Relative values of the resistivity
are not the only criteria for distinguishing metals, insulators and
semiconductors from each other There are some other differences, which
will become clear as we go along in this chapter Our interest in this chapter is in the study of semiconductors which
could be:
(i)
Elemental semiconductors: Si and Ge
(ii) Compound semiconductors: Examples are:
· Inorganic: CdS, GaAs, CdSe, InP, etc · Organic: anthracene, doped pthalocyanines, etc