Modelling of solar cell: offset in short-circuit current

Thread Starter

l0st_l0rd

Joined Apr 29, 2013
12
Dear members

I am trying to simulate the IV curve of a solar cell in reverse and forward bias. I have used bishop equation that you can see in the following picture.



The mathermatical model is in good accordance with measurement. However, when I simulate it in SPICE, I have an offset in current which I think is related to the way I have added the leakage part.



Here is my SPICE code. I will be thankful to have help for correction.

.param a=1.987261e-01
.param b=2.741757
.param Vbr=-1.865206e+01

.MODEL diode1 D(is={3.71896e-10}, n=1, xti=3)
.MODEL diode2 D(is={1.178667e-05}, n=2, xti=3)

Iphoto 0 internal 8.05
D1 internal 0 diode1
D2 internal 0 diode2
Rsh internal n1 92.3597
G1 0 n1 value={1+a*pow((1-(V(internal)/ Vbr),-1*b))}
Rs output internal 0.00252

.dc Vbias -18 1 0.01​
 
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