Last I checked, Moore's Law simply does not apply to photovoltaics.
The exponential increase in computing comes from being able to make smaller transistors, and the fact that a smaller transistor is able to perform the same computation as a bigger transistor.
A smaller solar cell is not capable of converting the same amount of power as a larger cell, because its power output depends on the area. (Also on the efficiency, but that's a separate issue, and not subject to exponentials).
It was also always something that was driven by demand, as you need ever more expensive fabs to create the smaller feature sizes. It is most definitely not something that happened just due to time passing.
The exponential increase in computing comes from being able to make smaller transistors, and the fact that a smaller transistor is able to perform the same computation as a bigger transistor.
A smaller solar cell is not capable of converting the same amount of power as a larger cell, because its power output depends on the area. (Also on the efficiency, but that's a separate issue, and not subject to exponentials).
It was also always something that was driven by demand, as you need ever more expensive fabs to create the smaller feature sizes. It is most definitely not something that happened just due to time passing.