Controlled Ligand-Free Growth of Free-Standing CsPbBr₃ Perovskite Nanowires

Summary, in English

Metal halide perovskite nanowires are widely studied due to their unique electronic and optical characteristics, making them promising for light emitting and detection applications. We developed a ligand-free method to grow vertically aligned free-standing CsPbBr₃ nanowires from anodized aluminum oxide nanopore substrates. Here, we investigate the growth process using in situ microscopy with ultraviolet and visible light excitation, revealing a highly dynamic process with pronounced fluorescence at locations where high-density free-standing nanowires could be found. The yield of the growth is strongly improved by using a growth reactor with controlled N₂ flow, increasing from 17 to 60%. We systematically investigated the growth dependence on the temperature and N₂ flow rate and identified optimal parameters at 70 °C and 0.8 L/min, respectively. The improved control over the growth of free-standing nanowires expands opportunities for their integration into optoelectronic devices.

• Author: Ziyun Huang; Zhaojun Zhang; Nils Lamers; Dmitry Baranov; Jesper Wallentin
• Department/s: LTH Profile Area: Nanoscience and Semiconductor Technology; NanoLund: Centre for Nanoscience; LU Profile Area: Light and Materials; Synchrotron Radiation Research; LTH Profile Area: Photon Science and Technology; Chemical Physics
• Publishing year: 2024-11-26
• Language: English
• Pages: 48390-48396
• Publication/Series: ACS Omega
• Volume: 9
• Issue: 49
• Links: http://dx.doi.org/10.1021/acsomega.4c06646
• Document type: Journal article
• Publisher: The American Chemical Society (ACS)
• Topic: Condensed Matter Physics (including Material Physics, Nano Physics)
• Status: Published
• ISBN/ISSN/Other: ISSN: 2470-1343