Fabrication and Characterization of Electronic Devices based on Innovative and Advanced Materials

This PhD thesis explores the design, fabrication, and characterization of advanced electronic devices based on two-dimensional (2D) materials and organic semiconductors. The research focuses on the unique properties of graphene, hexagonal boron nitride (hBN), transition metal dichalcogenides (TMDs), and the conductive polymer poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate) (PEDOT:PSS) to push the boundaries of electronic device performance. The work begins by investigating the fundamental properties of 2D materials synthesized through various methods, including mechanical exfoliation, chemical vapor deposition, and liquid phase exfoliation. Inkjet printing is then demonstrated as a scalable and versatile technique for depositing these materials, with emphasis on optimizing printing parameters and formulating suitable inks. The first experimental work focuses on the development of organic electrochemical transistors (OECTs) based on PEDOT:PSS. These devices are fabricated on unconventional substrates, such as waxy-sublimating materials, and their application as pH sensors is presented. The research further extends to the realm of inkjet-printed resistive sensors on flexible and paper-based substrates, where graphene-based pH sensors and PEDOT:PSS electrodes for humidity sensing are successfully demonstrated. The thesis also explores novel approaches to van der Waals heterostructures, including all-solution-processed methods, and mechanical exfoliation.