As of 2026-09-11 · the last 10 years
Caesium’s research intensity currently sits at about 56% of its all-time peak, a level that has remained flat over the last decade despite the element’s all-time high occurring in 1968.
Research intensity ran from about 52% of the element's own all-time peak in 2016 to about 56% in 2026 — flat overall, with some movement in between, and the all-time peak (1968) lies before this window. Over the same span its share of research attention across all elements rose. Among the 118 elements, caesium has a mid-sized research literature.
The number of papers involving the element rose from about 2,203 in 2016 to about 4,980 in 2025 (2.26x). That matches the growth of the literature as a whole over the same years: the general tide of scientific output, not a surge specific to the element.
The bulk of caesium’s recent research belongs to the community of All-Inorganic Perovskite Solar Cells and Thin Films. These papers focus on the synthesis and interface engineering of all-inorganic cesium lead bromide perovskites for photovoltaic applications, often utilizing distinctive materials like CsPbBr3 nanocrystals and perovskite quantum structures. Caesium is a minor presence in this much larger community, accounting for about 10% of its papers, yet it represents the largest share of caesium-specific work at about 69% of the element's recent research. This share is declining from about 74% in the previous period. A key anchor for this work is a 2025 paper in Nature Nanotechnology on homogeneous 2D/3D heterostructured tin halide perovskite photovoltaics, cited over 140 times, alongside a highly cited 2019 study in Science on efficient, stable solar cells, cited over 1,200 times.
A second distinct community tracks Caesium Transport in Fukushima Soil Erosion. This work monitors caesium redistribution via soil erosion and loss in the Upper Oka basin following the Daiichi nuclear accident, with distinctive phrases including "soil erosion" and "Fukushima Daiichi." Caesium is a minor presence in this broader nuclear fuel cycle community, appearing in about 2% of its papers, but it constitutes about 6% of caesium's recent research. This share has remained steady. Notable work includes a 2023 paper in Journal of Hazardous Materials on chitosan-minerals-based composites for adsorption of caesium, cited about 59 times.
Finally, a small but stable community focuses on Caesium Fountain Clocks and Ion Source Development. These papers address caesium atomic fountain clocks, primary frequency standards, and the sputter ion sources required to produce the atoms, often involving "caesium atoms" and "neural network" optimizations. Caesium is a minor presence in this atomic clock community, found in about 2% of its papers, yet it makes up about 2% of caesium's recent research, a share that has held steady. A significant contribution here is a 2021 paper in Physical Review Letters on improved limits for violations of local position invariance, cited over 200 times.
Overall, the composition of caesium research is shifting slightly away from perovskite solar cells toward other emerging areas, though the perovskite community remains the dominant force. For a deeper look at the element's current standing, see the Last 12 Months and Executive Brief reports.
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