Quantum dot solar power research. Researcher handling perovskite quantum dot solutions. Such solutions show intense photoluminescence when illuminated with ultraviolet (UV) light. This work is being carried out in the Process Development and Integration Laboratory (PDIL) at the National Renewable Energy Laboratory (NREL), Golden, Colorado, USA. The researchers here have set efficiency records for a quantum dot solar cell. Quantum dots are tiny nanoparticles that can be used to harness solar energy to produce electricity. Photographed in June 2017.