High-Stability Flexible Patterned Perovskite Optoelectronic Structures Fabricated by a Laser Pyrolysis Assisted Process

Flexible patterned metal halide perovskites (MHPs) are promising to improve the perovskite-based optoelectronic devices for applications in healthcare monitoring, flexible displays, solar cells, etc. However, their poor environmental stability and device robustness are the main obstacles for commercialization. Herein, a laser pyrolysis assisted process is developed to fabricate flexible patterned CsPbBr3 structures with high stability and flexibility. A CO2 laser is applied to micromachine the designed patterns on the flexible polydimethylsiloxane (PDMS) substrates by inducing the pyrolysis of PDMS. The CsPbBr3 quantum dots (QDs) solution is precisely filled into the patterned PDMS substrates, and subsequently sealed by another layer of PDMS on the top. To ensure the surface smoothness of the patterned PDMS for CsPbBr3 QDs embedment, the mechanism of the laser pyrolysis process is investigated by characterizing the PDMS pyrolysis products obtained at different laser energy densities. To demonstrate the high stability of the fabricated flexible patterned CsPbBr3 structures, the photoluminescent (PL) spectra of the samples are monitored for 60 days both in air and in the water. The flexibility of the fabricated structures is estimated by monitoring their PL emission under applied tension and bending. These flexible patterned CsPbBr3 structures are promising for applications in flexible optical/optoelectronic devices.