反应前驱物中n(S)∶n(Cd)对CdS薄膜结构及发光特性的影响

采用化学水浴以CdCl2·H2O、CS( NH2)2、NH4Cl、NH3·H2O和去离子水作为反应前驱物制备CdS纳米晶薄膜.采用扫描电镜( SEM)、X射线衍射(XRD)、透射光谱和稳态荧光光谱,研究了反应前驱物中不同的n(S)∶n(Cd)对所制备的CdS薄膜的形貌、结构和光学性能的影响.结果表明:反应前驱物中n(S...

Influence of n(S):n(Cd) in Precursors on The Structural and Luminescent Properties of CdS Films

CdS thin film was prepared by chemical bath deposition at different n(S) ∶n(Cd) using the precursors of CdCl₂·H₂O, CS(NH₂)₂,NH₄Cl,NH₃·H₂O and deionized water. The surface morphology, structure and optical properties of all the samples have been analyzed by scanning electron microscopy, X-ray diffraction,transmission and photoluminescence (PL) spectra. The results indicated that spherical particle like morphology and cubic structure CdS thin films were obtained at n(S) ∶n(Cd) greater than or equal 3 ∶1.All CdS thin films with a close stoichiomerty S/Cd=0.91 were Cd-rich belong to n-type semiconductor.The absorption edge of CdS films was about 450 nm, the optical transmittance was more than 70% in the wavelength range from 510 to 2 500 nm.Intensity of the photoluminescence peak at 500 nm is stronger.