Topics 10 - Doping, donors and acceptors

Question 1

Explain the concept of donors and acceptors in semiconductors.

Answer 1

Donors are atoms with an extra electron in the outer shell that can occupy states in a conduction band.

Acceptors are atoms with an empty hole that can provide a hole in a conduction band.

Question 2

Give two

examples of donor elements for silicon and germanium.

Answer 2

Atoms of group V(Phosphorous or Arsenic) will be donors for Silicon and Germanium

Question 3

Provide an explanation of why these

elements act as donors.

Answer 3

By replacing an electron in a sample through covalent bonding

Question 4

Give two

examples of acceptor elements for silicon and germanium.

Answer 4

Atoms of group III will be acceptors for Silicon and Germanium

Question 5

Provide an explanation of why these

elements act as acceptors

Answer 5

Electrons can be filled by an electron from a samples valance band