Abstract
Inspired from the geological processes, this study develops an innovative low-concentration-ratio H2 reduction method to reduce the stoichiometric Au-CuS nanoparticles to produce completely reduced stoichiometric Cu2S with“invisible” Au achieved for single-atom enhancement. A stable Au-Cu1.97S/Cu2S micro/nano-composite is then formed by spontaneous oxidation. From this composite, in combination with the biomimetic technology, an omnidirectional photoabsorption and thermoregulated Au-Cu1.97S/Cu2S-C-T_FW film is designed and fabricated as a novel photothermal-assisted and temperature-autoregulated photodetector for broadband and low-angle-dependent photodetection that exhibits excellent performance with high responsivity (26.37 mA/W), detectivity (1.25×108 Jones) and good stability, which makes it very competitive among current high-performance photodetectors with effective areas within a square-millimeter scale. Au single-atoms exhibit significantly enhanced photodetection (1000 times). This study offers a new concept for improving the stability and the photoelectric properties of copper chalcogenides. Moreover, it opens up a new avenue towards enhancing the performance of optoelectronic and photovoltaic devices using single metal atoms and thermal-assisted, anti-overheating temperature-autoregulation.
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