Combinatorically Inkjet-Printed Metal Halide Perovskite Optoelectronic Devices

Beyond the use in home and office-based printers, inkjet printing has become a popular structuring and selective deposition technique. More recently great interest also exists in emerging industrial areas like in the manufacturing of printed circuit boards, solar cells, flexible organic electronic and medical products.<br/>Metal halide perovskites (MHP) have received great attention in recent years, predominantly due to the high performance of perovskite solar cells. The versatility of the material has also allowed its use in light-emitting diodes and photo detectors, amongst other optoelectronic device applications. In these device applications the tunability of the energy bandgap is of particular importance. In contrast to other semiconducting material classes the energy bandgap in MHPs can be easily tuned by controlling the halide ratio in the compositions using pure and mixed halide gradients ranging from pure MAPbI3 via MAPbBr3 to MAPbCl3. Moreover, the drop-on-demand capabilities of inkjet printing enable the deposition of the MHP inks in a precise ratio to produce specific perovskite compositions with dedicated energy bandgaps in the printed thin film. By this means we can fabricate multiple perovskite compositions absorbing or emitting light at specific wavelengths in a single printing step. Using various mixed halide perovskites, we will show the fabrication of combinatoricallyprinted photodetector arrays [1,2] as well as large area multi color light emitting devices [3].<br/><br/>[1] Schröder, V. R. F. et al. Using Combinatorial Inkjet Printing for Synthesis and Deposition of Metal Halide Perovskites in Wavelength Selective Photodetectors. Advanced Engineering Materials (2021).<br/>[2] Näsström, H. et al. Combinatorial inkjet printing for compositional tuning of metal-halide perovskite thin films. Journal of Materials Chemistry A (2022).<br/>[3] Hermerschmidt, F.<i> et al.</i> Finally, inkjet-printed metal halide perovskite LEDs – utilizing seed crystal templating of salty PEDOT:PSS. <i>Materials Horizons</i> <b>7</b>, 1773-1781 (2020).