【摘要】 采用同步辐射光电子能谱、原子力显微镜及场发射扫描电镜等技术研究了3 nm Fe薄膜在极性ZnO(000)表面的沉积和退火过程中的界面化学过程.结果表明:在低覆盖度下,Fe价层电子与极性ZnO表面间存在较强电子迁移作用;当覆盖度超过1个原子层后,Fe与ZnO的反应在热力学上被禁阻;室温下Fe在表面形成直径约为20 nm的岛状结构,通过对样品退火处理,发现Fe-ZnO在600℃时开始发生强烈作用,形成Fe的氧化态峰,并于800℃完全转换为Fe2+,随着退火温度的继续提高,Fe有继续向Fe3+转变的趋势,并在ZnO表面形成直径120 nm左右的氧化物岛结构.更多还原

【Abstract】 Synchrotron radiation photoemission spectroscopy(SR-PES),atom force microscopy(AFM) and field emission scanning electron microscope were used to study the chemical reactions between iron and O-terminated polar ZnO(000) surface during the interface formation and annealing process.For iron coverages below 1 ML,Fe2+ species are formed at Fe/ZnO interface,followed by the formation of a metallic iron overlayer.The bonding of Fe at very low coverages occurs by electron transfer from Fe to surface oxygen atoms.The thermal stability of the interface was also studied from room temperature to 900 ℃.The results that the iron is oxidized into Fe2+ species at 600 ℃,and it tends to be oxidized into Fe3+ species at even higher temperatures.The room temperature deposited 3 nm Fe deposition forms 3D islands of about 20 nm in diameter on the surface.And it changes rapidly to 120 nm in diameter as the annealing temperature increases to 900 ℃.更多还原