Q. 765.0( 2 Votes )

How does the doping increase the conductivity of semiconductors?

Answer :

The conductivity of semiconductors like silicon or germanium can be increased by adding certain amount of impurity or foreign particles in it, this is called doping. The doping can be done either by adding electron rich compound (Example phosphorus) or electron deficit compound (example boron etc). The doped semiconductors are called extrinsic semiconductors and has conductivity greater than pure semiconductor called intrinsic semiconductors. This impurities causes electronic effect in them. When doped with electron rich compound, an unpaired electron becomes delocalized. These delocalized electrons increases the conductivity of doped silicon due to negatively charged electrons when placed in electric field. Silicon doped with electron rich impurity is called n type semiconductor. Similarly when silicon is doped with electron deficit impurity, a delocalized hole is generated with acts as positive charge ion as increases conductivity of silicon when placed in electric field. Silicon doped with electron deficit impurity is called p type semiconductor.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Defects in solid | Solid StateDefects in solid | Solid StateDefects in solid | Solid State61 mins
Defects in solid | Solid State | Quiz TimeDefects in solid | Solid State | Quiz TimeDefects in solid | Solid State | Quiz Time49 mins
Electrical & Magnetic PropertiesElectrical & Magnetic PropertiesElectrical & Magnetic Properties47 mins
Packing efficiency and density | Interactive QuizPacking efficiency and density | Interactive QuizPacking efficiency and density | Interactive Quiz45 mins
Packing efficiency and densityPacking efficiency and densityPacking efficiency and density52 mins
Interactive Quiz on close packing in solidsInteractive Quiz on close packing in solidsInteractive Quiz on close packing in solids45 mins
Classification of solidsClassification of solidsClassification of solids65 mins
Close packing in solidsClose packing in solidsClose packing in solids46 mins
Quiz on Calculation of coordination number in solidsQuiz on Calculation of coordination number in solidsQuiz on Calculation of coordination number in solids38 mins
Interactive Quiz on classification of solids & packingInteractive Quiz on classification of solids & packingInteractive Quiz on classification of solids & packing53 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses