Preparation And Performance Research Of Bionic Micro-nano Copper Sulfide Photoelectric Detection Materials

Metals,semiconductors,and metal/semiconductor functional materials are widely used in photovoltaics,catalysis,and biomedicine due to their plasmon characteristics,great optical and photoelectric characteristics.Metal/semiconductor functional materials may even show complementary or synergistic effects of properties and functions between different components,thus gradually become widely studied.With the development of nanotechnology,research on biomaterials,bio-inspired materials and biomimetic materials has been extended to the micrometer and nanometer levels,which has promoted a major breakthrough in the design of advanced functional materials.The precious metal Au with high chemical stability,oxidation resistance,good biocompatibility and plasmon characteristics has become an important single component material.The copper chalcogenide Cu_xS has attracted great attention due to its advantages of non-toxic,environmental friendly,recyclable and adjustable band gap.In this study,nanotechnology and bionic technology were combined,regarding the foreswing of Troides Helena?T?FW?with three-dimensional complex and multi-level fine structure in nature as the template,the low-angle-dependent optical characteristics,light-to-heat conversion characteristics,and self-temperature-control characteristics of the Au-Cu S-T?FW and the Au-Cu_1.97S/Cu₂S-C-T?FW were studied,photodetectors with low angle-dependence that can achieve broadband light detection and self-temperature-control characteristics were prepared.Combined with the FDTD simulation and Joule's law,the physical mechanism of the metal/semiconductor functional material coupling with the hierarchical antireflection light absorption structure of T?FW that realized broadband light absorption and light-to-heat conversion was studied.Combined with the First principles calculation methods,the physical mechanism of Au-Cu-S solid solution that enhanced the light absorption of photodetectors was explored.The main research contents are as follows:1.The characteristic that traditional electronic and optoelectronic devices had a strong dependence on the incident light was solved by using the hierarchical antireflection light absorption structure of T?FW as the template.The photodetector we prepared can achieve efficient light absorption when the incident angle is 0°?50°.2.The overheating phenomenon of traditional electronic and optoelectronic devices during use that led to limited applications was solved by using the temperature auto-regulation of T?FW.The photodetector we prepared have great light absorption characteristics at 10°C,20°C and 38°C.The responsivity?R_??and detectivity?D*?of the photodetector demonstrates a steadily increase when the temperature is increased.3.The problem that surface of Cu₂S nanomaterial was easily oxidized and mismatch between traditional protective layer and Cu₂S nanomaterials was solved by using Cu_1.97S formed by natural oxidation.The more stable Cu_1.97S acts as a protective layer.