Emission of Low-Dimensional Structures Formed by Femtosecond Laser Interaction with Semiconductor

Rongtao, 张荣涛 Zhang; Li, 许丽 Xu; Keyue, 吴克跃 Wu

doi:10.3788/aos20092903.0743

Cited by 1 publication

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“…Surface state and quantum confinement models were proposed. 5,6 Such micro-structure like porous silicon is usually prepared by electrochemical and photochemical etching methods. The corrosive effect of hydrofluoric acid generated numerous defects that affected the luminescent efficiency of the micro-structured silicon.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence of silicon nanoparticles prepared by nanosecond pulsed laser

Liu

Sui

et al. 2014

AIP Advances

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A pulsed laser fabrication method is used to prepare fluorescent microstructures on silicon substrates in this paper. A 355 nm nanosecond pulsed laser micromachining system was designed, and the performance was verified and optimized. Fluorescence microscopy was used to analyze the photoluminescence of the microstructures which were formed using the pulsed laser processing technique. Photoluminescence spectra of the microstructure reveal a peak emission around 500 nm, from 370 nm laser irradiation. The light intensity also shows an exponential decay with irradiation time, which is similar to attenuation processes seen in porous silicon. The surface morphology and chemical composition of the microstructure in the fabricated region was also analyzed with multifunction scanning electron microscopy. Spherical particles are produced with diameters around 100 nm. The structure is compared with porous silicon. It is likely that these nanoparticles act as luminescence recombination centers on the silicon surface. The small diameter of the particles modifies the band gap of silicon by quantum confinement effects. Electron-hole pairs recombine and the fluorescence emission shifts into the visible range. The chemical elements of the processed region are also changed during the interaction between laser and silicon. Oxidation and carbonization play an important role in the enhancement of fluorescence emission.

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Section: Introductionmentioning

confidence: 99%