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Dual-source Co-evaporation of Low-bandgap FA <sub/>1-x</sub> Cs <sub/>x</sub> Sn <sub/>1-y</sub> Pb <sub/>y</sub> I <sub/>3</sub> Perovskites for Photovoltaics
摘要： Perovskite halides are well-suited to monolithic multijunction photovoltaics, promising low cost solar-to-electrical power conversion. Critical to all-perovskite multijunction fabrication is the deposition of a low-bandgap absorber without damaging other device layers. Vapour deposition is thus an attractive method, obviating the need for optically lossy protective interlayers, but is challenging for multi-component perovskites. Here, we demonstrate a method to dual-source co-evaporate low-bandgap perovskite films and devices. We used mixtures formed by melting of metal halides as a single-crucible source of Cs, Pb, and Sn cations. Surprisingly, when this melt was co-evaporated with formamidinium iodide (FAI), uniform and dense perovskite films in the family FA1-xCsxSn1-yPbyI3 were formed. Inclusion of SnF2 in the melt helped to regulate the perovskite’s optoelectronic quality leading to a steady-state power conversion efficiency of ~10% in a solar cell. This represents a new processing paradigm for evaporated perovskite alloys, which is an important step towards all-perovskite multijunction photovoltaics.
关键词： power conversion efficiency,perovskite halides,low-bandgap absorber,SnF2,vapour deposition,formamidinium iodide,multijunction photovoltaics
更新于2025-09-16 10:30:52
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Tandems in the thick of it
摘要： Two-terminal all-perovskite tandem structures are promising as low-cost yet highly efficient solar cells, but their development is limited by the poor quality of the low bandgap absorber layer. Now, a processing method has been shown to enable the production of uniform, thick tin–lead perovskite layers, which translate into improved photovoltaic parameters.
关键词： perovskite photovoltaics,low bandgap absorber,power conversion efficiency,tin–lead perovskite,tandem solar cells
更新于2025-09-09 09:28:46