The open circuit voltage and Fill factor are parameters in general characterize solar cells regardless or even it was fabricated from organic or inorganic material.
Voc and FF can be (and are) used in ALL solar cells. The interpretation of changes in these values vary from one solar cell to another because the mechanism to describe how the device work is different.
The answers above are okay. There are performance parameters that measure the performance parameter irrespective of their technology. These parameters are the short circuit current, Isc, the open circuit voltage Voc, the fill factor FF. These parameters determines the conversion efficiency of he solar cell that can be expressed as:
The conversion efficacy= Isc Voc FF/ Pi, where Pi is the input solar power.
Isc is the measure of the external quantum efficiency, Voc is the measure of how much energy of the incident photons is converted into electrical energy and the fill factor is the measure of the recombination losses and ohmic losses in the cell.
These parameters depends on the construction and technology of the solar cell.
Yes, they are, and in fact are important in all solar cells (organic, inorganic, thin film or hybrid solar cells) as stated above. What determines each of these parameters and their range(values) in various solar cells may differ though, but since you need them to calculate the efficiency of any solar cell, they are crucial, defining parameters of solar cells