Answer 1:
I don't know the processes in detail, but the general principle is that organic solar cells use organic compounds to capture photons and transfer electrons to a storage medium in a fashion similar to how opsins (the pigments in your eyes that detect light) work.
Inorganic solar cells use metal compounds rather than organic compounds, and are more efficient, but also more toxic, as well as intrinsically more expensive to make (organic compounds are made of common elements, while inorganic solar cells use rare elements). | 
