Infrared-photovoltaic properties of graphene revealed by electro-osmotic spray direct patterning of electrodes

Although two-dimensional thin-film nanostructures such as graphene are extremely promising for future optical or electronic devices, the required manufacturing technologies are still lacking. Herein the authors introduce a robotically controlled electro-osmotic spray deposition method of colloids with a high electric potential to create optoelectronic devices directly onto the surface of graphene. Since the process does not require a clean room or lithography method, pure graphene optoelectronic devices can be manufactured at a low cost. Moreover, preliminary experiments revealed that the manufactured graphene optoelectronic devices have excellent photoelectric properties in the infrared wavelengths.