- #1
jono90one
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Homework Statement
I have been doing an experiment, and I needed to calculate the value of η for a diode.
The value should be between 0.5 and 1.0...
The value for alpha obtained is 20.
Homework Equations
αV=ηeV/kT
Where k is Boltzmann’s constant, eV is the electron volt, T is temperature.
I=I(0)(e^αV) (neglecting the minus 1)
The Attempt at a Solution
I don't really understand how η can be a constant seeming V is a variable. The values of the temperature where never recorded (never asked for in the experiment), so do i assume T = 298K? What voltage do i choose to associate that with? the average?
As by doing that i get 0.33 for η, outside the acceptable range where the range of voltages taken where between 0.8 and 0.5 (so i let v=0.65).
Even if i choose v=0.8, it's still less than 0.5 because v would have to be greater than 1.
The values we were asked to gather were between 0.5 and 0.8 v anyway, so that cannot be wrong. Alpha is defiantly correct as i drew it by hand and plotted it on origin. So currently either 0.33 is correct despite not being in the range, or I’m using the wrong values of V in my calculation (or T).
Hope you can advice me :)