研究目的
Investigating the effects of CdTe thickness on CdTe grain morphology, crystal orientation, and cell efficiency in CdTe/CdS thin-film solar cells using a combinatorial pulsed laser deposition system.
研究成果
The combinatorial PLD method provides an efficient approach for exploring device structures and optimizing CdTe/CdS solar cells. The thinnest CdTe layer (0.75 ??m) achieved the best power conversion efficiency (5.3%), highlighting the importance of grain size/morphology relative to CdTe thickness. This method can be extended to optimize other device parameters and explore more complex cell structures.
研究不足
The study is limited to the effects of CdTe thickness and postprocessing conditions on device performance. Further optimization of other PLD and CdTe/CdS solar cell parameters is needed for comprehensive device optimization.
1：Experimental Design and Method Selection:
A combinatorial pulsed laser deposition (cPLD) system was developed by integrating a computer-controlled scanning sample stage to vary the thickness of the CdTe absorber layer across a single sample.
2：Sample Selection and Data Sources:
CdTe/CdS thin-film solar cells with varying CdTe thicknesses (
3：5, 25, 0, and 75 ??m) were fabricated on the same substrate. List of Experimental Equipment and Materials:
The PLD system consisted of a 248 nm KrF excimer laser, CdS and CdTe targets (
4：99% purity), and TEC15 sodalime glass substrates. Experimental Procedures and Operational Workflow:
The CdS window layer was deposited at 200°C, followed by the CdTe absorber layer at varying thicknesses. Post-deposition annealing and CdCl2 treatment were performed to optimize the microstructure and crystallinity.
5：Data Analysis Methods:
AFM, Raman spectroscopy, J-V characterization, and EQE measurements were used to analyze the physical properties and performance of the solar cells.
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