The Voc and Vbi should have the same behaviour but in my case Voc increases and Vbi decreases, is there any specific reason?
Around room temperature Voc should decrease with temperature bot in organic and in inorganic solar cells.
You can check in this refererences:
"Temperature dependence of open-circuit voltage and recombination
processes in polymer–fullerene based solar cells" A. Thakur et al, Solar Energy Materials and Solar Cells, 2011
"Temperature dependence of open-circuit voltage in organic solar cells from
generation–recombination kinetic balance", G. Belmonte, Solar Energy Materials and Solar Cells,2010
Dear Burak
The increase in temperature results in small reduction in Vb and, consequently, in the device Voc. You may find useful explanation in the manuscript by Kumar et al, APPLIED PHYSICS LETTERS 94, 183505 2009.
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