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As the name refers, p-type semiconductors are positively charged and n type semiconductor are negatively charged. p-type semiconductor is created when any trivalent impurity is added to  pure semiconductor such as silicon or germanium and n type semiconductor is formed when any pantavalent impurity is added to an intrinsic or pure semiconductor such as phosphorus or arsenic.

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https://learn.careers360.com/ncert/question-what-is-a-semiconductor-describe-the-two-main-types-of-semiconductors-and-contrast-their-conduction-mechanism/

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