论文部分内容阅读
采用无催化脉冲激光沉积(PLD)方法,在InP(100)衬底上生长纳米ZnO针状结构。采用扫描电子显微镜(SEM)、X射线衍射(XRD)以及光致发光(PL)谱等对ZnO纳米针的形貌、晶体结构和光学特性表征。SEM图像观察到ZnO纳米针状结构具有一定的取向性。XRD测试在2θ=34.50°处观测到强烈的ZnO(002)衍射峰,证实ZnO纳米针具有较好的c轴择优取向。室温PL谱在379nm处观察到了较强的自由激子发射峰(半峰全宽为13.5nm),而微弱的深能级跃迁峰位于484nm,二者峰强比值为11∶1,表明生长的纳米ZnO结构具有较高的光学质量。
Nano-ZnO needle-like structures were grown on InP (100) substrates by using a non-catalytic pulse laser deposition (PLD) method. The morphology, crystal structure and optical properties of ZnO nanoneedles were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and photoluminescence (PL) spectroscopy. The SEM images show that ZnO nano-acicular structure has a certain orientation. The strong diffraction peak of ZnO (002) at 2θ = 34.50 ° was observed by XRD. It was confirmed that the ZnO nanorod had better c-axis preferred orientation. The strong free exciton emission peak (FWHM of 13.5 nm) was observed at 379 nm for the PL spectrum at room temperature, while the weak deep level transition peak was at 484 nm with a peak to peak ratio of 11: 1 The nano-ZnO structure has higher optical quality.