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Title: Light-assisted recharging of graphene quantum dots in fluorographene matrix

In the present study, the charge transient spectroscopy was used to analyze the transient relaxation of charges in graphene and bilayer-graphene quantum dot (QD) systems formed by chemical functionalization of graphene and few-layer graphene layers. A set of activation energies (one to three different values) for the emission of charges from QDs sized 50 to 70 nm, most likely proceeding via the thermal activation of charge carriers from QD quantum confinement levels, were deduced from measurements performed in the dark. Daylight illumination of samples during measurements was found to result in a strong decrease of the activation energies and in an involvement of an athermal process in the charge relaxation phenomenon. The time of the light-assisted emission of charge carriers from QDs proved to be two to four orders of magnitude shorter than the time of their emission from QDs under no-illumination conditions.
Authors:
 [1] ;  [2] ; ;  [1] ; ;  [3]
  1. A.V. Rzhanov Institute of Semiconductor Physics, Russian Academy of Sciences, Siberian Branch, Acad. Lavrentiev Avenue 13, Novosibirsk 630090 (Russian Federation)
  2. (Russian Federation)
  3. North - East Federal University, Yakutsk (Russian Federation)
Publication Date:
OSTI Identifier:
22305768
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ACTIVATION ENERGY; CHARGE CARRIERS; CONFINEMENT; DAYLIGHTING; EMISSION; GRAPHENE; GROUNDWATER RECHARGE; ILLUMINANCE; LAYERS; MATRIX MATERIALS; NANOMATERIALS; NANOSTRUCTURES; QUANTUM DOTS; RELAXATION; SPECTROSCOPY; TRANSIENTS; VISIBLE RADIATION