SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 47: 2D Materials II: Growth, Structure and Substrate Interaction I

O 47.2: Talk

Wednesday, March 29, 2023, 10:45–11:00, GER 37

Phase Transitions of the BlueP-Au-network on Au(111) by Intercalation of Potassium — Philip Grimm, •Felix Otto, Maximilian Schaal, Florentine Friedrich, Roman Forker, and Torsten Fritz — Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany

In 2014, a new elemental semiconductor was postulated: Blue Phosphorene (BlueP). This monolayer of P atoms offers a layer thickness-dependent band gap and high charge carrier mobility. However, the synthesis of a highly ordered and stable monolayer of BlueP is still a challenge and could only be achieved on gold substrates by constructing a Au-P network. This undesirable coupling, which leads to a change in electronic properties, could be mitigated by the intercalation of potassium. The goal is to synthesize a free-standing monolayer of BlueP. The effects of substrate temperature during K deposition and the order of deposition of phosphorus and potassium on Au(111) were investigated. Structural properties were characterized by LEED and RHEED, chemical properties by XPS, and electronic properties by photoelectron spectroscopy methods ((AR)UPS and PMM). In the end, a (2×2) superstructure is obtained. This superstructure exhibited the most promising electronic properties, which were very close to those of the free-standing BlueP. It is assumed that K and P together form the basis of the (2×2) superstructure, since the reactive bonds of potassium could be saturated and stabilized by phosphorus. At temperatures of 250 ^∘C, the BlueP-Au network dissolves under the influence of potassium deposition and various intermediates are formed.