The world’s thinnest photodetector has been developed. This is a device that converts light into an electric current. With a thickness of just 1.3 nanometers – 10 times smaller than the current standard silicon diodes – this device could be used in the Internet of Things, smart devices, wearable electronics and photoelectronics. This 2D technology uses molybdenum disulfide (MoS2) sandwiched in graphene.