Physics – Condensed Matter – Materials Science
Scientific paper
2009-12-24
Nature Nanotech., 4 (12): 839-43 (2009)
Physics
Condensed Matter
Materials Science
25 pages, 3 figures
Scientific paper
10.1038/nnano.2009.292
The electronic properties of graphene are unique and are attracting increased attention to this novel 2-dimensional system. Its photonic properties are not less impressive. For example, this single atomic layer absorbs through direct interband transitions a considerable fraction of the light (~2.3%) over a very a broad wavelength range. However, while applications in electronics are vigorously being pursued, photonic applications have not attracted as much attention. Here, we report on ultrafast photocurrent response measurements in graphene (single and few-layers) field-effect-transistors (FETs) up to 40 GHz light intensity modulation frequencies, using a 1.55 micron excitation laser. No photoresponse degradation is observable up to the highest measured frequency, demonstrating the feasibility and unique benefits of using graphene in photonics. Further analysis suggests that the intrinsic bandwidth of such graphene FET based photodetectors may exceed 500 GHz. Most notably, the generation and transport of the photo-carriers in such graphene photodetectors are fundamentally different from those in currently known semiconductor photodetectors, leading to a remarkably high bandwidth, zero source-drain bias (hence zero dark current) operation, and good internal quantum efficiency.
Avouris Phaedon
Lin Yu-Ming
Mueller Thomas
Valdes-Garcia Alberto
Xia Fengnian
No associations
LandOfFree
Ultrafast graphene photodetector does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Ultrafast graphene photodetector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ultrafast graphene photodetector will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-555169