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Which of the following is known as indirect band gap semiconductors?

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Which of the following is known as indirect band gap semiconductors?

(a) Germanium

(b) Nickel

(c) Platinum

(d) Carbon

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This interesting question is from Properties of Semiconductors in portion Semiconductors of Engineering Physics II

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The correct answer is (a) Germanium

The best I can explain: The elemental semiconductor is made up of a single element from the fourth column elements such as Germanium. Here recombination takes place takes place via traps. It is called indirect band gap semiconductors.

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