Radiative cooling is a natural process where heat from the Earth's surface escapes into space, especially on clear nights. The researchers at Stanford University have harnessed this phenomenon by attaching special thermoelectric generators to standard solar panels.
At night, solar panels do not generate electricity because there is no sunlight. While moonlight and artificial lights exist, they are not strong enough to produce usable energy.
No — standard photovoltaic (PV) solar panels do not generate useful electricity at night because they require photons from sunlight (solar irradiance) to free electrons and create current.