Diode fitting with 5 parameters

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Rosemarie
Rosemarie 2014-6-20
回答： arushi 2024-8-12
I used fsolve function (advised by Mischa Kim) to solve the diode equation and it worked (with small modification on (q/nkT).
fun = @(I) Il - Io * exp((V + I*R)/(n*kT_q)) - (V + I*R)/S - I;
Now I need to do a fitting using the same equation but this time I need Matlab to iterate the values for:
Il , Io, R, n, S,
in order to solve I which will give me the best fit against the experimental I (Iexp) where V is the independent variable. I guess I will need the least square function for that but first how do I ask Matlab to do the iteration and eventually solve the I?
Thank you very much for your help.
Rosemarie
  1 个评论
Rosemarie
Rosemarie 2014-6-20
Further to my question above, the 5 parameter (Il , Io, R, n, S,) values will be the same for all Icalc.
Cheers.
Rosemarie

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回答（1 个）

arushi
arushi 2024-8-12
Hi Rosemarie,
To perform a fitting using the diode equation and find the parameters (I_l), (I_o), (R), (n), and (S) that best fit your experimental data, you can use the lsqcurvefit function in MATLAB. This function performs non-linear least squares fitting.
Here's a step-by-step guide to achieve this:
  1. Define the diode equation function: Create a function that computes the current (I) given the parameters and the voltage (V).
  2. Define the objective function for lsqcurvefit: The objective function should return the difference between the experimental current (I_{\text{exp}}) and the computed current (I).
  3. Use lsqcurvefit to find the best-fit parameters: Call the lsqcurvefit function with initial guesses for the parameters.
Hope this helps.

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