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A small impurity is added to germanium to get a p-type semiconductor. Identify the impurity?(a) Bivalent substance(b) Trivalent substance(c) Pentavalent substance(d) Monovalent substanceThis question was addressed to me in a national level competition.I would like to ask this question from Extrinsic Semiconductor topic in section Semiconductor Electronics : Materials, Devices and Simple Circuits of Physics – Class 12

Answer» CORRECT ANSWER is (b) Trivalent substance

The best explanation: A trivalent impurity added to GERMANIUM produces a p-type semiconductor. Trivalent impurities such as boron, INDIUM, and GALLIUM are called acceptor impurity. These can be added to germanium in order to obtain a p-type semiconductor.


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