Graphene Quantum Rings Doped PEDOT:PSS Based Composite Layer for Efficient Performance of Optoelectronic Devices

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 excitationdependent 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 optoelectronic properties. The GQRs doped poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) composite layer served as an efficient hole extraction layer in hybrid solar cells, which shows excellent power conversion efficiency as maximum as 7.4%. Such performances of the devices are attributed to the unique electrical properties and hole extraction applicability of the GQRs. These results demonstrate the great potential of GQRs for future electronic and other optoelectronic devices.

Lattice thermal conductivity of graphene nanostructures

“…GNRs, such as quantum nanorings [24][25][26][27][28], that can show ballistic transport and consequently are good candidates to exploit quantum effects even at room temperature. Although ballistic electron transport yields higher values of both σ and κ el , it turns out that the ratio S 2 σ/κ el becomes largely enhanced in quantum nanorings due to the occurrence of Fano anti-resonances [29].…”

Top‐Down Synthesis of Hollow Graphene Nanostructures for Use in Resistive Switching Memory Devices

“…www.advelectronicmat.de area electron diffraction (SAED) patterns for the areas shown in Figure 1e,f, respectively. [31] In addition, it is apparent that the inner region of the rings is completely empty, indicating that the formed rings are not carbon onions. In order to image a single GNR, the solution containing the NPs formed in P4VP was diluted and sonicated several times.…”

“…The average size of the GNRs was ≈10 nm while the width of the GNRs was 2-3 nm and corresponded to 6-9 layers, which are significantly fewer than those of typical carbon onions. [31] In addition, it is apparent that the inner region of the rings is completely empty, indicating that the formed rings are not carbon onions. [32] The high-resolution transmission electron microscopy (HRTEM) images of the GNRs show that they exhibit high crystallinity and have a lattice spacing of 0.32-0.35 nm owing to the sp 2 clusters in graphene.…”

Polymer/Graphene Hybrids for Advanced Energy‐Conversion and ‐Storage Materials

“…for the fabrication of a highly efficient hole‐extraction layer in solar cells. The as‐prepared GQD‐doped PEDOT:PSS composite shows an excellent PCE of 7.4 % (Figure ) …”