Researchers from University of Exeter have developed a new flexible, transparent and ultra-lightweight photodetector device made from graphene and graphExeter (a room-temperature transparent conductor discovered at the University of Exeter in 2012). The new device can also be used to generate electricity. It's only a few atoms thick and can be woven into textiles to create photovoltaic fabrics.
The researchers say that the efficiency of the new device is similar to opaque devices based on graphene and metals (Nokia, for example, is working on graphene-based photo detectors). The new device does not contain any metals. It can detect light across the entire visible light spectrum.