High-Resolution In Situ Crystallization and Patterning of a CsPbBr3 Film via Femtosecond Laser Printing

Establishing high-precision patterning technology for high-quality perovskite films is critical for practical applications requiring optoelectronic device arrays. Here, we report a femtosecond laser printing strategy to realize high-precision and high-quality patterned perovskite films by integrating in situ crystallization and patterning in one printing step. Compared with a thermal-annealed CsPbBr3 film, the crystallization quality of a laser-printed film has been improved because of localized nucleation and growth at the laser-irradiated area, avoiding the incomplete film coverage and poor crystallization quality due to rapid solvent evaporation in the large area during the thermal annealing process. Also, high-resolution pixel arrays and designed patterns with a minimum line width of 2 μm have been demonstrated by means of the high precision of femtosecond laser printing. More importantly, we have fabricated a prototype of perovskite light-emitting diodes (LEDs) demonstrating the potential of femtosecond laser printing technology for the fabrication of high-precision patterned perovskite film optoelectronic devices for display application.