|Thesis abstract: |
Organic electronics can provide advantages in the field of large-area imaging with respect to inorganic-based electronics, thanks to the possibility of adopting solution-based, low thermal budget, scalable deposition techniques. To fabricate complex optoelectronic systems, different devices have to be integrated onto the same substrate and this requires the adoption of a patterning deposition scheme. To this extent, in this work we exploit drop-on-demand inkjet printing, an additive patterning technique which gives the possibility to deliver small quantities of functional materials formulated into inks on almost arbitrary substrates. We aim at integrating a photodiode and an addressing transistor in order to fabricate a printed organic passive pixel. Inkjet printing of such a complex multilayer structure poses a number of issues, from proper ink formulation to device integration and process engineering in addition to fundamental transport and light-matter interaction studies. To solve this puzzle, a multidisciplinary approach at the boundary among physics, chemistry and engineering is mandatory. The ultimate product of this research will be a XbX array of pixels, developed and optimized to be employed as a prototypical X-ray imager (based on an indirect photoconversion scheme) suitable for biomedical applications.