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采用化学水浴法在玻璃衬底上制备纯的和稀土Dy掺杂的CdS薄膜,并在N2气氛中,对以上制备的薄膜进行T=350℃、t=40 min的热处理。实验结果表明,水浴温度在70℃~80℃间制备的CdS薄膜,表面致密、光滑,膜的质量最好,且为沿[111]晶向择优生长的立方闪锌矿结构。掺Dy虽未改变CdS薄膜的晶体结构,但改善了薄膜的表面形貌,使得薄膜的致密性增强、颗粒大小匀称,同时Dy的掺入增大了CdS薄膜在可见光范围内的透光率。
Pure and rare-earth Dy-doped CdS films were prepared on glass substrates by chemical bath method. The films prepared above were heat-treated at T = 350 ℃ and t = 40 min in N2 atmosphere. The experimental results show that the CdS thin films prepared at the bath temperature between 70 ℃ and 80 ℃ have the most compact and smooth surface, the best film quality and the cubic sphalerite structure preferentially grown along [111] crystal orientation. Dy did not change the crystal structure of CdS thin films, but improved the surface morphology of the thin films, resulting in the compactness of the thin films and the uniform grain size. Meanwhile, the doping of Dy increased the transmittance of CdS thin films in the visible range.