Fill factor is ratio of the max. power from the solar cell to the product of Open ckt voltage (Voc) and Short ckt current (Isc). Efficency directly preposnal to FF
But sir as i got FF 0.26, Isc= 20 micro A and Voc=0.74 so efficiency comes out to be around 3% is it possible? as i have FF very low ? Please give your valuable suggestions. I am waiting ..
The FF is evaluated as the point with Best Power Convertion, so the ideal point to run a device. Good cells are above 70% FF., but that is not directly related to overall efficiency, i.e. FF is thebest efficiency for your cell, but you can not compare it with different types of cell.