Kai Wang
The reason has been explained here.
http://www.pveducation.org/pvcdrom/solar-cell-operation/iv-curve
Click to view the animation.
The IV curve of a solar cell is the superposition of the IV curve of the solar cell diode in the dark with the light-generated current. The light has the effect of shifting the IV curve down into the fourth quadrant where power can be extracted from the diode. Since the cell is generating power, the convention is to invert the current axis.
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