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.
Anti-solvent-free one-step deposition of perovskite thin film shows promising potential for application in slot-die or roll-to-roll mass-fabrication processes of perovskite solar cells. The continuous coverage was confirmed by PV response of devices made using the one-step deposition process. In this work, we have developed a process to deposit MAPb0.75Sn0.25(I0.5Br0.5)3 perovskite thin films without anti-solvent adding MAAc to the ink. By varying the Br content of the perovskite precursor, we were able to tune the bandgap. Fabricated solar cells with the structure ITO/CuI/ MAPb0.75Sn0.25(I0.5Br0.5)3 /C60/BCP/Al with PCE of 4.59% show the path of the fabrication process of antisolvent-free tin-lead-based solar cells
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