蒸发条件对碘化铅多晶薄膜结构的影响

采用真空蒸发法在普通玻璃上制备了PbI₂多晶薄膜.研究了蒸发速率、蒸发源与衬底距离、薄膜厚度以及衬底温度等实验条件对所制备PbI₂多晶薄膜结构的影响.利用X射线衍射仪和扫描电子显微镜对样品进行了测试.结果表明，在衬底温度为室温时得到(001)择优取向的多晶PbI₂薄膜，即沿c轴垂直衬底方向取向生长的薄膜.当衬底温度升高时，薄膜的择优取向逐渐由(001)转向(003)，且晶体颗粒变大.薄膜中的内应力随衬底温度的升高而降低.

Influence of evaporation conditions on the structure of the polycrystalline lead iodide films

Polycrystalline lead iodide (PbI₂) thin films have been prepared on glass substrates by vacuum evaporation. The influences of evaporating rate，the distance between the resources and the substrates，the thickness of the films and the temperature of the substrate on the structure of the film were studied. The structures of the films were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results shows that the films were (001) preferentially grown，when the substrate was at room temperature. At higher substrate temperature，the films were mostly (003) preferentially grown and the size of the grains were larger. The internal stress became smaller when the substrate temperature became higher.