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

Abstract

A facile method was developed for the doping of graphene nanosheets grown via chemical vapor deposition (CVD) for all graphene-based 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.