Concept explainers
The following graph shows the relationship between current and voltage in a 1 N4148 small signal diode (a semiconductor device that allows current to flow in one direction but not the other).
Semiconductor diodes can be characterized by the Shockley equation:
Where
lDis the diode current [amperes]
10 is the reverse saturation current, constant for any specific diode
q is the charge on a single electron, 1.602 x 1 o-19 coulombs
VD is the voltage across the diode [volts]
n is the emission coefficient, having a numerical value typically between 1 and 2, and constant for any specific device.
k is Boltzmann's constant, 1.381 x 10-23 joules per kelvin
T is the temperature of the device [kelvin]
- a. What are the units of the 1 following the exponential term? Justify your answer.
- b. If the device temperature is 100 degrees Fahrenheit, what are the units of the emission coefficient, n, and what is its numerical value? (Hint: Electrical power [W] equals a volt times an ampere: P = VI. One ampere equals one coulomb per second.)
- c. What is the numerical value and units of the reverse saturation current, 10? Use an appropriate metric prefix in your final answer.
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