CAJ | 학술논문

采用热蒸发法在ZnO缓冲层覆盖着Si衬底上合成了2D叶状的Zn晶枝结构,Zn的晶枝长度约为几十微米,厚度约为200 nm,随后Zn晶枝在O2的气氛下热处理,在晶枝表面获得纤细、均匀的ZnO纳米线.晶枝按照无催化、自组装、汽相生长模式生长,晶枝最快生长方向是沿着载气气流的方向释放凝固潜热,XRD分析结果结果显示了Zn纳米线具有六角纤锌矿结构,Zn/ZnO的发光谱显示,在380 nm处有一弱的UV近带边发射和中心在505 nm处的强绿光发射,绿光发射归因于施主/受主对之间的辐射跃迁.
채용열증발법재ZnO완충층복개착Si츤저상합성료2D협상적Zn정지결구,Zn적정지장도약위궤십미미,후도약위200 nm,수후Zn정지재O2적기분하열처리,재정지표면획득섬세、균균적ZnO납미선.정지안조무최화、자조장、기상생장모식생장,정지최쾌생장방향시연착재기기류적방향석방응고잠열,XRD분석결과결과현시료Zn납미선구유륙각섬자광결구,Zn/ZnO적발광보현시,재380 nm처유일약적UV근대변발사화중심재505 nm처적강록광발사,록광발사귀인우시주/수주대지간적복사약천.
The novel 2D leaf-like zinc dendritic structures have been synthesized on ZnO buffer layer coated onto Si substrates. The growth process is described as free-catalyst,self-assembly and vapor-solid growth mode. The length of the Zn dendrite is about dozens of micrometers and its thickness is about 200 nm. The fastest growth direction of the dendrites is along the carrier gases downstream direction to release the latent heat of solidification. After the zinc dendrites have the thermal process in oxygen ambient,the slim and uniform ZnO nanowires are grown on the surface of Zn dendrites. The results of XRD analysis indicated that the ZnO nanowires are with a hexagonal wurtzite structure. The growth mechanisms of Zn/ZnO structures were investigated. The PL spectrum of Zn/ZnO dendritic structures shown that a weak UV near-band-edge emission is at 380 nm and a strong green emission is centered at 505 nm. The green emission is attributed to radiation transition of donor-acceptor pair.