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按不同比例混合CdTe和CdSe两种化合物,利用真空蒸发法在玻璃衬底上制备了CdSex Te1-x三元化合物薄膜,分别利用XRD、SEM、EDX、XPS、紫外-可见分光光度计对薄膜的物相结构、表面形貌、元素组成以及光学性能进行了测试,分析了x值和热处理对薄膜的影响。测试结果表明,薄膜均为立方闪锌矿结构的CdSex Te1-x三元化合物,沿(111)晶面择优生长,晶格常数与x呈线性递减关系;随x值增加薄膜的光学带隙逐渐减小,x=0.57时减小到最小值1.41 eV,然后又增大;升高热处理温度,可以改善薄膜的结晶程度,增加对光的吸收范围,减小光学带隙。
The CdTe and CdSe compounds were mixed in different proportions and the CdSex Te1-x ternary films were prepared on the glass substrate by vacuum evaporation. The films were characterized by XRD, SEM, EDX, XPS and UV-visible spectrophotometer Phase structure, surface morphology, elemental composition and optical properties were tested. The effects of x value and heat treatment on the film were analyzed. The results show that the films are all cubic sphalerite CdSex Te1-x ternary compound, which preferentially grows along the (111) crystal plane, and the lattice constant decreases linearly with x. With the increase of x value, the optical band gap of the film gradually increases Decreases to 1.41 eV when x = 0.57, and then increases again. Increasing the heat treatment temperature can improve the crystallinity of the film, increase the absorption range of light, and reduce the optical band gap.