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High-Quality In-Plane Aligned CsPbX3 Perovskite Nanowire Lasers with Composition-Dependent Strong Exciton–Photon Coupling
ACS Nano ( IF 17.1 ) Pub Date : 2018-06-11 00:00:00 , DOI: 10.1021/acsnano.8b02793
Xiaoxia Wang 1 , Muhammad Shoaib 1 , Xiao Wang 1 , Xuehong Zhang 1 , Mai He 1 , Ziyu Luo 1 , Weihao Zheng 1 , Honglai Li 1 , Tiefeng Yang 1 , Xiaoli Zhu 1 , Libo Ma 2 , Anlian Pan 1
Affiliation  

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 CsPbX3 (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 CsPbX3 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 CsPbX3 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 CsPbCl3, CsPbBr3, and CsPbI3 nanowires, respectively. This work provides fundamental insights for the practical applications of all-inorganic perovskite CsPbX3 nanowires in designing light-emitting devices and integrated nanophotonic systems.

中文翻译:

高质量面内对准的CsPbX 3钙钛矿纳米线激光器,具有依赖成分的强激子-光子耦合

卤化铯铅钙钛矿纳米线已经成为有前途的用于集成光子应用的低维半导体结构。在设计低功耗纳米级光源时,了解纳米线腔体中的光-物质相互作用既具有基本意义,也​​具有实际意义。在这项工作中,高质量的面内排列的卤化物钙钛矿CsPbX 3(X = Cl,Br,I)纳米线是通过气相生长法在退火的M面蓝宝石衬底上合成的。基于成对的CsPbX 3,已经实现了大面积的纳米线激光器阵列室温下具有非常低的泵浦阈值,非常高的品质因数和高度线性极化的纳米线。更重要的是,发现在脉冲激光的激发下,纳米线中形成了激子-极化子,这表明卤化铯铅钙钛矿制成的光学微腔中有很强的激子-光子耦合。这些CsPbX 3纳米线的耦合强度取决于原子组成,其中CsPbCl 3,CsPbBr 3和CsPbI 3的室温拉比分裂能为〜210±13、146±9和103±5 meV。纳米线。这项工作为全无机钙钛矿CsPbX 3的实际应用提供了基础见解。 纳米线设计发光器件和集成纳米光子系统。
更新日期:2018-06-11
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