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Ohmann, Robin
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Topics
Publications (9/9 displayed)
- 2023Metal Halide Perovskite Surfaces with Mixed A‐Site Cations: Atomic Structure and Device Stabilitycitations
- 2018Inducing the controlled rotation of single o-MeO-DMBI molecules anchored on Au(111)citations
- 2017Molecular Self-Assembly Driven by On-Surface Reduction: Anthracene and Tetracene on Au(111)citations
- 2016Influence of organic ligands on the line shape of the Kondo resonancecitations
- 2016Electronically Driven Single-Molecule Switch on Silicon Dangling Bondscitations
- 2015Supramolecular Rotor and Translator at Work: On-Surface Movement of Single Atomscitations
- 2014Quantum coherence of bulk electrons on metals revealed by scanning tunneling spectroscopycitations
- 2013Moving Nanostructures: Pulse-Induced Positioning of Supramolecular Assembliescitations
- 2012STM manipulation of a subphthalocyanine double-wheel molecule on Au(111)citations
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article
Metal Halide Perovskite Surfaces with Mixed A‐Site Cations: Atomic Structure and Device Stability
Abstract
<jats:title>Abstract</jats:title><jats:p>Mixing cations in the perovskite structure has been shown to improve optoelectronic device performance and stability. In particular, Cs<jats:sub>x</jats:sub>MA<jats:sub>1‐x</jats:sub>PbBr<jats:sub>3</jats:sub> (MA = CH<jats:sub>3</jats:sub>NH<jats:sub>3</jats:sub>) has been used to build high‐efficiency light‐emitting diodes. Despite those advantages, little is known about the exact location of the cations in the mixed perovskite film, and how cation distribution affects device properties and stability. By using scanning tunneling microscopy , the exact atomic structure of the mixed cation Cs<jats:sub>x</jats:sub>MA<jats:sub>1‐x</jats:sub>PbBr<jats:sub>3</jats:sub> perovskite interface is revealed. In addition, X‐ray photoelectron spectroscopy, ultraviolet photoemission spectroscopy and inverse photoemission spectroscopy are used to study the stability and electronic properties of the Cs<jats:sub>x</jats:sub>MA<jats:sub>1‐x</jats:sub>PbBr<jats:sub>3</jats:sub> perovskite film. Partial substitution of MA<jats:sup>+</jats:sup> by Cs<jats:sup>+</jats:sup> induces a modification of the perovskite surface structure, leading to improved device stability is shown. These results provide a better understanding of the key parameters involved in the stability of mixed cation perovskite solar cells.</jats:p>