Semi-Conductors

Holes are the majority carriers in P-type semiconductors (True/False)

True, holes are created when positive charge carriers are introduced in the semiconductor material, making them the predominant charge carriers.

When an electric field is applied, in which direction do the holes in the crystal structure move?

Holes move in the direction of the electric field, towards the negative terminal.

Which of the following is true about bandgaps in semiconductors?

Bandgaps determine the energy required for electrons to move from the valence band to the conduction band.

What factors increases the conductivity of a semiconductor?

Increasing Temperature

Decreasing the band gap

Increasing the number of charge carriers

Increasing the doping concentration

In a forward-biased PN junction, the depletion region widens (True or False)

False. In a forward-biased PN junction, the depletion region narrows, allowing current to flow.

In an intrinsic semiconductor, the number of electrons equals the number of holes (True or False)

True. In an intrinsic semiconductor, the number of charge carriers, electrons and holes, are equal, resulting in neutral charge overall.

At 0 K, the Fermi level for an intrinsic semiconductor moves towards the conduction band, resulting in superconductivity (True or False)

False. At 0 K, the Fermi level for an intrinsic semiconductor is located in the middle of the band gap, and superconductivity is a phenomenon that typically occurs in certain materials under specific conditions.

A semiconductor's performance is not temperature dependent. (True/False)

False. A semiconductor's performance is highly temperature dependent, with its conductivity increasing as temperature rises due to greater carrier excitation.

Which of the following correctly describes an intrinsic semiconductor? (More than one answer)

An intrinsic semiconductor is a pure semiconductor without any significant dopant atoms present. It exhibits equal numbers of electrons and holes, and its electrical properties are largely determined by temperature.

The Fermi level in an N-type semiconductor lies closer to the conduction band. (True or false)

True. In an N-type semiconductor, the Fermi level is closer to the conduction band due to the presence of additional electrons from donor impurities.

A light-emitting diode (LED) emits light by combining electrons with holes. (True/False)

True. A light-emitting diode (LED) emits light when electrons recombine with holes in the semiconductor material, releasing energy in the form of photons.

The electrical conductivity of an electrical semiconductor increases with temperature in: