MadSci Network: Physics |
Hello Chas: This is in response to your question re solar cells. As you raise the temperature of your device the voltage output falls because the electrons are being heated and the Fermi energy level is changing. The heated electrons produce more current because being heated more of them can rise above the threshold level and conduct, much in the way that the solar radiation also makes the current rise by giving energy to the electrons. You do not mention the temperature ranges which you have covered and without seeing your graph it is diffucult to understand what you are describing. Light intensity by itself will not change the Fermi energy level but heat will. For a more complete discussion of your question I would have to see your graph, and also I would need more time to research into solar-cell behaviour. Best regards, Richard Bersin....
Try the links in the MadSci Library for more information on Physics.