The thesis focuses on the analysis of the performance of perovskite solar cells with different perovskite layer thicknesses. Considering the EU's renewable energy goals and the increasing importance of solar energy, the research aims to optimize the performance of perovskite solar cells whose efficiency can significantly contribute to achieving these goals.
In the thesis, we precisely described the procedures for preparing solar cells, including cleaning glass substrates, measuring and preparing chemicals, and applying layers, as well as the characterization of the manufactured solar cells. Special attention was given to the preparation of solutions and the spin coating process of applying the perovskite layers in order to achieve thinner layers. The remaining procedures for the deposition of C60, BCP, and copper layers in the evaporator are also described. The measurements included current-voltage characteristics (J-V), external quantum efficiency (EQE), reflection, transmission, and light absorption, as well as determining the maximum power point (MPPT).
In the experimental part, we focused on comparing perovskite cells of different thicknesses. We found that reducing the thickness of the perovskite layer also decreases light absorption and cell efficiency. Thinner cells have lower external quantum efficiency (EQE) and a higher probability of charge carrier recombination, which affects the reduction of short-circuit current density, open-circuit voltage, and fill factor. Measurements of reflection, transmission, and absorption confirm that thinner layers allow for greater light transmission and lower absorption, but, as a result, the cells are less efficient.
The thesis contributes to a better understanding of the impact of perovskite layer thickness on solar cell efficiency. We found a thicker perovskite layer to be optimal, but it requires more material, so that it is crucial to achieve a balance between cell efficiency and chemical consumption. The findings can contribute to further development and improvements in photovoltaics and the broader use of solar energy.
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