磁控溅射ZnO薄膜生长的等离子体发射光谱研究

通过反应磁控溅射过程中的等离子体发射光谱，研究了制备ZnO薄膜的沉积温度、氧气流量比例R=O₂/(O₂+Ar)对Zn和O原子发射光谱的影响，并结合ZnO薄膜的结构和物理性能，探讨了沉积温度在ZnO薄膜生长中的作用.研究结果显示：当R≥0.75%时， Zn的溅射产额随R的增加基本呈线性下降规律.当R介于10%—50%时，氧含量的变化相对平缓，有利于ZnO薄膜生长的稳定性控制.Zn原子发射光谱强度随沉积温度的变化可以分为三个阶段.当沉积温度低于250℃时，发射光谱强 关键词： ZnO 薄膜生长 反应磁控溅射 等离子体发射光谱

Study of ZnO film growth by reactive magnetron sputtering using plasma emission spectra

Using on-line measurement of plasma emission spectra during reactive magnetron sputtering, the growth of ZnO films was studied with the variation of O₂ flow and deposition temperature, ranging from room temperature to 750℃. With the structural characterization and measurement of optical properties, we revealed the role of growth temperature and O₂ flow in the growth of ZnO film. The results showed that O₂ flow was important in determining the sputtering yield of Zn target. When the flow ratio of O₂ to Ar+O₂ (R)>0.75%, the sputtering yield of Zn decreased linearly with increasing O₂ flow. When R was in the 10%—50% range, the concentration of oxygen varied slowly, which may be useful for the control of film growth. The intensity of emission spectrum of atomic Zn at 481.3 nm varied with increasing deposition temperature T. When T<250℃, the intensity was approximately a constant. When 250℃550℃, the intensity increased sharply with increasing deposition temperature. By controlling the deposition temperature, a high-quality film with the composition close to stoichiometric ZnO was fabricated on Si(001) substrate at 750℃ and ultraviolet photoluminescence was detected at room temperature.