In my Perovskite Solar cell with architecture ITO/PEDOT:PSS/Perovskite(Ag) Nano particles/PCBM/LIF/Al

Films looks good high Jsc and FF can be obtained but low Voc, i did not find whats the problem

Its not film problem though as FF and Jsc are ok but may be alignment of Band Structure Causes low Voc

In addition to what has been said what is the definition of Voc in Perovskite Solar Cell?

Please help me out

Thanks