Squeezed-Out Technique To Prepare High-Quality PbBr-Based Layered Perovskite Langmuir–Blodgett Films Applicable to Cavity Polariton Devices

• Published in: Langmuir Vol. 35; no. 37; pp. 12224 - 12228
• Main Authors: Era, Masanao, Takada, Noriyuki
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 17.09.2019
• ISSN: 0743-7463; 1520-5827
• DOI: 10.1021/acs.langmuir.9b00473

We propose a promising preparation technique to construct optically high-quality Langmuir–Blodgett (LB) films of lead bromide-based layered perovskites having an organic–inorganic quantum-well structure called “squeezed-out technique.” Using this technique, we successfully prepared PbBr-based layered perovskite LB films whose average roughness is small enough to apply them for cavity polariton devices. The small roughness reveals that one can prepare microcavities having a high quality factor by using the technique. In addition, optical simulation of a cavity using the LB film demonstrated that the cavity polariton device has a large Rabi splitting of 116 meV, suggesting a stable polariton formation in the cavity even at room temperature.