A germanium crystal is doped with arsenic atoms and indium atoms simultaneously. Number of arsenic atoms used = 5 × 1 0 22 per m 3 and number of indium atoms used = 5 × 1 0 20 per m 3 , then resulting

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A germanium crystal is doped with arsenic atoms and indium atoms simultaneously. Number of arsenic atoms used = 5 × 1 0 22 per m 3 and number of indium atoms used = 5 × 1 0 20 per m 3 , then resulting crystal is a/an

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Arsenic is pentavalent while indium is trivalent. Also, n (As) > n ( ln ) , so resulting crystal is n -type. For a p − n junction, we have to dope different regions of crystal.

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