研究目的
Investigating the effect of copper doping on the optical, morphological, structural, and photoluminescence properties of cadmium sulfide thin films deposited by hydrothermal assisted chemical bath deposition method.
研究成果
Copper-doped and undoped CdS thin films were successfully deposited using the hydrothermal assisted CBD method. Doping with Cu led to a reduction in bandgap energy from 2.50 eV to 2.21 eV, an increase in crystallite size, a morphological change from spherical to disc-like structures, and a red shift in photoluminescence peaks. No significant change in crystal structure was observed, but FTIR showed slight changes in vibrational modes. These findings indicate that Cu doping enhances the optical properties of CdS films, making them suitable for optoelectronic applications.
研究不足
The study does not mention specific technical constraints or optimization areas, but potential limitations could include the use of a single doping concentration (2% Cu), lack of electrical property measurements, and the need for further scalability and application testing in devices.
1：Experimental Design and Method Selection:
The study used a hydrothermal assisted chemical bath deposition (HACBD) method to deposit undoped and copper-doped CdS thin films on FTO glass substrates. This method was chosen for its simplicity, cost-effectiveness, and ability to produce uniform films.
2：Sample Selection and Data Sources:
Commercially available FTO glass substrates were used. Chemicals included cadmium nitrate (Cd(NO3)2), copper nitrate (Cu(NO3)2), and thiourea (CH4N2S), all of analytical grade.
3：List of Experimental Equipment and Materials:
Equipment included an autoclave, a desktop constant temperature drying oven (WHL-25A), UV-Vis spectrophotometer (Perkin Elmer-750 nm), X-ray diffractometer (XRD), scanning electron microscope (SEM), Fourier transform infrared spectrometer (FTIR), and photoluminescence spectrometer (In-via confocal Microscope-Renishaw). Materials were FTO glass, Cd(NO3)2, Cu(NO3)2, and CH4N2S.
4：2S. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Substrates were cleaned with detergent, rinsed with water, soaked in acetone, ultrasonicated, and dried. Solutions of
5：5 M Cd(NO3)2 and 5 M CH4N2S were prepared for pure CdS, with 2% 5 M Cu(NO3)2 added for doping. Solutions were poured into a Teflon autoclave with suspended substrates, sealed, and heated at 140°C for 2 hours. After deposition, substrates were dried. Data Analysis Methods:
Optical bandgap was determined using Tauc plots from UV-Vis data. Crystallite size was calculated using the Debye-Scherrer formula from XRD data. Morphology was analyzed via SEM images, chemical bonds via FTIR spectra, and luminescence via PL spectra.
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