Question

Is the ratio of number of holes and the numbers of conduction electrons in an n-type extrinsic semiconductor more than less than or equal to one?

Answer 1

An extrinsic semiconductor is one that has been doped; during manufacture of the semiconductor crystal a trace element or chemical called a doping agent has been incorporated chemically into the crystal, for the purpose of giving it different electrical properties than the pure semiconductor crystal, which is called an intrinsic 

Answer 2

Answer:

The correct answer is less than one.

Explanation:

• An n-type semiconductor is one that has a pentavalent impurity and is treated with an intrinsic or pure semiconductor (such as silicon or germanium).
• Donor impurities, such as phosphorus, arsenic, antimony, etc., are referred to as pentavalent impurities. Take into account that silicon has been introduced with a pentavalent phosphorus impurity, as illustrated in the picture below.
• Silicon has 4 valence electrons, while atomic phosphorus has 5 valence electrons. Over silicone, the phosphorus atom has an extra valence electron. The four valence electrons of each phosphorus atom combine with the four nearby silicon atoms to form four covalent connections.

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