研究目的
To study the effect of annealing temperature on CdTe heterojunction solar cells using thermal evaporation technique in vacuum, focusing on the expansion parameter and the band gap energy of CdTe thin film in solar cells.
研究成果
The study demonstrated that annealing temperature significantly affects the efficiency of CdTe solar cells, with efficiencies ranging from 6.4% to 10.8%. The band gap energy of CdTe thin films was found to increase with annealing temperature, indicating potential for optimizing solar cell performance through controlled annealing processes.
研究不足
The study is limited to the effects of annealing temperatures of 200°C and 400°C on CdTe thin films. The experimental setup and materials may not cover all possible variations in deposition conditions or substrate types.
1：Experimental Design and Method Selection:
The study employed thermal evaporation technique in vacuum for depositing CdTe thin films on silicon and glass substrates. The effect of annealing temperature (200°C and 400°C) on the films was investigated.
2：Sample Selection and Data Sources:
Silicon wafers and glass slides were used as substrates. The glass slides were cleaned and etched with HF 10% to remove native oxide coating.
3：List of Experimental Equipment and Materials:
A coating unit for thermal evaporation in vacuum, molybdenum boat for evaporation, and substrates (silicon wafers and glass slides).
4：Experimental Procedures and Operational Workflow:
CdTe was deposited by thermal evaporation at a vacuum of 1.5×10^-5 Torr. The substrates were placed 18 cm above the source. The films were annealed at different temperatures and analyzed for structural, topographical, and optical properties.
5：5×10^-5 Torr. The substrates were placed 18 cm above the source. The films were annealed at different temperatures and analyzed for structural, topographical, and optical properties.
Data Analysis Methods:
5. Data Analysis Methods: The crystallite size was determined using Debye-Scherrer’s relation. The optical energy gap was calculated from transmission spectra.
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