IIRC all the efficient solar cells we currently have contains some rare materials. Once a particular solar technology reaches grid parity, the demand for the relevant rare material will increase, placing a floor under the price of that solar cell.
In the case of Moore's Law, a transistor can be any size. By contrast, solar cells absorbs too little energy if they are too thin.
TL;DR: There are real physical limitations to solar cells.
In the case of Moore's Law, a transistor can be any size. By contrast, solar cells absorbs too little energy if they are too thin.
TL;DR: There are real physical limitations to solar cells.