Basic Electronics (EC1101) Classification of Semiconductors By: 1107_003 This document is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. You are free to use, distribute and modify it, including for commercial purposes, provided you acknowledge the source and share-alike. To view a copy of this license, visit https://creativecommons.org/licenses/

TOPICS TO BE COVERED Classification of Semiconductors Elemental semiconductors Compound semiconductors Intrinsic semiconductor Doping Extrinsic semiconductor

LEARNING OBJECTIVE Students should be able to: Classify semiconductor material into different types Explain doping Differentiate between doping and dopants

CLASSIFICATION OF SEMICONDUCTORS On the bases of composition: i) Elemental semiconductors: Si and Ge ii) Compound semiconductors: Inorganic: GaAs, CdS, GaAsP, etc. Organic: anthracene, doped pthalocyanines, etc. Organic polymers: polypyrrole, polyaniline, polythiophene, etc.

CLASSIFICATION OF SEMICONDUCTORS On the bases of the presence of added impurities: i) Intrinsic semiconductors - Ge, Si ii) Extrinsic semiconductors: N-type: Pentavalent dopants - Sb, As & P P-type: Trivalent dopants - B, Ga, and In

Classification of Semiconductors

REFERENCES Electronic Devices & Circuit Theory (11e) by R. L. Boylestad & L. Nashelsky of Pearson Education Electronic Devices and Circuits (2e) by B. P. Singh & R. Singh