Session 11: Flexible Electronics Applications II

Inkjet-Printing of Optoelectronics Sensors
Wednesday, February 14, 2018
5:00 PM - 5:20 PM

Over the last 25 years, INO has been recognized as a leader in optics/photonics. Recently, printable photonics research activities have emerged based on INO’s solid expertise in the field of microfabrication and MEMS sensors. The fabrication of flexible multilayered optoelectronic devices has been addressed through state-of-the-art printing equipment combining inkjet and aerosol technologies, and including in-situ IR and UV post-treatment capabilities. Specific fabrication strategies have been used to carefully control deposition of layers from a broad range of functional inks on a wide variety of flexible substrates, for adequate sensor prototyping. In addition to the effects of jetting parameters, the influence of substrate wettability on drops coalescence forming a final percolated layer has been studied, supported by optical methods to quantify the percentage of surface coverage. The definition of critical feature dimensions of ~20μm width and ~10μm gap has also been achieved. This provides guidelines to further assess prototype fabrication towards future industrial scale-up manufacturing. Printable perovskite-based photodetector prototypes with a crystalline Methylammonium Lead Trihalide Perovskite ink layer sandwiched between HTL spiro and ETL TiO2 ink materials have been fabricated onto flexible polyimide substrates using various NIR and UV annealing means. The results of optoelectronics characterization from spectrally-calibrated I-V photocurrent measurements will be presented.