Transient and Flexible Photodetectors

With rapid development of technology, electronic devices have omnipresent in our daily life as they have brought much convenience every aspect of human activity. Side-by-side, electronic waste(e-waste) has become a global environmental burden creating an ever-growing problem. The transient device technology in which the devices physically disappear completely in different environmental conditions attracted widespread attention in recent years owing to its emerging potential spanning from biomedical to military use. In work, we demonstrated the first attempt for a dissolvable ecofriendly photodetector using a hybrid of graphene and chlorophyll a poly­(vinyl alcohol) substrate. The whole device can physically in aqueous solutions in a time span of ∼30 min, while shows a photoresponsivity of ∼200 A W–¹ under ambient conditions. The high carrier mobility of graphene strong absorption strength of a green photon harvesting layer,, result in the photocurrent gain of the device as high 10³ with subsecond response time under the illumination red light. The newly designed photodetector shown here yields zero with a minimum impact on the environment, which is very useful the development of the sustainability of our planet.