A method for the preparation of composites that allow the growth of ZnO nanorod structures on the full surface of porous silicon (polished surface, pore walls, and pore bottoms) is presented. The porous silicon is obtained by electrochemical etching of P-type silicon (100). The nanorods were grown in two steps: a sol–gel method and an oil bath method. The morphology of ZnO nanorods at different concentrations of the growth solution was investigated using scanning electron microscopy. X-ray diffraction confirmed the formation of ZnO hexagonal fibrous zincite structures. UV–Vis absorption spectroscopy confirmed that the composites possess good light absorption in the broad spectral region. In the wavelength range of 300 to 400 nm, the light absorption value of the porous silicon/zinc oxide (porous Si/ZnO) nanorods was increased by ~25% compared to that of the porous Si/ZnO films. The photoluminescence spectra confirmed the luminescence performance of the composites. Finally, the optical properties of the composites were further verified by simulation calculations.

中文翻译：

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溶胶-凝胶法和油浴法在多孔硅全表面生长 ZnO 纳米棒及其光学性质

提出了一种制备复合材料的方法，该复合材料允许 ZnO 纳米棒结构在多孔硅的整个表面（抛光表面、孔壁和孔底）上生长。多孔硅是通过电化学蚀刻P型硅(100)得到的。纳米棒的生长分两步进行：溶胶-凝胶法和油浴法。使用扫描电子显微镜研究了不同浓度生长溶液中 ZnO 纳米棒的形貌。X 射线衍射证实了 ZnO 六方纤维状锌矿结构的形成。紫外-可见吸收光谱证实复合材料在宽光谱区域具有良好的光吸收。在 300 至 400 nm 的波长范围内，与多孔 Si/ZnO 薄膜相比，多孔硅/氧化锌（多孔 Si/ZnO）纳米棒的光吸收值增加了约 25%。光致发光光谱证实了复合材料的发光性能。最后，通过仿真计算进一步验证了复合材料的光学性能。