Question

how does the doping increases the conductivity of semiconductor ??​

Answer 1

Answer:

In order for a substance to conduct electricity, its valence electrons must cross the band gap, which is the energy gap between the valence band and conduction band. ... Because the band gap is so small for semiconductors,doping with small amounts of impurities can dramaticallyincrease the conductivity of the material.

Answer 2

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✯ SEMICONDUCTOR :-

• A material which have tendency to conduct electricity but the range of conductivity lies between conductor and non-conductor known as semiconductor.

• semiconductor can be pure element like as silicon or germanium. (intrinsic semiconductor)

• semiconductor can be compound like as galium arsenide.(Extrinsic semiconductor)

☆ WHAT IS DOPING ?

• Doping is basically introduction of impurities into an intrinsic semiconductor for the perpouse of enhance (modulating) it's structural , optical and electrical property.

✧ How doping Increases conductivity :-

• conductivity of semiconductor increases after suitable doping in intrinsic semiconductor.

• After introducing impurities which is electron deficient or electron rich as compared to pure (intrinsic semiconductor), such impurities introduce electronic defects in it.

✷ There are two types of doping

• Electron rich doping (N-type semiconductor)

• Electron deficient doping (P-type semiconductor)

✿ Let's take an example of Sillicon to understand the increasing conductivity of semiconductor when we doing electron rich doping :-

• When silicon is doped with electron rich impurities the extra electron becomes delocalized

• These delocalized electrons increase the conductivity of doped silicon due to the negatively charged electron

• hence silicon doped with electron-rich impurity is called n-type semiconductor

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