39016455
| Question | Answer |
| Q .1 State and explain LAW OF MASS ACTION ? | ANS: The product of equilibrium concentration of electrons and holes is equal to intrinsic carrier cocentration no . po = ni^2 |
| Q .2 State and explain SEMICONDUCTOR MATERIALS ? | ANS : > having electrical conductivity btwn that of conductors and insuators > conductivity range - 10^-8 ohm^-1cm^-1 to 10^-3 ohm^-1 cm^-1 > conductivity can be varied by doping > conductivity of doped sc remains constant over a wide range of temperature |
| Q .3 CLASSIFICATION OF SEMICONDUCTORS ? | ANS : > elemental and compound > intrinsic and extrinsic sc > direct and indirect bandgap |
| Q .4 DEFINE ELEMENTAL SEMICONDUCTOR WITH SUITABLE EXAMPLES | ANS : SC CONSIST OF SINGLE SPECIES OF ATOM ARE CALLED ELEMENTAL SC Eg : Si , Ge |
| Q .5 ADVANTAGES OF Si OVER Ge ? | > abudant in nature > easy process of purification > can be operated at high temperature > fabrication is simple |
| Q . 6 DEFINE COMPOUND SEMICONDUCTOR WITH SUITABLE EXAMPLES | ANS : SC Constituted by two or more elements are called compound 3 & 5 compounds : consist of elements from group 3 and 5 Eg : ALP , GaAs , GaP USES : LED's 2 & 4 compounds : consist of elements from group 2 and 4 Eg : ZnS, InSb, CdSe USES: Zns >fluroscent materals in TV InSb, CdSe > light detectors can be made |
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