掺AlZnO纳米线阵列的光致发光特性研究

采用化学气相沉积方法，以金做催化剂，在Si (100)衬底上制备了掺AlZnO纳米线阵列.扫描电子显微镜(SEM)表征发现ZnO纳米线的直径在30nm左右.X射线衍射(XRD)图谱上只存在ZnO的(002)衍射峰，说明ZnO纳米线沿c轴择优取向.掺AlZnO纳米线阵列的室温光致发光(PL)谱中出现了3个带边激子发射峰：373nm，375nm，389nm.运用激子理论推算出掺AlZnO纳米线的禁带宽度为3.343eV ，束缚激子结合能为0.156eV；纯ZnO纳米线阵列PL谱中3个带边激子发射 关键词： 光致发光 化学气相沉积(CVD) 激子 ZnO纳米线阵列

Room-temperature optical properties of Al-doped ZnO nanowires array

Al-doped ZnO nanowire arrays were synthesized with Au catalysis on Si(100) substrate using the chemical vapor deposition technique. Only (002) diffraction peaks of ZnO can be found in the XRD patterns of the samples, which shows that the as-grown nanowires are highly crystalline in nature and grow along the ［001］ direction. The SEM images show that the ZnO nanowires are perpendicular to the substrate surface. Room-temperature photoluminescence (PL) measurement shows 3 near band-edge emission peaks at 373, 375 and 389nm. Analysis shows that the band gap of Al-doped ZnO nanowaires is 3.343eV and the exciton binding energy is 0.156eV. Room-temperature PL spectrum of pure ZnO nanowaires shows 3 near band-edge emission peaks at 377, 379 and 389nm. The band gap of pure ZnO nanowaires is 3.301eV and the exciton binding energy is 0.113eV, which shows that the band gap increases due to Al doping.