Electro-optical properties of new structure photodetectors based on graphene nanoribbons: an ab initio study

Abstract

In this paper, we propose photodetectors based on sandwiched graphene nanoribbons and investigate their optical and electrical characteristics. Here we combine three narrow armchair graphene (AGNRs) in a way that two AGNRs with the same width sandwich another AGNR with a different width and smaller length. Some of these structures produce sharp peaks in their absorption spectrum that increase selectivity in some frequencies. Some of the peaks shift to mid-infrared, and so are useful in various optical communication windows. These structures also increase the absorption coefficient at some wavelengths up to 90-fold. The responsivity peak shows a maximum of about a 52% increase. We also show that some of these structures can reduce dark current by about three times. Finally, we demonstrate the effect of channel length on dark current in these devices.

© 2016 Optical Society of America

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