Journal
NANO ENERGY
Volume 92, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106778
Keywords
Perovskite; Heterostructure; On-wire bandgap integration; Asymmetric waveguide; Dual-wavelength lasing
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Funding
- Taiyuan University of Technology and Shanxi Basic Research Program Project [20210302123128]
- CityU SGP [9380076]
- General Research Fund of the Research Grants Council of Hong Kong SAR, China [CityU 11306520]
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This study reports a direct vapor-phase growth of high-quality CsPbCl3/CsPbI3 axial perovskite heterostructure and multi-heterojunction nanowires using a newly developed magnetic-pulling chemical vapor deposition approach. The structures exhibit crystalline properties with dual-wavelength emissions, demonstrating the formation of unique heterostructures. The capability to synthesize on-wire heterostructures represents a major step toward high-integration optoelectronic circuits and nanophotonics.
All-inorganic lead halide perovskites have attracted tremendous attention for their tunable bandgaps, excellent photoluminescence efficiency and robust stability. Here, we report on a direct vapor-phase growth of highquality CsPbCl3/CsPbI3 axial perovskite heterostructure and multi-heterojunction nanowires using a newly developed magnetic-pulling chemical vapor deposition approach. Microstructural characterization and optical investigations reveal that these structures are crystalline with abrupt heterojunctions. Micro-photoluminescence spectra and mapping at the heterojunctions exhibit dual-wavelength emissions at 417 nm and 698 nm, from the adjacent two disparate perovskites, respectively, further demonstrating the formation of unique heterostructures. Additionally, under a focused laser illumination, asymmetrical waveguide behavior along a single CsPbCl3/ CsPbI3 wire is clearly observed. Taking a step further, we fabricated a monolithic dual-wavelength laser using an on-wire axial perovskite heterostructure and successfully realized blue and red emissions (425.5 nm and 687.4 nm). The capability to synthesize on-wire heterostructures represents a major step toward high-integration optoelectronic circuits and nanophotonics.
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