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In this Physics (Digital Electronics) video lecture in Hindi for class 12 we described different type of semiconductor- intrinsic and extrinsic. Extrinsic semiconductor is of two types p-type and n-type semiconductor. Pure tetravalent substance is known as intrinsic semiconductoe and some impurity is mixed with that pure substance, it becomes extrinsic semiconductor. According to the nature of the impurity, extrinsic semiconductor is subdivided as p type and n type semiconductor. When the impurity is trivalent substance, that becomes p type and when the impurity is pentavalent substance, that becomes n type.
The process of mixing impurity is known as doping.
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