Algarni, Sabah E.Qasrawi, Atef FayezKhusayfan, Najla M.2022-11-242022-11-242022Algarni, S. E., Qasrawi, A. F., Khusayfan, N. M., Enhanced Optical and Electrical Interactions at the Pt/MgSe Interfaces Designed for 6G Communication Technology. Cryst. Res. Technol. 2022, 2200185. https://doi.org/10.1002/crat.2022001850232-1300https://doi.org/10.1002/crat.202200185https://hdl.handle.net/20.500.12713/3391Magnesium selenide thin films are coated onto glass and semitransparent Ptsubstrates (nanosheets) by the vacuum evaporation technique under avacuum pressure of 10?5mbar. The effect of Pt nanosheets of thicknesses of100 nm on the structural, compositional, optical, and electrical properties ofMgSe is explored. It is found that platinum nanosheets enhance the lightabsorbability in the visible and infrared ranges of light. They slightly redshiftthe energy bandgap and decrease the dielectric constant. The stronginteraction between Pt and MgSe increases the electrical conductivity by fiveorders of magnitude. Pt forms shallow impurity levels in the energy bandgapof MgSe allowing the tunneling process at the Pt/MgSe interfaces. Practically,a Pt/MgSe/Pt tunneling type device is fabricated and tested by the microwaveimpedance spectroscopy technique. It is found that Pt/MgSe/Pt devices canexhibit resonance–antiresonance and negative capacitance effects which areimportant in electronic circuits as parasitic capacitance cancelers, signalamplifiers, and noise reducers. In addition, evaluation of the cutoff frequencyspectra has shown the ability of using the Pt/MgSe/Pt devices as microwaveresonators appropriate for 5G/6G technologies. A cutoff frequency larger than70 GHz can be achieved by imposing ac signal of amplitude of 0.10 V.eninfo:eu-repo/semantics/closedAccessArticleWOS:0008829555000012-s2.0-85142204777Q310.1002/crat.202200185Q3