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Posted: Sep 15, 2013
Three studies highlighting the exciting potential of graphene for optoelectronic devices
(Nanowerk News) The fabrication of high-performance light detectors—important for computers and mobile devices—using graphene integrated onto a chip is reported in three independent studies published online this week in Nature Photonics.
Thomas Mueller and co-workers describe in a second paper a graphene light detector with a multigigahertz operation over a wide range (1,310–1,650 nm) that includes all the bands used by optical-fibre communication systems. Its responsivity is approximately eight times higher than that of earlier graphene light detectors ("CMOS-compatible graphene photodetector covering all optical communication bands").
Scanning electron microscope image of a silicon waveguide-integrated graphene photodetector. Light propagates along the waveguide and is converted in a sheet of graphene into an electrical signal. (Image: Thomas Mueller)
The unique optical and electrical properties of graphene and the ability to create these detectors using existing fabrication technology for integrated circuits in digital devices makes it very likely that graphene will soon replace germanium and compound semiconductors in high-performance light detectors. These three studies therefore further highlight the exciting potential of graphene for optoelectronic devices.