Fabrication and characterization of electronic devices based on inkjet-printed two-dimensional materials

Thanks to their electrical, mechanical and optical properties, two-dimensional materials are promising candidates for the next generation of flexible and wearable electronic systems. The liquid phase exfoliation technique enables the production, on a large scale and at low cost, of a wide variety of two-dimensional materials in solution. Inkjet printing offers a fast and low-cost method for the deposition of two-dimensional materials in solution. However, several issues need to be addressed to achieve high performance electronic devices using this technology. In this thesis, water-based inks of two-dimensional materials have been used for the fabrication of inkjet printed electronic devices. First, the electrical properties of printed films of two-dimensional materials have been studied, in particular graphene and hexagonal boron nitride. The following part is based on the fabrication of field-effect transistors on paper substrate, initially by means of fully inkjet printed solutions, using graphene as channel material. Secondly, a hybrid approach has been adopted, in which the channel is molybdenum disulfide synthesized by chemical vapor deposition and then transferred on paper, while the other components of the device are printed. A detailed analysis of electrical low-frequency noise has also been carried out on these latter devices.