Au-Seeded CsPbI3 Nanowire Optoelectronics via Exothermic Nucleation

作者：Meng, You; Zhang, Yuxuan; Lai, Zhengxun; Wang, Wei; Wang, Weijun; Li, Yezhan; Li, Dengji; Xie, Pengshan; Yin, Di; Chen, Dong; Liu, Chuntai; Yip, SenPo; Ho, Johnny C.^*

来源：Nano Letters, 2023, 23(3): 812-819.

DOI：10.1021/acs.nanolett.2c03612

• vapor-liquid-solid synthesis
• Au seeds
• CsPbI3 nanowires
• exothermic nucleation
• optoelectronics

Converting vapor precursors to solid nanostructures via a liquid noble-metal seed is a common vapor deposition principle. However, such a noble-metal-seeded process is excluded from the crystalline halide perovskite synthesis, mainly hindered by the growth mechanism shortness. Herein, powered by a spontaneous exothermic nucleation process (Delta H < 0), the Au-seeded CsPbI3 nanowires (NWs) growth is realized based on a vapor-liquid-solid (VLS) growth mode. It is energetically favored that the Au seeds are reacted with a Pb vapor precursor to form molten Au-Pb droplets at temperatures down to 212 degrees C, further triggering the low-temperature VLS growth of CsPbI3 NWs. More importantly, this Au-seeded process reduces in-bandgap trap states and consequently avoids Shockley-Read-Hall recombination, contri-buting to outstanding photodetector performances. Our work extends the powerful Au-seeded VLS growth mode to the emerging halide perovskites, which will facilitate their nanostructures with tailored material properties.

• 单位
  郑州大学