In an n-type silicon sample the intrinsic concentration is 1.5 10 16 m -3 and the electron concentration is 5 10 22 m -3 . The hole concentration is:

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In an n-type silicon sample the intrinsic concentration is 1.5 × 1016 m-3 and the electron concentration is 5 × 1022 m-3. The hole concentration is:

Answer: 4.5 10 9 m -3.

A 2.25×109 m-3
B 5×1022 m-3
C 4.5×109 m-3
D 1.5×1016 m-3

Correct answer: C. 4.5×109 m-3

Explanation: By the mass-action law nenh = ni2, so nh = (1.5 × 1016)2/(5 × 1022) = 4.5 × 109 m-3.

Conductors have overlapping bands, semiconductors have a small energy gap that can be bridged by heat or doping, and insulators have a large gap that blocks conduction.

Concept context

Band theory, p-n junction, diodes, transistors, logic gates, and integrated circuits.

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In an n-type silicon sample the intrinsic concentration is 1.5 &times; 10<sup>16</sup> m<sup>-3</sup> and the electron concentration is 5 &times; 10<sup>22</sup> m<sup>-3</sup>. The hole concentration is:

Concept context

More Semiconductor Electronics questions

In an n-type silicon sample the intrinsic concentration is 1.5 × 10<sup>16</sup> m<sup>-3</sup> and the electron concentration is 5 × 10<sup>22</sup> m<sup>-3</sup>. The hole concentration is: