Graphene‐Conducting Polymer Hybrid Transparent Electrodes for Efficient Organic Optoelectronic Devices

Abstract

To achieve the broad utilization of the full functionality of graphene (GR) in devices, a transfer method should be developed that can simplify the process without leaving residue of the insulating supporting layer on the surface of GR. Furthermore, stable GR doping without the use of an insulating polymer is required. Here, a new GR transfer method that uses a popular conducting polymer, poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), is reported as a new supporting layer for the transfer of GR films that are synthesized by chemical vapor deposition. The GR/PEDOT:PSS bilayer can be directly utilized without the removal process. Therefore, this transfer method simplifies the transfer process and solves the residue problem of conventional transfer methods. The stable doping of GR films is simultaneously achieved by using the PEDOT:PSS layer. The new GR/PEDOT:PSS hybrid electrodes are fully functional in polymer solar cells and polymer light‐emitting diodes, outperforming the conventionally transferred GR electrodes and indium tin oxide electrodes.

Impact of synthesis routes on the chemical, optical, and electrical properties of graphene oxides and its derivatives

“…For the RGO films, such transfer process is not needed. to the previously observed value (4.3 eV) on graphene films [12].…”

“…9b. contrast to that on the transferred graphene films previously reported by our group [12]. The graphene was grown on a catalytic metal by chemical vapor deposition and were needed to be transferred to target substrates using an insulating polymer supporting layer.…”

New transfer method of CVD-grown graphene using a flexible, transparent and conductive polyaniline-rubber thin film for organic electronic applications

“…Graphene, a two dimensional carbon material, has attracted attention since 2004 due to its unique electronic and physical properties in addition to its exceptionally high crystallinity and electronic quality [3][4][5][6][7]. In this context, promising results were achieved in OPVs with the replacement of ITO by graphene transparent electrodes [8][9][10][11][12][13][14][15][16][17]. However, there are key factors that need to be addressed for the practical application of graphene, as a high-quality synthesis, residuefree transfer and stable doping [18,19].…”

Recent Advances in Nanostructured Conducting Polymers: from Synthesis to Practical Applications

“…For example, Lee et al [183] developed the so-called "doping transfer" approach, providing a unique solution to the residue problem of the PMMA-assisted method in graphene substrate transfer (Figure 10). There were two interesting points reported.…”