Zhang Zhaojun, Lamers Nils, Sun Chen, Hetherington Crispin, Scheblykin Ivan G, Wallentin Jesper
Synchrotron Radiation Research and NanoLund, Department of Physics, Lund University, Box 124, Lund 22100, Sweden.
Chemical Physics and NanoLund, Department of Chemistry, Lund University, Box 124, Lund 22100, Sweden.
Nano Lett. 2022 Apr 13;22(7):2941-2947. doi: 10.1021/acs.nanolett.2c00137. Epub 2022 Mar 24.
Vertically aligned metal halide perovskite (MHP) nanowires are promising for various optoelectronic applications, which can be further enhanced by heterostructures. However, present methods to obtain free-standing vertically aligned MHP nanowire arrays and heterostructures lack the scalability needed for applications. We use a low-temperature solution process to prepare free-standing vertically aligned green-emitting CsPbBr nanowires from anodized aluminum oxide templates. The length is controlled from 1 to 20 μm by the precursor amount. The nanowires are single-crystalline and exhibit excellent photoluminescence, clear light guiding and high photoconductivity with a responsivity of 1.9 A/W. We demonstrate blue-green heterostructured nanowire arrays by converting the free-standing part of the nanowires to CsPbClBr in an anion exchange process. Our results demonstrate a scalable, self-aligned, and lithography-free approach to achieve high quality free-standing MHP nanowires arrays and heterostructures, offering new possibilities for optoelectronic applications.
垂直排列的金属卤化物钙钛矿（MHP）纳米线在各种光电子应用中具有广阔前景，通过异质结构可进一步提升其性能。然而，目前获得独立的垂直排列MHP纳米线阵列和异质结构的方法缺乏应用所需的可扩展性。我们采用低温溶液法，通过阳极氧化铝模板制备出独立的垂直排列的绿色发光CsPbBr纳米线。通过前驱体用量将纳米线长度控制在1至20μm之间。这些纳米线为单晶结构，具有出色的光致发光性能、清晰的光导性能和高光导率，响应度为1.9 A/W。我们通过在阴离子交换过程中将纳米线的独立部分转化为CsPbClBr，展示了蓝绿色异质结构纳米线阵列。我们的研究结果展示了一种可扩展、自对准且无需光刻的方法，以实现高质量的独立MHP纳米线阵列和异质结构，为光电子应用提供了新的可能性。
