Abstract
The method of synthesis has a profound influence on the properties of carbon nanostructures endowed with quantum confinement. Here, we report synthesis method of the graphene quantum rings (GQRs) from pitch carbon fiber by a thermal hydrolysis process and their application in optoelectronic devices. Synthesized GQRs with excitation-dependent photoluminescence and excellent electrical conducting properties have a work function of −4.16 eV suitable for optoelectronic applications. The electrical properties of the GQRs are studied by metal–semiconductor–metal (MSM), field-effect transistor (FET), and hybrid (inorganic and organic) solar cell devices comprising the GQRs as the p-type channel and hole transporting material, respectively. The current–voltage (I–V) characteristic from a diode-type MSM device shows a conductance of 1.5 mA at 3.5 V in the dark. Under an illumination of 1.5 AM the current increases to 5.28 mA at 3.5 V, showing that these GQRs are very good candidates for photodiodes and other optoe...
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