The availability of printable dielectric materials and their printability is one of the major roadblocks to printed flexible electronics. Here, we report the performance of fully printed field-effect transistors using polyvinyl alcohol (PVA) as dielectric and carbon nanotube (CNT) as a semiconducting layer. As fewer numbers of research are available on printed PVA films, here we investigate ink formulation and printing parameters for PVA and their effects on device performances. Aerosol jet Printer was used to obtain a highly dense CNT network and pinhole-free thin PVA dielectric layer that resulted in a high on/off ratio and drain current. This completely printed transistor with polymer dielectric will be a great contribution to flexible electronic devices.

The charge photogeneration phenomenon in organic semiconducting materials gains great interest due to its application in organic solar cells or photosensitive devices. Here we report the temporal evolution of the photogenerated charge in organic field-effect transistors. Since the charge transfer can be ruled by the drift or diffusion processes, the gate-voltage dependence is used to distinguish the driving force.

This PDF file contains the front matters associated with SPIE Proceedings Volume 12211, including the Title Page, Copyright information, Table of Contents and Conference Committee list.