Error in CHARGE while replicating planar-silicon-solar-cell example

- June 3, 2024 at 5:23 pm
  
  Minhaz Mahmood
  Subscriber
  
  I get this error while I tried to replicate the planar-silicon-solar-cell example from Planar silicon solar cell – Ansys Optics.
  
  Error:.../solar_cell_electrical_results.lsf line 38: in expression A(i,...) the index was out of range
  I was simulating a 5 layer perovskite so I'm not sure what the issue is.
  The problem is with the following line:
  J = I/Lx/Ly*1000; # mA/cm^2
  
  ?kern = find(J<0);
  
  ?kern = length(kern);
  
  ?slope = (J(kern+1) - J(kern))/(V(kern+1)-V(kern));
  
  None of my J values are less than zero, so ?kern = length(kern)=0
  and ?kern = length(kern)=1
  
  Please help.
- June 3, 2024 at 9:38 pm
  
  Amrita Pati
  Ansys Employee
  
  Hi Minhaz,
  Are you applying a voltage sweep to the base? The initial simulation is for a single voltage value. You would have to apply a sweep voltage to the base to plot the current-voltage characteristics:
  If you are running the code with a single voltage applied to the base then it will throw this out of index error. Let me know if you are already using a voltage sweep for the base.
  Regards,
  Amrita
  - June 4, 2024 at 5:42 am
    
    Minhaz Mahmood
    Subscriber
    
    Thank you Ms. Amrita, that solved the issue. You are correct that my base did not have a sweep range but had a single value.
    
    Now I am running into another issue.
    From Lumerical CHARGE simulation I got this J-V and power curve.
    The following results are also simulated:
    Voc = 0.971231 V
    Jsc = -1.77873 mA/cm^2
    Pmax = 0 mW/cm^2
    FF = 0
    eta = 0%
    Why is the shape of my J-V curve and power curve like this? Why is my FF and eta 0?