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Green Solution Bathing Process for Efficient Large-area Planar Perovskite Solar Cells
摘要： Perovskite solar cells (PSCs) towards practical application relies on high efficiency, long lifetime, low toxicity and device upscaling. To realize large-area PSCs, a green solution bathing strategy is delivered to prepare high-performance PSCs. By utilizing 2-pentanol as a green solvent and formamidinium chloride (FACl) as a solute in the green solution bathing, perovskite films with enlarged grain sizes, improved crystallinity and alleviated defect state density were obtained, resulting in the enhancement in the power conversion efficiency of PSCs. Coupled with 2-pentanol and FACl, a champion efficiency of 21.03% for small cells (0.103 cm2) and over 18% for large size (1.00 cm2) were obtained based on the GSB process, which can outperform its counterpart made from commonly-used anti-solvent dropping method. In addition, a large perovskite film (5 cm × 5 cm) with obvious mirror effect was successfully prepared. Our innovative approach paves the way to promote device upscaling of PSCs via environment-friendly technique.
关键词： 2-pentanol,green solvent,large-area,solution bathing,perovskite solar cells,FACl
更新于2025-09-23 15:21:01
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Bulk recrystallization for efficient mixed-cation mixed-halide perovskite solar cells
摘要： Today, the use of mixed-cation lead mixed-halide perovskite with a slight excess of lead iodide (PbI2) demonstrates the highest device performances in the literature. However, the presence of excess PbI2 in the film poses long-term stability concerns. Here, we propose a facile bulk recrystallization process by applying formadinium chloride (FACl) on perovskite to remove excess PbI2 in the formed crystal. We are able to demonstrate bulk recrystallization, proved and observed by the Grazing incidence XRD to analyze the crystal structure as a function of depth profiling. The reconstructed crystal displays improved optoelectronic qualities with reduced interfacial recombination as well as enhanced device stability. When measured under AM 1.5G spectral conditions the optimized champion device reached a maximum power conversion efficiency (PCE) of 20.2%.
关键词： bulk recrystallization,optoelectronic qualities,FACl,perovskite solar cells,PbI2,device stability
更新于2025-09-16 10:30:52