Some minor confusion about solar cell efficiency calculations

[iamcqlin]

Hi everyone.

Jarvis is a big project and the code in it works very well. I often use the part of the code about calculating the limiting efficiency of the solar spectrum.

https://github.com/usnistgov/jarvis/tree/master/jarvis/analysis/solarefficiency

However, I encountered some situations in my use that I could not understand. I would like to ask for some help from developers or other people.

I wrote a small loop to try to calculate the relationship between the thickness of a material and its efficiency. The efficiency of most materials increases with increasing thickness and converges to a constant value. However, when I calculated the control material, I found that the efficiency started to decrease with increasing thickness.

When I tried to break down the code I found that the short-circuit current still increased as the thickness increased, but the value of the maximum power became smaller. I don't know what the problem is and if this is normal. In theory shouldn't the thickness only be related to the short circuit current; can someone help me.

The image file I have placed below.

I am wondering if you could kindly give me some help to deal with this problem.

Thank you very much for your kind consideration and I am looking forward to your early reply.

vaspxml.zip

Best regards!

Lin
2021/8/8