Researchers from Soochow University in China have demonstrated that a solar cell can generate electricity from rain drops.
By using a form of electricity generator called a triboelectric nanogenerator (TENG), researchers have shown they can convert mechanical energy, effectively motion, into electricity. In this case, solar cells harvest power from the movement of raindrops falling upon them. It is hoped the same premise could be applied to harness other forms of mechanical energy from the living environment, such as walking, typing or moving vehicles.