OK thanks for the replies; this confirms some of my suspicions. I'm trying to examine the I-V curves for both a solar cell and a conventional battery and see how they differ. I have attached a picture of the solar cell I-V curve.
It has a y-intercept at the short-circuit current value...
I'm having trouble understanding how Ohm's Law applies to a battery that is being short-circuited. If the terminals are both connected by a low-resistance wire, then they should be at the same potential, since there's no resistor to cause a drop in potential. But the terminals of the battery...