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Semiconductor Materials – 65

65. Donor type impurities.
i : Have five valence electrons.
ii : Create excess free electrons.
iii : Are used to make n-type semiconductors.
iv : Have three valence electrons.
Of these statements

(a) i and iv are correct
(b) i, ii and iii are correct
(c) ii, iii and iv are correct
(d) iii and iv are correct

Answer : (b)

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