MATLAB: Trying to Plot Temperature with Current Density

plottemperature

Hello,
I am trying to plot temperature with current denstiy. However, I get the "vectors must be the same length" error.
This is the code:
clear all
clc
close all
J0ref=2e-7; % Saturation current density mA/cm2
Rs=0.001;    % Series resistance k ohm cm2
Rp=1000;    % Parallel resistance k ohm cm2
n= 1.5;    % Diode ideality factor
Jsc=30; % Short circuit current density in mA/cm2
k=1.38e-23; % Boltzmann constant
Tref= 300 ;  % Absolute Temperature
q= 1.6e-19; % Electric charge 
Eg=1.12; % Band gap of Silicon
 Vx=linspace(-1,1,200);
  TT=[300 350 400];
  for i=1:length(TT)
        Vt=k*TT(i)/q;   % Thermal voltage
        J0(i)=(J0ref*(TT(i)/Tref)^(3/n))*exp(-q*Eg/(n*k)*(1/TT(i)-1/Tref));
  J=J0(i)*(exp(Vx/(n*Vt))-1)+Vx/Rp-Jsc; 
 V=Vx+J.*Rs;   
before=V(find(J<0)); after= V(find(J>0));
Voc(i)=(before(end)+after(1))/2;
Power=-J.*V;
maxpos=find(Power==max(Power));
Jm=J(maxpos);
Vm=V(maxpos);
DATA=[V' , J' , Power'];
FF(i)=-Jm*Vm/(Jsc*Voc(i));
eta(i)=FF(i)*Jsc*Voc(i)/100;
h1=figure
set(h1,'name','JV Special Topics','numbertitle','on')
set(gcf,'DefaultAxesBox','on'),
set(gcf,'DefaultAxesLineWidth',2) , 
set(0,'DefaultAxesFontSize',14),
plot(TT,J);
  end
What do I do to make them the same length? thank you.

Best Answer

You may use Interpolation to increase the number of elements in the "TT" to match the number of elements in the "J".
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