Suppose a pure \(\mathrm{Si}\) crystal has \(5\times10^{28}~\text{atoms m}^{-3}.\) It is doped by a \(1~\text{ppm}\) concentration of pentavalent \(\mathrm{As}.\) The number of electrons and holes are, respectively:
(given: \(n_i=1.5\times10^{16}~\text{m}^{-3}\))
1. \(5\times10^{22}~\text{m}^{-3}, 4.5\times10^{9}~\text{m}^{-3}\)
2. \(4.5\times10^{9}~\text{m}^{-3}, 5\times 10^{22}~\text{m}^{-3}\)
3. \(5\times10^{22}~\text{m}^{-3}, 5\times10^{22}~\text{m}^{-3}\)
4. \(4.5\times10^{9}~\text{m}^{-3}, 4.5\times 10^{9}~\text{m}^{-3}\)
Subtopic:  Types of Semiconductors |
 61%
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