Question

In this type of semiconductor the recombination of electron hole pair takes place through trap

Direct band gap semiconductor

Indirect band gap semiconductor

conductor

insulator

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Answer 1

Answer:

insaultor

Explanation:

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Answer 2

Answer:

Semiconductors are characterized by two types of mobile carriers, electrons in the conduction band and holes in the valence band. Both bands are separated by the energy gap. This energy gap is about 1.1 eV in silicon. There is a continuous transition of electrons between the two bands. When an electron falls from the conduction band into the valence band, into a hole, a recombination process occurs and an electron hole pair disappears. The energy of recombination will be emerged as a photon of light. Inversely, when a valence electron is given an energy equal or greater than the energy gap it will be transferred to the conduction band and an electron hole pair will be generated.