Unformatted text preview: reshold voltage,
/ . In Si, it is
1.12 eV, and in GaAs, the
Therefore, Si diode turns on at a lower forward voltage than the GaAs diode. (c) Since ,
, the forward voltage of the Ge diode must be smaller than
both forward voltages of Si and GaAs diodes. 2. (a) Correct. Under equilibrium, all processes are balanced by the opposite
process. The semiconductor of an LED, under steady-state current injection,
has much more recombination than generation. The semiconductor
of a photodetector, operated under steady-state conditions, has a
much larger photo-generation rate than recombination rate. In a pn-junction diode operated under forward bias, the diffusion
current is much larger than the drift current.
A transient state always occurs between two ste...
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- Spring '13
- Volt, 6 cm, 4 cm, 100 cm, 104 cm, 2 450 cm