Abstract

The aim of this study is to investigate the optical properties of thin films of MPS-encapsulated CdS quantum dots (QDs) and SiO₂/MPS-encapsulated CdS QDs mixture. For this purpose, SiO₂ sol and colloidal MPS-encapsulated CdS QDs were mixed and then deposited on a glass substrate by spin coating. Also, the spin coating method was used to deposit the colloid-produced MPS-encapsulated CdS QDs and in this way the QDs were self-assembled onto the glass substrate. The films were heat treated at 150°C under N₂ atmosphere. The optical properties of the films were characterized by UV-Vis absorption spectrophotometer and NKD spectrophotometer measurements. The refractive index and thickness of the films were calculated by fitting the measured data in a Drude–Lorentz model. The refractive index values were found 1.90 and 1.51 for the thin films of the MPS-encapsulated CdS QDs and SiO₂/QDs mixtures, respectively. According to this result, the refractive index value of the SiO₂/CdS QDs mixture thin film is close to the glass substrate and such films may be a good candidate for planar luminous solar concentrators.

中文翻译：

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MPS封装的CdS量子点与SiO 2 / MPS封装的CdS量子点混合物的薄膜的光学性能比较

摘要

这项研究的目的是研究MPS封装的CdS量子点（QDs）和SiO ₂ / MPS封装的CdS QDs混合物的薄膜的光学性质。为此，将SiO ₂溶胶和胶体MPS封装的CdS QD混合，然后通过旋涂将其沉积在玻璃基板上。另外，旋涂法用于沉积胶体生产的MPS封装的CdS QD，并以此方式将QD自组装到玻璃基板上。将膜在N ₂下在150°C热处理大气层。通过UV-Vis吸收分光光度计和NKD分光光度计测量来表征膜的光学性质。通过将测量数据拟合到Drude-Lorentz模型中，可以计算薄膜的折射率和厚度。发现MPS封装的CdS QD和SiO ₂ / QDs混合物的薄膜的折射率分别为1.90和1.51 。根据该结果，SiO ₂ / CdS QDs混合薄膜的折射率值接近玻璃基板，并且这种膜对于平面发光太阳能聚光器而言可能是很好的候选者。