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If what of the following is doped into a semiconductor say germanium a P-N junction is formed.

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If what of the following is doped into a semiconductor say germanium a P-N junction is formed.

(a) Electrons and Protons

(b) Protons and Neutrons

(c) Neutrons and Electrons

(d) Gallium and Phosphorus

I have been asked this question by my college director while I was bunking the class.

My query is from Quantitative Theory of the P-N Diode Currents topic in division Semiconductor-Diode Characteristics of Electronic Devices & Circuits

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Correct choice is (d) Gallium and Phosphorus

The best explanation: A P-N junction is formed only when a donor impurities and acceptor impurities are added to either side of a semiconductor like silicon and germanium.

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