The primary barrier to wider commercial adoption of graphene lies in reducing the sheet
resistance of the transferred material without compromising its high broad-band optical
transparency, ideally through the use of novel transfer techniques and doping strategies.
Here, chemical vapour deposited graphene was uniformly transferred to polymer supports by
thermal and UV approaches and the time-dependent evolution of the opto-electronic
performance was assessed following exposure to three kinds of common graphene dopants.
Doping with FeCl3 and SnCl2 showed minor, and notably time unstable, enhancement in the
σopt/σdc figure of merit, whilst AuCl3-doping markedly reduced the sheet resistance by 91.5% to 0.29 kΩ/sq for thermally transferred samples and by 34.4% to 0.62 kΩ/sq for UVtransferred samples offering a means to fabricating viable transparent flexible conductors
that near the indium tin oxide benchmarkM. T. Cole thanks the Winston Churchill Trust and the International Young Scientist Research
Fellowship, National Natural Science Foundation of China, for generous financial support.This is the author accepted manuscript. The final version is available at http://digital-library.theiet.org/content/journals/10.1049/iet-cds.2014.0074
