Physics of class-12 The following topics are Covered in this video Electronics " Semiconductors 1-Introduction of electronic & electronic devices the basis of their electrical Properties semiconductors 2-classification of solids on Unacademy 3-classification of Board & Competition
ELECTRONIC DEVICES Solid-state electronic devices Semiconductors
Electronics Here the electric current will go In Conductor, Semiconductor Insulator Here the e.current will Here the e.current either Here the e.current will Come out or not Come out not come out
Conductivity Semiconduct. 10 s -g Resistivi
Classification of semiconductors on the basis of their chemical composition 1- Elemental semiconductors:- 2- Compound semiconductors Si and Ge (i)-Inorganic:- CdS, GaAs, CdSe, InP etc. (ii)- Organic polymers Polypyrrole, polyaniline Polythiophene, etc. Classification of semiconductors on the basis of the source and the nature Of the charge carriers. Intrinsic semiconductors (Pure) Extrinsic semiconductors (Impure)
Intrinsic semiconductors The pure semiconductors are called intrinsic semiconductors. Their conductivity is due to their own charge carriers. The well known semiconductors are germanium and silicon. They are tetravalent hole (+ve) @ si Si Si Si After heating some covalent bonds break due to thermal agitation and thus some e's get free for conduction At NTP there is no free charge carrier for conduction
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