Water-Based and Defect-Free 2D Material Inks for Printed Electronics

Solution processing of 2D materials allows simple and low-cost techniques, such as ink-jet printing, to be used for fabrication of heterostructure-based devices of arbitrary complexity [1]. Our group has developed highly concentrated, defect-free, printable and water-based 2D crystal formulations, enabling fabrication of large area arrays of photosensors on plastic [2], printed capacitors [3], transistors [3,4], and memristors on both rigid and flexible substrates [5]. Furthermore, we have demonstrated simple and scalable fabrication of graphene-silicon rectifying devices with ON/OFF ratio higher than three orders of magnitude and a remarkable photovoltaic effect, whose fabrication is compaticle with back-end-of-line fabrication processes [6]. Finally, inkjet printing can be easily combined with 2D materials produced by chemical vapour deposition, allowing simple and quick fabrication of complex circuits on paper, such as high-gain inverters, logic gates, and current mirrors [7].<br/><br/>References<br/>[1] Conti et al, Nature Rev. accepted 2023; [2] McManus et al, Nature Nano, 12, 343 (2017) [3] Worsley et al, ACS Nano (2018), DOI: 10.1021/acsnano.8b06464 [4] Lu et al, ACS Nano, 13, 11263 (2019); [5] Peng et al, submitted; [6] Grillo et al, <i>ACS Nano</i> (2023), 17, 1533 ; [7] Conti et al, Nature comms, 11, 1 (2020).