midterm-EE339-08 - Find the separation of the quasi-Fermi...

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Find the separation of the quasi-Fermi levels and the change of conductivity when shining light. The light induced electron-hole pair concentration is determined by: 33 3 3 3 3 19 5 14 11 op cm s cm 16 1 o cm 16 14 16 1 o cm cm cm 14 2 1 2 14 cm i 1 o 16 cm 1 o cm - δ n = δ p = g τ = 10 10 s = 10 δ n < dopant concentration of n = 10 so low level n = n + δ n = 10 + 10 10 (10 ) n p = p + δ p = + δ p = + 10 n1 0 ⋅⋅ 3 3 3 3 14 1 cm 16 1 cm ni 14 1 i cm 14 1 cm ip 14 1 i cm np 10 450K kT for 450K = 0.0259eV = 0.039eV 300K 10 n F - E = kT ln = 0.039eV ln = 0.18eV 0 10 p E - F = kT ln = 0.039eV ln = 0eV
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This note was uploaded on 01/28/2009 for the course EE 339 taught by Professor Banjeree during the Spring '08 term at University of Texas at Austin.

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midterm-EE339-08 - Find the separation of the quasi-Fermi...

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