Work function-tunable transparent electrodes based on all graphene-based materials for organic-graphene photodetectors

A facile method was developed for the doping of graphene nanosheets grown via chemical vapor deposition (CVD) for all graphenebased organic hybrid devices. Graphene oxide (GO) functionalized with organic ligands was employed as a dopant for CVD graphene. The doping effects from functionalized-GO with various work function (WF) values were verified by ultraviolet photoelectron spectroscopy and Raman spectroscopy analysis. In addition, the study also demonstrated easily controlled photodetectors based on WF-tuned graphene and photosensitive organic thin layers. A hybrid deposition system that combines thermal evaporation and vapor-phase metalation was utilized for the preparation of tunable photosensitive organic layers such as metalloporphyrin. This work represents a major breakthrough in the manufacturing of advanced all graphene-based hybrid devices such as flexible devices, organic transistors, and chemical sensors.