Yu Huiwu, Zhao Wenhao, Ren Long, Wang Hongyue, Guo Pengfei, Yang Xiaokun, Ye Qian, Shchukin Dmitry, Du Yi, Dou Shixue, Wang Hongqiang
State Key Laboratory of Solidification Processing Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, 710072, P. R. China.
School of Physics, Northwest University, Xi'an, 710127, P. R. China.
Adv Mater. 2020 Aug;32(34):e2001571. doi: 10.1002/adma.202001571. Epub 2020 Jul 9.
Creating colloids of liquid metal with tailored dimensions has been of technical significance in nano-electronics while a challenge remains for generating supranano (<10 nm) liquid metal to unravel the mystery of their unconventional functionalities. Present study pioneers the technology of pulsed laser irradiation in liquid from a solid target to liquid, and yields liquid ternary nano-alloys that are laborious to obtain via wet-chemistry synthesis. Herein, the significant role of the supranano liquid metal on mediating the electrons at the grain boundaries of perovskite films, which are of significance to influence the carriers recombination and hysteresis in perovskite solar cells, is revealed. Such embedding of supranano liquid metal in perovskite films leads to a cesium-based ternary perovskite solar cell with stabilized power output of 21.32% at maximum power point tracing. This study can pave a new way of synthesizing multinary supranano alloys for advanced optoelectronic applications.
制备具有定制尺寸的液态金属胶体在纳米电子学中具有重要的技术意义，然而，生成超纳米（<10 nm）液态金属以揭示其非常规功能的奥秘仍然是一项挑战。本研究开创了从固体靶到液体的脉冲激光辐照技术，并制备出了通过湿化学合成难以获得的液态三元纳米合金。在此，揭示了超纳米液态金属在介导钙钛矿薄膜晶界处电子方面的重要作用，这对于影响钙钛矿太阳能电池中的载流子复合和滞后现象具有重要意义。这种超纳米液态金属在钙钛矿薄膜中的嵌入导致了一种基于铯的三元钙钛矿太阳能电池，在最大功率点跟踪时稳定功率输出为21.32%。本研究可为先进光电子应用合成多元超纳米合金开辟一条新途径。
