Unformatted text preview: ady states.
Electrons and holes drift in opposite directions because they have
opposite charges.
The two electrical currents formed by (i) electrons flowing in one
direction and (ii) holes flowing in the opposite direction, are
directed in the same direction.
In an intrinsic semiconductor, it is n0 = p0. Under illumination, it is
n = p. Thus n = n0 + n = p = p0 + p. (b) Incorrect. (c) Incorrect.
(d) Correct.
(e) Incorrect.
(f) Correct. (g) Correct. 3. (a) The sample is ptype, because the distance in energy between the hole quasiFermi level
and the valence band is smaller than the distance in energy between the electron quasi160 meV
Fermi level and the conduction band, F
V
C
F (where F
V
and C
360 meV).
F
(b) From derivations in parts (d) and (g) we can calculate the change in elec...
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 Spring '13
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 Volt, 6 cm, 4 cm, 100 cm, 104 cm, 2 450 cm

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