研究目的
Investigating the effects of different alkali alternatives for post-deposition treatment on ACIGS thin films for solar cells, including conventional fluoride salts and metals, to understand their interaction with ACIGS surfaces and their impact on solar cell performance.
研究成果
The study demonstrates that beneficial post-deposition treatments can be achieved using both alkali metals and their fluorides, leading to the formation of (Ag)KInSe2 or (Ag)RbInSe2 compounds and efficiencies above 18% for solar cells without antireflective coating. The voltage loss for the best cells was consistently 400 mV across different treatments.
研究不足
The deposition of alkali metal from the dispenser source is highly non-uniform, which may affect the consistency of the pdt effects across the sample. The study is limited to a specific range of bandgap energies (1.09 to 1.22 eV) for the solar cells.
1：Experimental Design and Method Selection:
The study involved the deposition of ACIGS on Mo-coated soda lime glass substrates using quadrupole mass-spectrometry feedback control at a substrate temperature of 550 °C. Post-deposition treatments (pdt) were performed in-situ with various compounds and metals (K, KF, Rb, RbF) using specific source configurations.
2：Sample Selection and Data Sources:
Samples were subjected to XPS analysis before and after an NH3 etch to simulate the wet chemical CdS process in solar cell fabrication.
3：List of Experimental Equipment and Materials:
Equipment included effusion sources for fluoride deposition and dispenser sources for alkali metal evaporation, monitored by a quartz crystal monitor.
4：Experimental Procedures and Operational Workflow:
The pdt was performed at a reduced substrate temperature of about 350°C for 10 minutes, followed by cooling to 100 °C in vacuum before analysis or further processing into solar cell devices.
5：Data Analysis Methods:
XPS was used to analyze the surface composition and the formation of compounds, with solar cell performance evaluated through EQE measurements.
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