Abstract
Tunnel oxide passivated contact (TOPCon) solar cells are key emerging devices in the commercial silicon-solar-cell sector. It is essential to have a suitable bottom cell in perovskite/silicon tandem solar cells for commercial use, given that good candidates boost efficiency through increased voltage. This is due to low recombination loss through the use of polysilicon and tunneling oxides. Here, a thin amorphous silicon layer is proposed to reduce parasitic absorption in the near-infrared region (NIR) in TOPCon solar cells, when used as the bottom cell of a tandem solar-cell system. Lifetime measurements and optical microscopy (OM) revealed that modifying both the timing and temperature of the annealing step to crystalize amorphous silicon to polysilicon can improve solar cell performance. For tandem cell applications, absorption in the NIR was compared using a semitransparent perovskite cell as a filter. Taken together, we confirmed the positive results of thin poly-Si, and expect that this will improve the application of perovskite/silicon tandem solar cells.
Highlights
Perovskite/silicon tandem solar cells represent an attractive technology for commercial use due to advantages of perovskite, such as wide bandgap tunability, relatively simple design, and low cost
The feasibility of perovskite/silicon tandem solar cells was confirmed by measuring the external quantum efficiency (EQE) of the bottom cell with light transmitted through the perovskite top cell
The perovskite precursor solution (1.43 M Formamidinium iodide (FAI), 0.08 M methylammonium bromide (MABr), 0.50 M Methylammonium chloride (MACl), 1.56 M PbI2, and 0.08 M PbBr2 in 8:1 DMF:dimethyl sulfoxide (DMSO) by volume) was spin coated at 1000 rpm for 10 s and 5000 rpm for 40 s
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. As crystalline silicon, single-junction solar cells are approaching the 29.4% limit of power convention efficiency (PCE) [2], many researchers and companies are beginning to develop silicon-based tandem devices as next-generation commercial solar cells to achieve better energy yield across the solar spectrum, and to reach an improved theoretical efficiency potential [3,4]. Among these emerging devices, perovskite/silicon tandem solar cells represent an attractive technology for commercial use due to advantages of perovskite, such as wide bandgap tunability, relatively simple design, and low cost. The feasibility of perovskite/silicon tandem solar cells was confirmed by measuring the external quantum efficiency (EQE) of the bottom cell with light transmitted through the perovskite top cell
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