Publications by authors named "D B Menzel"
Growth and Structure of Ultrathin Iron Silicate and Iron Germanate Films.
J Phys Chem C Nanomater Interfaces
November 2024
Article Synopsis
- The study explores the growth and structure of ultrathin iron silicate and iron germanate films on a ruthenium substrate, focusing on how temperature affects their formation.
- These two-dimensional films serve as simplified models for more complex, catalytically active structures like zeolites, which have applications as catalysts and molecular sieves.
- Researchers used advanced experimental techniques for real-time analysis and theoretical modeling to reveal that both film systems consist of a two-layer structure, with distinct compositions impacting the arrangement and properties of iron atoms within the films.
[Hemophilia A in a male cat with intermittent lameness].
Tierarztl Prax Ausg K Kleintiere Heimtiere
October 2024
A 3-month-old domestic shorthair tomcat born on a farm was unsuccessfully treated with meloxicam for alternating lameness, fever and inappetence. On presentation, there was lameness (grade 2/4) of the right forelimb with mild swelling of the soft tissue. Rectal temperature was 39.
View Article and Find Full Text PDFUnderstanding the sub-band gap luminescence in Ruddlesden-Popper 2D metal halide hybrid perovskites (2D HaPs) is essential for efficient charge injection and collection in optoelectronic devices. Still, its origins are still under debate with respect to the role of self-trapped excitons or radiative recombination via defect states. In this study, we characterized charge separation, recombination, and transport in single crystals, exfoliated layers, and polycrystalline thin films of butylammonium lead iodide (BAPbI), one of the most prominent 2D HaPs.
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- All-perovskite tandem solar cells are promising for high performance and affordability, crucial for market entry.
- Researchers developed a new triple-halide perovskite with a 1.8 eV bandgap, enhancing tandem cell performance through a special surface treatment using piperazinium iodide (PI).
- This innovation resulted in improved charge carrier properties and efficiency, leading to a tandem solar cell achieving a certified efficiency of 27.5%.
Improved stability and efficiency of two-terminal monolithic perovskite-silicon tandem solar cells will require reductions in recombination losses. By combining a triple-halide perovskite (1.68 electron volt bandgap) with a piperazinium iodide interfacial modification, we improved the band alignment, reduced nonradiative recombination losses, and enhanced charge extraction at the electron-selective contact.
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