Enhancement of the performance of the Cu₂Se band filters via Yb nanosandwiching

Abstract

In this article, we report the experimental and theoretical modeling on the band pass filters that are made of two thin film layers of Cu 2 Se coated onto aluminum substrates and nanosandwiched with 50 nm ytterbium layers. The nanosandwiching of Yb between two layers of Cu 2 Se is found to decrease the lattice constant, the defect density, and the strain and increase the grain size in the Cu 2 Se. Electrically, it is observed that, Al/Cu 2 Se/Al structure exhibits wave trap characteristics with notch frequency of 1.31 GHz. The Yb-layers improved the performance of the band pass filters by increasing the amplitude of the reflection coefficients, increasing the return loss values and decreasing the voltage standing wave ratios. The calculated conduction and wave trapping parameters nominate the Yb-nanosandwiched Cu 2 Se films for use in communication technology as they exhibit negative capacitance effect and narrow band pass range. K E Y W O R D Sband pass filters, conductivity, Cu 2 Se, negative capacitance, X-ray

Characterization of Au/As2Se3 Multifunctional Tunneling Devices

“…The capacitance remains negative in the frequency domain of 0.24–1.80 GHz. The negative capacitance (NC) effect is an advantage that indicates the applicability of the Au/As 2 Se 3 devices as microwave filters, as parasitic capacitance cancellers, and as noise reducers . The experimental data of the capacitance spectra can be reproduced by the Qasrawi–Ershov approach for AC conduction which assumes that the propagating electrical signals oscillate against already‐existing oscillatory dipoles which exhibit electron‐ and hole‐coupled plasmons of frequencies of and , respectively.…”

“…This style of variations always arises from the current conduction by combined (σ T ) mechanisms of tunneling and correlated barrier hopping (CBH). [17,18] Conductivity takes the form as follows…”

“…At this value, conductivity exhibits a maxima, then it starts decreasing with increasing frequency. This style of variations always arises from the current conduction by combined (σ T ) mechanisms of tunneling and correlated barrier hopping (CBH) . Conductivity takes the form as followsand…”