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

Abstract

Emerging organic-inorganic metal halide perovskite materials have become the focus of the optoelectronics research community owing to their excellent photoelectric properties. Nevertheless, challenges still exist for transferring the lab-made devices to largearea industrial modules. Inkjet printing (IJP) technology provides a promising way to fill the gap because of its precise droplet control and uniform large-scale deposition functions. Hence, an in-depth understanding of inkjet-printed perovskite films in terms of droplet manipulation and crystallization regulation is critical for upscaling the perovskite devices to commercial usage. In this review, we give an overview of inkjet-printed high-quality perovskite films and provide guidelines on inkjet-printing large-scale highperformance perovskite devices. First, we analyze theories of droplet formation and perovskite nucleation/ crystallization dynamics and then focus on summarizing the perovskite film-formation strategies via IJP, in the aspects of ink engineering, the printing process, and posttreatment. Furthermore, we review the recent advances of inkjet-printed perovskite films on optoelectronic devices, such as perovskite solar cells, perovskite light-emitting diodes, and perovskite photodetectors. Finally, we highlight the "Trilogy Strategies," including ink engineering, printing process, and posttreatment for printing high-quality perovskite films