Laser‐Generated Supranano Liquid Metal as Efficient Electron Mediator in Hybrid Perovskite Solar Cells

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Abstract
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.
Funding Information
  • National Natural Science Foundation of China (51911530212, 61805201, 51872240, 51972272, 51672225, 11811530635)
  • China Postdoctoral Science Foundation (2019M653731)
  • Fundamental Research Funds for the Central Universities (3102019JC005, 3102019ghxm004)
  • State Key Laboratory of Solidification Processing (2019‐QZ‐03)
  • Australian Research Council (DP160102627, DP170101467, FT180100585)
  • Joint Research Centre
  • Russian Science Foundation (19‐79‐30091)

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