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To obtains p-type germanium semiconductor it must be doped with

$(a)\;Arsenic \\ (b)\;Antimony \\ (c)\;Indium \\ (d)\;phosphorous $
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The doping impurity is Indium.
To obtain a p-type semiconductor the impurity must be trivalent.
Hence c is the correct answer.
answered Jan 31, 2014 by meena.p

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