Forget photovoltaic. Go for solar towers or the ones that use heliostats to heat salt or sulfur for 24 hour power.
Exactly, focused solar energy, either as parabolic trough, or heliostat tower, is better for actually being able to store back-up power. Using focused solar energy is also practical for waste incineration.
Even more advanced, though not yet practical is space-based solar power, emitted by microwave. The geosynchronous position of the solar satellites ensure that they are in the Sun 24/7. The focusing of energy at the receiver ensures that the radiation emitted by the satellites is dispersed and harmless unless focused intensely by the receiver.