Since I did this and set up systems for this and other research solar cell characterizations professionally, the first thing I have to ask is what are you after? Research grade cells, modules? Are you just looking for a few points such as Vmp, Imp, Pmax, Isc, Rsc, Rs, Rsh. I did not do high current arrays. Voltage sweep was from about -1 to +1 V max. Isc was never more than about 30 mA. The latest system was based on Keithley's Source meter line with up and down sweeps. Agilent has a source meter line too.
Activation energy measurements are a bit more complicated with currents in the pA range and voltages around +-100 V and an environmental chamber that went from +200 C to -80C. It wasn't ideal because of the fan, but it was OK.
The light source and temperature control will be your biggest headaches.
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