研究目的
Investigating the hydrazine effect on the growth, structural and optical characteristics of the ZnS thin films on both the soda-lime glass substrate and the CIGS absorber layer as a function of its relative content rc with respect to ammonia as well as the deposition time td in the chemical bath deposition.
研究成果
The hydrazine plays a key role in the deposition of ZnS to expedite the in-plane grain growth by 6 times accompanied both with a reduction of in-plane grain size and a denser packing density. The best solar cell performance was obtained from the ZnS buffer grown at rc = 0.28 and td = 30 min.
研究不足
The study is limited by the specific conditions of the chemical bath deposition process, including the concentration of hydrazine and ammonia, deposition time, and temperature. The formation of cracks in the ZnS layer at longer deposition times is also a limitation.
1：Experimental Design and Method Selection:
The ZnS thin films were synthesized on soda-lime glass (SLG) substrates using a standard CBD method. The effect of hydrazine as a secondary complexing agent was investigated by varying its relative molar concentration with respect to ammonia and the deposition time.
2：Sample Selection and Data Sources:
The substrates were cleaned ultrasonically in sequences with acetone, ethanol, and deionized water. The bath temperature was maintained at 80 °C with constant stirring.
3：List of Experimental Equipment and Materials:
Zinc sulfate heptahydrate and thiourea were used as precursors, with ammonia and hydrazine as complexing agents. Equipment included FE-SEM for surface morphology, XRD for crystallographic analysis, and UV-Vis-NIR spectrophotometer for optical transmittance.
4：Experimental Procedures and Operational Workflow:
The substrates were inserted into the reaction mixture solution for various time intervals. After deposition, the coated slides were rinsed and dried.
5：Data Analysis Methods:
The crystallographic analysis was done by XRD, surface morphology by FE-SEM, and optical transmittance by UV-Vis-NIR spectrophotometer.
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