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in Electronic Devices by (430 points)
Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms \( m ^{-3} \). It is doped by a 1 ppm concentration of pentavalent As. The number of electrons and holes are, respectively: (Given that \( n _{ i }=1.5 \times 10^{16} m ^{-3} \) ) 1. \( 5 \times 10^{22} / m ^{3}, 4.5 \times 10^{9} / m ^{3} \) 2. \( 4.5 \times 10^{9} / m ^{3}, 5 \times 10^{22} / m ^{3} \) 3. \( 5 \times 10^{22} / m ^{3}, 5 \times 10^{22} / m ^{3} \) 4. \( 4.5 \times 10^{9} / m ^{3}, 4.5 \times 10^{9} / m ^{3} \)

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