A silicon crystal sample has 50 billion silicon atoms and 5 million free electrons. The silicon crystal is additionally doped with 5 million pentavalent atoms. Assume that the ambient thermal energy is much smaller than the bandgap of silicon. How many free electrons and holes are there inside the silicon crystal?

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Physics · Semiconductors

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Number of electrons is 10 million and number of holes is zero.

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Answer 1

Number of electrons is 30 million and number of holes is zero.

Answer 2

Number of electrons is 10 million and number of holes is zero.

Answer 3

Number of electrons is 10 million and number of holes is 5 million.

Answer 4

Number of electrons is 5 million and number of holes is 5 million.

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