Destruction for growth: a novel laser direct writing perovskite strategy with intelligent anti-counterfeiting...

Perovskites are widely acknowledged as promising optoelectronic materials due to their superior carrier mobility, high optical absorption coefficient, and versatile structural design. Among the various synthesis methods, laser direct writing (LDW) of perovskites has demonstrated unique and promising applications in precise patterning and the fabrication of perovskite-based devices. In this study, we propose a novel mechanism for LDW perovskites: laser destruction-induced perovskite growth. Unlike previous LDW technologies that rely on thermal effects and photon absorption-induced nucleation, our approach uses a pulsed laser to rapidly disrupt the stress-rich perovskite precursor phosphate glass surface within a truly short duration. The release of stress and the reverse movement shear band effect of phosphate glass bring Cs, Pb, and Br atoms into closer proximity, facilitating the nucleation and growth of perovskite crystals. Meanwhile, the broken P-O-P bonds provide the necessary energy for this nucleation and growth process. Utilizing this mechanism, we have successfully etched intricate perovskite patterns on the glass surface with high precision. Furthermore, this unique light destruction-induced perovskite growth strategy can be integrated with artificial intelligence and deep learning algorithms to fabricate various anti-counterfeiting patterns. Our proposed laser destruction-induced precipitation strategy enriches the current understanding of LDW perovskites and demonstrates significant potential and promise in optoelectronics.