High-Quality In-Plane Aligned CsPbX₃ Perovskite Nanowire Lasers with Composition-Dependent Strong Exciton–Photon Coupling

Abstract

Cesium lead halide perovskite nanowires have emerged as promising low-dimensional semiconductor structures for integrated photonic applications. Understanding light-matter interactions in a nanowire cavity is of both fundamental and practical interest in designing low-power-consumption nanoscale light sources. In this work, high-quality in-plane aligned halide perovskite CsPbX (X = Cl, Br, I) nanowires are synthesized by a vapor growth method on an annealed M-plane sapphire substrate. Large-area nanowire laser arrays have been achieved based on the as-grown aligned CsPbX nanowires at room temperature with quite low pumping thresholds, very high quality factors, and a high degree of linear polarization. More importantly, it is found that exciton-polaritons are formed in the nanowires under the excitation of a pulsed laser, indicating a strong exciton-photon coupling in the optical microcavities made of cesium lead halide perovskites. The coupling strength in these CsPbX nanowires is dependent on the atomic composition, where the obtained room-temperature Rabi splitting energy is ∼210 ± 13, 146 ± 9, and 103 ± 5 meV for the CsPbCl, CsPbBr, and CsPbI nanowires, respectively. This work provides fundamental insights for the practical applications of all-inorganic perovskite CsPbX nanowires in designing light-emitting devices and integrated nanophotonic systems.

Unveiling the Photo‐ and Thermal‐Stability of Cesium Lead Halide Perovskite Nanocrystals

“…CsPbX 3 nanocrystals have been incorporated into solar cells achieving a record 13.4 % power conversion efficiency (PCE). [6][7][8][9][10] In addition to light absorption or conversion for energy capture, these materials have been reported for possible use in laser media, [11][12][13][14] LEDs, [15][16][17][18] and photodetectors. [12,[19][20] Most reported syntheses of CsPbX 3 follow the work of Protesescu et al who demonstrated a simple, solution-based synthesis for nanocrystals with high luminescence.…”

An All‐Inorganic Perovskite‐Phase Rubidium Lead Bromide Nanolaser

“…This new perovskite can serve as ag ain medium and microcavity to achieve broadband (475-540 nm) single-mode lasing with ahigh Qofabout 2100.All-inorganic metal halide perovskites of the form CsPbX 3 (X = Cl, Br,I ), owing to their remarkable properties,a re attracting increasing attention for use in optoelectronic devices such as solar cells,l ight-emitting diodes (LEDs), and semiconductor nanolasers. [1][2][3][4][5][6][7][8][9][10] Such all-inorganic perovskites exhibit superior properties,including improved photo-…”

Low‐dimensional metal halide perovskites and related optoelectronic applications

“…Anisotropic nanowires can serve as a waveguide along the axial direction, and the two end facets can form a Fabry‐Perot cavity for optical amplification . Therefore, the single‐crystalline perovskite nanowires with ideal facets are good candidates for the optically pumped lasers.…”

“…Anisotropic nanowires can serve as a waveguide along the axial direction, and the two end facets can form a Fabry-Perot cavity for optical amplification. 187,206 Therefore, the single-crystalline perovskite nanowires with ideal facets are good candidates for the optically pumped lasers. The first lead halide perovskite nanowire-based laser was demonstrated by Zhu et al (Figure 12A) from a room-temperature solution method, showing wavelength-tunable lasing with very low thresholds (220 nJ cm −2 ) and a high-quality factor (Q~3600) ( Figure 12B).…”