Chiral organic–inorganic hybrid perovskites synthesized using an acoustofluidic closed system

Abstract

Chiral organic–inorganic hybrid perovskite films hold significant promise for optoelectronic applications due to their unique optical activity and excellent optoelectronic properties. However, their air and moisture sensitivity necessitate inert atmosphere processing, hindering practical application. In this work, we present a closed acoustofluidic system utilizing surface acoustic wave-based microcentrifugation for the synthesis of high-quality (S-MBA)₂PbI₄ films. By confining both synthesis and film deposition within a sealed chamber, this approach eliminates air exposure, enabling the fabrication of films with enhanced crystallinity and a reduced band gap of 2.37 eV. The resulting chiral perovskite films exhibit significant circular dichroism, with an asymmetry factor of 9.3 × 10⁻⁴. Furthermore, control over film surface roughness (achieving <0.6 μm) is demonstrated through modulation of acoustic operation parameters. The cost-effectiveness and versatility of this acoustic microcentrifugation system highlight its potential for advanced film material fabrication.