Investigation of CH3NH3SnI3 Thin layers and its use in solar cells
Keywords:
Evaporation, Solar Cells, Photovoltaic, Energy Gaffe , Thin LayerAbstract
The main subject of this research is the investigation of perovskite thin layers based on tin and its use in new generation solar cells, the purpose of which is to achieve solar systems that have high performance and are more stable in addition to being non-toxic. Investigations of structural and optical parameters of SnI2 tin iodide layers showed that this substance can be used as an active substance in lead-free perovskite solar cells. For this purpose, a tin-based perovskite with CH3NH3SnI3 structure was made through a two-stage rotary-evaporation layering method in the presence of isopropanol solution, and after checking the effective parameters in layering such as heating temperature and also the temperature of the solution evaporation source, their optimal values Obtained. The results of the study of the effect of heating on its optical properties and surface morphology showed that the heating temperature in the range of 75°C to 150°C on the SnI2 thin layer has a great effect on the preferred orientation of the layers. The optimal heating temperature for this perovskite precursor was found to be close to 100°C, and at this temperature, its energy gap decreased from 1.86 eV to 1.42 eV, and it was used in the porous solar cell structure on a laboratory scale. The efficiency of the cell reaches the optimal value of 2.06%, which relatively increases the efficiency of the solar cell by 46% compared to the sample without evaporation of the solution.
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