Evaporation and deposition of perovskite multisolvent nanoinks

Perovskite is a promising material candidate for solar energy harvest and extensively studied. To make uniform, large-area, high-quality deposition of perovskite films, inkjet printing is expected to be an appropriate versatile fabrication process. To prevent the coffee-ring effect and to improve the evaporation control, we examine a feasibility of perovskite multisolvent nanoinks that consist of perovskite nanoparticles and two solvents with large and slow evaporation rates. Particularly, we observe a variety of evaporation dynamics and deposit patterns of perovskite multisolvent nanoinks, which deviate from classical models for evaporation dynamics. To understand complexity in evaporation and deposition of perovskite multisolvent nanoinks, we suggest a new physical model that quite well works in perovskite multisolvent nanoinks. Based on high-resolution, high-speed microscopic observations with X-ray nanotomography and light holographic microscopy, we develop an idea to control evaporation and deposition of perovskite multisolvent nanoinks.

Keyword:multisolvent,evaporation,deposition