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What are semi-conductors ? Describe the ...

What are semi-conductors ? Describe the two main types of semi- conductors.

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Semi-conductors are the solids whose conductivity lies in between those of conductors and insulators. It normally ranges between `10^(-6)` to `10^(4)ohm^(-1)cm^(-1)`. Two main types of semi-conductors are : n-type semi-conductors , p-type semi-conductors.
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An n-type semi- conductor is

In a P -type semi-conductor

DINESH PUBLICATION-SOLID STATE-QUESTION FROM BOARD EXAMINATION
  1. Crystalline solids are anisotropc in nature. What does this statement ...

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  2. Distinguish between intrinsic and extrinsic semi-conductors on the bas...

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  3. What are semi-conductors ? Describe the two main types of semi- conduc...

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  4. KF has ccp structure. Calculate the radius of the unit cell if the edg...

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  5. Give reason : (a) Why is Frenkel defect found in AgCl ? (b) What i...

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  6. Classify each of the following as being n-type semi-conductor. Give re...

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  7. How many atoms constitute one unit cell of a face-centred cubic crysta...

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  8. What type of stoichiometric defect is shown by AgCl ?

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  9. What type of substances would make better permanent magnets, ferromagn...

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  10. What type of solids are electrical conductors, malleable or ductile?

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  11. Why is glass considered a supercooled liquid?

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  12. Why does the conductivity of silicon increase upon doping with phospho...

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  13. What change occurs when AgCl is doped with CdCl(2) ?

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  14. What type of semi-conductor is produced when silicon is doped with bor...

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  15. Define radius ratio. What is the value of radius ratio for octahedral ...

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  16. For a value of radius ratio between 0.732-1.0, what is the co-ordinati...

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  17. What type of stoichiometric defect is shown by KCl and why ?

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  18. Express the relation between atomic radius (r) and edge length (a) in ...

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  19. Ionic solids conduct electrical insulator in solid as well as in molte...

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  20. What type of substances would make better permanent magnets, ferromagn...

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