Give a classification of semiconductors and write examples of each.

Explanation

Semiconductors are in the original element and compound.
(i) Elemental semiconductors : Si and Ge
(ii) Compound semiconductors : Examples are,
(A) Inorganic : CdS, GaAs, CdSe, InP etc.
(B) Organic : anthracene, doped pthalocyanines etc.
(C ) Organic polymers : polypyrrole, polyaniline, polythiophene, etc.
Most of the currently available semiconductor devices are based on elemental semiconductors Si or Ge and compound inorganic semiconductors.
After 1990, a few semiconductor devices using organic semiconductors and semiconducting polymers have been developed signalling the birth of a futuristic technology of polymer electronics and molecular - electronics.