Effect of temperature on voltage

AI Thread Summary
Voltage decreases with temperature due to increased kinetic energy of electrons, which leads to more frequent scattering events between electrons and the lattice. This scattering reduces current flow, subsequently lowering the open circuit voltage in silicon solar cells. Additionally, the knee voltage of diodes also decreases with rising temperatures. Understanding these effects is crucial for optimizing solar cell performance. The relationship between temperature and voltage is a key factor in the efficiency of photovoltaic systems.
vw_g60t
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Hi,

I know that voltage decreases with temperature but why?

I am looking into silicon solar cells but cannot find any sources which explain why open circuit voltage decreases with rise in temperature.

can some explain please!

thanks
 
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vw_g60t said:
Hi,

I know that voltage decreases with temperature but why?

I am looking into silicon solar cells but cannot find any sources which explain why open circuit voltage decreases with rise in temperature.

can some explain please!

thanks

I cannot give you a rigorous explanation, but I think (but I'm not totally sure) that the increase of temperature causes the increase of the electrons' kinetic energy. That's why the scattering events between electrons and the lattice occur more frequently: this fact decrease the current, and so the voltage.
 
For a short discussion you can refer to Electrical Riddle No.26 from http://electrical-riddles.com :smile:
 
Please refer to my contribution in another discussion. The knee voltage of the diode decreases with temperature.
 

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