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Differentiate between extrinsic and intrinsic semiconductor. Obtain an expression for the carrier concentration for an intrinsic semi-conductor. Also demonstrate that Fermi level in an intrinsic semiconductor lies approximately half way between the top of valence band and the bottom of conduction band.
In intrinsic semiconductors, conduction is because of intrinsic processes characteristics of crystal, without influence of impurities. A pure crystal of silicon or germanium is an intrinsic semiconductor. Electrons which are excited from the top of the valence band to the bottom of the conduction band by thermal energy are responsible for conduction. Number of electrons excited across the gap can be calculated from the Fermi-Dirac probability distribution. In extrinsic semiconductors, conduction is because of the presence of extraneous impurities. Process of deliberate addition of controlled quantities of impurities to a pure semiconductor is known as doping. Addition of impurities markedly increases the conductivity of a semiconductor. Conductivity of an intrinsic semiconductor depends on concentration of charge carriers, ne and nh. Mobility of conduction electrons and holes µe and µh can be defined as drift velocity acquired by them under unit field gradient. The conductivity σ of a semiconductor can be written
Consider the diols (containing 2 alcohol functional groups) of molecular formula C 5 H 12 O 2 (a) Illustrate all the possible structural isomers. (b) Label the stereogenic
The radius of the nucleus is related to the mass number A by : (1 )R= R 0 A 1/2 (2) R= R 0 A (3) R= R 0 A 2
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how to find out the basic radicals
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which kind Acid &Basic radical present in this?
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