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Homework Help: Semiconductor diode (graph quesiton)

  1. Mar 31, 2014 #1
    1. The problem statement, all variables and given/known data

    The current-voltage characteristic curve of a semiconductor diode as a function of temperature T is given by the equation: ##I = I_0(e^{|e|\Delta V / k_BT}-1)##
    where e is the base of the natural logarithm.
    |e| is the charge of an electron
    k_B is the boltzmann's constant
    and T is the absolute temperature.

    Set up a spreadsheet to calculate I and R = ΔV/I for V = 0.400V to 0.600V at 0.005 V increments. Assume I_0 = 1.00nA. Scatterplot R versus ΔV for T = 280K, 300K, 320 K. Plot the temperatures.

    2. Relevant equations

    see above
    3. The attempt at a solution

    I don't get how you can set up a spreadsheet to calculate I….aren't we missing the value of T?
    And if "T" is suppose to be the absolute temperature, wouldn't it be 0 K making the fraction undefined?
  2. jcsd
  3. Mar 31, 2014 #2


    User Avatar

    Staff: Mentor

    It looks like they want results for the 3 temperatures given. Maybe make the first column the voltage, then calculate I in 3 more columns, one for each temperature.

    I don't get the bolded part of the question, though. Is that copied exactly from your assignment?
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