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How does the doping increase the conduct...

How does the doping increase the conductivity of semiconductors?

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What is the effect of doping on electric conductivity of a semiconductor ?

Statement I: In spite of increasing in doping level the conductivity of the semiconductor does not change. Statement II : By increasing in doping level the conductivity the concentration of one type of charge carriers (electrons or holes ) is increased and at the same time concentration of other charge carrier decreases.

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Assertion(A) : Semiconductors are solids with conductivities in the intermediate range from (10^(-6)-10^(4)ohm^(-1)*m^(-1)) . Reason ( R) : Intermediate conductivity in semiconductor is due to partially filled valence band.