Towards 3-Terminal Perovskite/Silicon Tandem Solar Cells: Influence of Silicon Bottom Cell on Tandem Cell Fabrication
Nucleation and Atmospheric Aerosols(2023)
Abstract
bottom solar cells featuring an interdigitated back contact (IBC) based on laser processes can be integrated in highly efficient 3-Terminal perovskite/silicon tandem solar cells. While surface texturing of the Si bottom cell on the front side is essential for light trapping and thus enhanced absorption of long-wavelength light, it can hamper the conformal wet-chemical deposition of the perovskite top cell. Modification of our texture-etch allows a reduction of the pyramids size without affecting the light absorption in the Si cell. Our laser-processed double-side textured Si IBC cells reach efficiencies up to 22.6% under 1-sun illumination when using a non-optimized laser doping process. Perovskite layers deposited on these modified bottom cells cover their pyramids, which is necessary for shunt-free tandem devices. Since tandem operation requires a low-resistive electrical connection of the subcells, passivation properties of wet-processed SnO2 and TiO2 layers on Si are evaluated. To achieve higher tandem cell efficiencies, IBC solar cells with suitable passivating front contact layers need to be developed.
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Key words
solar cells,perovskite/silicon tandem,tandem cells fabrication
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