Journal
ACS NANO
Volume 12, Issue 6, Pages 6170-6178Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b02793
Keywords
cesium lead halide perovskite; aligned nanowires; multicolor lasers; exciton-polaritons; Rabi splitting
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Funding
- NSF of China [51525202, 51772084, 61574054, 61505051, 61635001]
- Hunan Province Science and Technology Plan [2014FJ2001, 2014TT1004]
- Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Fundamental Research Funds for the Central Universities
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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 similar to 210 +/- 13, 146 +/- 9, and 103 +/- 5 meV for the CsPbCl3, CsPbBr3, and CsPbX3 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.
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