Huang Ziyun, Zhang Zhaojun, Lamers Nils, Baranov Dmitry, Wallentin Jesper
Synchrotron Radiation Research and NanoLund, Department of Physics, Lund University, Box 124, Lund 22100, Sweden.
Division of Chemical Physics and NanoLund, Department of Chemistry, Lund University, Box 124, Lund 22100, Sweden.
ACS Omega. 2024 Nov 26;9(49):48390-48396. doi: 10.1021/acsomega.4c06646. eCollection 2024 Dec 10.
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 CsPbBr nanowires from anodized aluminum oxide nanopore substrates. Here, we investigate the growth process using 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 N flow, increasing from 17 to 60%. We systematically investigated the growth dependence on the temperature and N 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.
金属卤化物钙钛矿纳米线因其独特的电子和光学特性而受到广泛研究，这使其在发光和检测应用方面具有广阔前景。我们开发了一种无配体方法，可从阳极氧化铝纳米孔基板上生长垂直排列的独立式CsPbBr纳米线。在此，我们使用紫外光和可见光激发显微镜研究生长过程，发现在高密度独立式纳米线所在位置存在明显荧光的高度动态过程。通过使用具有可控氮气流的生长反应器，生长产率大幅提高，从17%增至60%。我们系统研究了生长对温度和氮气流速的依赖性，并分别确定了70°C和0.8 L/min的最佳参数。对独立式纳米线生长的更好控制为其集成到光电器件中拓展了机会。
