An?intrinsic semiconductor?is an undoped semiconductor. This means that holes in the valence band are vacancies created by electrons that have been thermally excited to the conduction band, as opposed to doped?semiconductors?where holes or electrons are supplied by a ?foreign? atom acting as an impurity.
5) In a pure, or intrinsic, semiconductor, valence band holes and conduction-band electrons are always present
Answer is:
such that number of electrons is greater than the number of holes
Explanation:
Related Electronic Devices and Communication MCQ with Answers
Answer is:
None of these
Explanation:
Doping?is the process of adding impurities to intrinsic semiconductors?to alter their properties. Normally Trivalent and Pentavalent elements are used to dope Silicon and Germanium. When a intrinsic semiconductor?is?doped?with Trivalent impurity it becomes a P-Type?semiconductor.
Answer is:
the actual motion of bound electrons
Explanation:
Motion of hole is a convenient way of describing the actual motion of bound electrons
Answer is:
electron current only
Explanation:
This?current?is called the diffusion?current. The drift?current?and the diffusion current?make up the?total current?in the conductor. The change in the concentration of the carrier particles develops a gradient. Due to this gradient, an electric field is produced in the?semiconductor.
Answer is:
needs low energy to be set free
Explanation:
Impurity atoms with 5?valence electrons?produce n-type semiconductors by contributing extra electrons.