Abstract
Graphene nanoribbon (GNR), which has unique properties and advantages, is a crucial component of nanoelectornic devices, especially in the development of photoelectric detectors. In this work, an infrared photodetector based on the structure of stacked multiple-GNRs, which is separated by a little thick barrier layers (made of tungsten disulfide or related materials) to prevent tunneling current, is proposed and modeled. Operation of photoelectric detector is related to the electron cascaded radiative transition in the adjacent GNRs strengthened by the electrons heated due to the incident light. With a developed model, the working principle is analyzed and the relationships for the photocurrent and dark current as functions of the intensity of the incident radiation are derived. The spectral dependence of the responsivity and detectivity for graphene nanoribbons photodetector (GNRs-PT) with different Fermi energy, band gaps and numbers of GNRs layers are analyzed as well. The results demonstrate that the spectral characteristics depend on the GNRs band gap, which shows a potential on GNRs-PT application in the multi-wavelength systems. In addition, GNRs-PT has a better spectrum property and higher responsivity compared to photodetectors based on InxGaxAs in room temperature.
Highlights
Photoelectric detector is a key part of photoelectronic system, which is widely used in military, medical and civil fields
The results demonstrate that the spectral characteristics depend on the Graphene nanoribbon (GNR) band gap, which shows a potential on graphene nanoribbons photodetector (GNRs-PT) application in the multi-wavelength systems
A GNRs-PT based on multiple-GNR structures with thick barrier layers is established and intra-band and inter-band transitions theory in GNRs is proposed
Summary
Photoelectric detector is a key part of photoelectronic system, which is widely used in military, medical and civil fields. Spectrumselection can be realized.[13,14,15,16,17,18,19] Besides, the electronic relaxation time of the photoelectric detector manufactured with graphene nanoribbons (GNRs) is longer, which is helpful to generate the photon-excited electron and photocurrent. It can work at room temperature, and own much higher responsivity and detectivity than narrow-band semiconductor, quantum dot, and others photodetectors.[20,21,22]. The responsivity and the dark current limited detectivity of the designed detector are estimated
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