Stable, self-powered sensor

A new self-powered photodetector based on a gadolinium niobate and niobium-doped strontium titanate heterojunction device has been developed by researchers in China and Singapore. The device might find use in a wide range of applications from chemical analysis to communications to astronomical investigations. The inherent electric field of the interface between the materials in this device is the driving force for efficient separation of photo-generated carriers, which eliminates the need for an external power supply.