Wang Xiaoxia, Shoaib Muhammad, Wang Xiao, Zhang Xuehong, He Mai, Luo Ziyu, Zheng Weihao, Li Honglai, Yang Tiefeng, Zhu Xiaoli, Ma Libo, Pan Anlian
Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, and School of Physics and Electronics , Hunan University , Changsha , Hunan 410082 , People's Republic of China.
Institute for Integrative Nanosciences , Leibniz IFW Dresden , Helmholtzstraße 20 , 01069 Dresden , Germany.
ACS Nano. 2018 Jun 26;12(6):6170-6178. doi: 10.1021/acsnano.8b02793. Epub 2018 Jun 14.
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.
卤化铯铅钙钛矿纳米线已成为用于集成光子应用的有前途的低维半导体结构。了解纳米线腔中的光与物质相互作用对于设计低功耗纳米级光源具有重要的理论和实际意义。在这项工作中，通过气相生长法在退火的M面蓝宝石衬底上合成了高质量的面内取向卤化钙钛矿CsPbX（X = Cl、Br、I）纳米线。基于生长后的取向CsPbX纳米线，在室温下实现了大面积纳米线激光阵列，其具有相当低的泵浦阈值、非常高的品质因数和高度的线偏振。更重要的是，发现在脉冲激光激发下纳米线中形成了激子极化激元，这表明在由卤化铯铅钙钛矿制成的光学微腔中存在强激子 - 光子耦合。这些CsPbX纳米线中的耦合强度取决于原子组成，其中对于CsPbCl、CsPbBr和CsPbI纳米线，获得的室温拉比分裂能量分别约为210±13、146±9和103±5毫电子伏特。这项工作为全无机钙钛矿CsPbX纳米线在发光器件和集成纳米光子系统设计中的实际应用提供了基本见解。
