed through it
Electron-hole pairs are created in the junction by photons
The junction is enlarged in the Schottky diode compared to the PN diode
The junction forms a capacitor

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Exercise - Quiz

The forward voltage …

… for silicon is fixed about 0.6 … 0.7 V
… serves to allow electrons to cross the bandgap
… depends on the current range under consideration
… is smaller for germanium diodes than for silicon diodes.

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Exercise - Quiz

Statements about the conduction/valence band

Photon capture can move electrons from the conduction band to the valence band
"Recombination" removes an electron from the valence band and a hole from the conduction band
A donor creates one or more quasi-free electrons
The band gap indicates the maximum energetic distance between the conduction and valence bands

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Exercise - Quiz

The forward current …

… Is dependent on the temperature
… depends on the forward voltage
… is logarithmic concerning the forward voltage
… depends on the reverse voltage

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