研究目的
Investigating the effects of background gases and pressure on the plasma formation and properties of Al-doped ZnO thin films deposited by pulsed laser deposition at room temperature.
研究成果
The study concludes that the background gas and pressure significantly affect the plasma formation and properties of Al-doped ZnO thin films deposited by pulsed laser deposition at room temperature. The emission intensity and ion velocity are influenced by the type of gas and pressure. The deposited films exhibit different morphologies and optical properties depending on the type of gas and pressure.
研究不足
The study is limited to the effects of background gases (O2, He, Ar) and pressure on the plasma formation and properties of Al-doped ZnO thin films deposited by pulsed laser deposition at room temperature. The study does not explore the effects of other gases or higher temperatures.
1:Experimental Design and Method Selection:
A Nd-YAG laser (third harmonic 355 nm,
2:7 ns) was used for ablation of Al-doped ZnO target. The deposition chamber was evacuated to a base pressure of 10?3 Pa, and then introduced with different background gas (O2 or He or Ar) to obtain a partial pressure (6 Pa–3 Pa) for deposition. Sample Selection and Data Sources:
Silicon (p-Si 100) and glass (Corning #26003) substrate were ultrasonically cleaned prior to use. They were placed
3:5 cm from the target. List of Experimental Equipment and Materials:
Nd-YAG laser (EKSPLA, NL301), Al-doped ZnO target (Kurt J. Lesker,
4:99% purity, 98% ZnO + 2wt% Al2O3), spectrometer (Ocean optics, S2000), atomic force microscopy (AFM) (Nanosurf), scanning electron microscope (SEM) (Hitachi, s1510, 15 kV), X-ray diffraction (XRD) (PANalytical, Empyrean). Experimental Procedures and Operational Workflow:
Deposition was carried out at room temperature for 45 min with at a repetition rate of 10 Hz. The laser beam was focused on the target at 45° with the dimension of ~1 mm x
5:8 mm. The laser fluence was kept at 2 J/cm2 for all deposition. Data Analysis Methods:
The plasma plume was measured by using time-integrated, optical emission spectroscopy and ion time of flight (TOF) measurements. The properties of the deposited ZnO thin films were characterized by UV–vis–NIR spectrophotometer, AFM, SEM, and XRD.
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