Droplet Manipulation and Crystallization Regulation in Inkjet-Printed Perovskite Film Formation

Abstract

The emerging organic-inorganic metal halide perovskite materials have been the focus 3 of the optoelectronic research community owing to their excellent photoelectric 4 properties. Nevertheless, there still exist challenges for transferring the lab-made 5 devices to large-area industrial modules. Inkjet printing (IJP) technology provides a 6 promising way to fill the gap because of its precise droplet control and uniform large-7 scale deposition functions. Hence, an in-depth understanding of inkjet-printed 8 perovskite films from the aspects of droplet manipulation and crystallization regulation 9 is critical for upscaling the perovskite devices to commercial usage. In this review, we 10 give an overview on the inkjet-printed high-quality perovskite films, and provide 11 guidelines on inkjet-printing large-scale high-performance perovskite devices. First, we 12 analyze theories of droplet formation and perovskite nucleation/crystallization 13 dynamics, and then focus on summarizing the perovskite film-formation strategies via 14 IJP, in the aspect of ink engineering, printing process and post treatment. Furthermore, 15 we review the recent advances of inkjet-printed perovskite films on optoelectronic 16 devices such as perovskite solar cells (PSCs), perovskite light-emitting diodes (PeLEDs) 17 and perovskite photodetectors (PDs). Finally, we propose the challenges on how to 18 obtain high-quality inkjet-printed perovskite films, and highlight the "Trilogy 19 Strategies" of printing high-quality perovskite films aiming for high-performance 20 optoelectronic devices.

High-performance large-area perovskite photovoltaic modules

“…The perovskite ink is uniformly printed on the predesigned position by a digital procedure with the print nozzle relative motion on the substrate. The film thickness is finely affected by the size, movement speed and trajectory of the droplets through the nozzle , and the frequency and amplitude of the digital pulses [54]. The raw materials are highly utilized and multiple head printing can be realized to meet the needs of industrial production.…”

Inkjet printing for scalable and patterned fabrication of halide perovskite-based optoelectronic devices

“…For inkjet printing of perovskite optoelectronic devices, four processes are considered as the key steps to be addressed: ink preparation, droplet ejection, evaporation, and crystallization, 31 as shown in Fig. 1.…”

“…24,29,30 Although IJP has only been recently employed in the fabrication of perovskite optoelectronic devices, significant progress and very broad applications have been reported, demonstrating its promising bright future. While previous reviews 31,32 have covered droplet manipulation and crystallization regulation in piezoelectric inkjet printed MHP films, this review focuses on patterning of MHPs by using different IJP technologies to achieve a higher resolution, a wider ink applicability, and a better film morphology. Meanwhile, the prospects for future development and industrial commercialization challenges of IJP in the fabrication of various MHP devices are discussed.…”

Unencapsulated CsPbClBr2 Film Photodetectors Grown by Thermal Vacuum Deposition Exhibit Exceptional Environmental Stability in High-Humidity Air

“…More relevantly, it has lower cost compared with traditional semiconductor optoelectronic materials such as silicon, gallium arsenide, silicon carbide, etc. Hitherto, materials based on the organic–inorganic hybrid perovskite have been making great progress and have found wide application in PDs. , For example, the Song group reported a lithography-free method to realize the controllable growth of perovskite single-crystal arrays by introducing a printed hydrophilic and hydrophobic substrate into the crystallization system, which demonstrates a simple method to fabricate perovskite single-crystal arrays on a large scale and opens up a way to produce a variety of perovskite photoelectric devices . In the same year, they reported a facile method to print large-scale perovskite films with high quality for flexible PDs.…”