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꧁≪Mämƭå ℭℏᑌĎℎàℜÿ? 6 years, 3 months ago
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Yogita Ingle 6 years, 3 months ago
Electric charge is a physical property of matter that causes it to experience a force when kept in an electromagnetic field. Positive and negative are the two types of electric charges, commonly carried by charge carriers protons and electrons. When the net charge of an object equals to zero, the object is said to be neutral.
Posted by Surya Pratap Singh 6 years, 3 months ago
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Yogita Ingle 6 years, 3 months ago
n-type semiconductor
- When pure Si or Ge which has four valency electrons is doped with controlled amount of pentavalent atoms, like Arsenic, Phosphorus, Antimony or Bismuth, we get a n-type semiconductor
- The four valence electron from the impure atom will combine with four electrons of the Si or Ge atom to form 4 covalent bonds
- The fifth electron of the impure atom is free to move. Thus, each atom of the impure substance, donates a free electron for conduction. Hence, it is called as donor atom
- Giving the free electron for conduction, the impure atom becomes positively charged, giving rise to a hole
- Thus in n-type semiconductors, electrons are the majority carriers and holes are minority carriers
Posted by Surya Pratap Singh 6 years, 3 months ago
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Yogita Ingle 6 years, 3 months ago
A p-n junction is the basic building block of many semiconductor devices like diodes, transistor etc.
- Consider a thin p-type silicon semiconductor wafer. Convert a part of the p-type semiconductor into n-type silicon semiconductor by adding a small quantity of pentavalent impurity
- The holes are the majority carriers in the p-type semiconductor and electrons are the majority carriers in the n-type semiconductor
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∂Αяѕнαиαα ყα∂Αѵ ??? 6 years, 3 months ago
6Thank You