We propose and validate an approach to obtain ultra-broadband terahertz absorber by taking the advantages of absorption surface plasmon resonance in combination with intrinsic mode. The is composed a gold (Au) bottom layer patterned graphene embedded TOPAS polymer, exhibiting coupling modes. single-layer C4 symmetric regular polygons which are arranged circle circumscribed (CUPs) or inscribed (...

in this research a flat plate solar air collector was investigated under direct solar radiation consisted of a slatted glass cover, perforated absorber aluminum sheets (porosity 0.0177, 0.0314 and absorber thickness of 2.5 mm). the effect of porosity on absorber efficiency of collector was evaluated. six levels of air mass flow rates (0.0056 to 0.0385 kg m-2 s-1) were adopted.average solar ener...

We propose a sub-wavelength range-based dual-band tunable ideal terahertz metamaterial perfect absorber. The absorber structure consists of three main layers, with the layer consisting metal I-shaped structure. By simulating incident wave absorbance structure, we found that has more than 99% absorption peaks in both bands. In addition, have investigated relationship between structural and geome...

A CdS thin film buffer layer has been widely used as conventional n-type heterojunction partner both in established and emerging photovoltaic devices. In this study, we perform numerical simulation to elucidate the influence of electrical properties layer, essentially terms carrier mobility concentration on performance SLG/Mo/p-Absorber/n-CdS/n-ZnO/Ag configured devices, by using Solar Cell Cap...

The pressure-based, current-driven impedance control technique known as “Electroacoustic Absorption” has offered new horizons for room modal equalization at low frequencies, steerable anomalous reflection, acoustic transmission attenuation and non-reciprocal wave propagation. Nevertheless, its level of performance is strongly limited by stability constraints. A primary source instability the lo...

The red quasar 3C212 (z = 1.049) is one of the most distant and most luminous AGN which has shown evidence of an X-ray warm absorber. In order to further investigate this unusual quasar, we used Chandra/ACIS-S to observe 3C212 for 19.5 ksec, resulting in a net detection of ∼ 4000 counts. The Chandra data confirm the presence of an excess absorbing column NH ≈ 4 × 10 21 cm at the quasar redshift...

Transient microwave reflectance (TMR) measurements are used to characterize the minority carrier lifetime and background concentration of unintentionally doped (UID) Ga0.5As0.5Sb lattice matched InP at room temperature. A p-i-n sample is measured, with UID GaAsSb as intrinsic absorber. In addition GaAsSb, we determine doping a buried n+ layer. The measured lifetimes 20.5 ± 6.3 0.56 0.23 µs for ...

This work reports plasmon enhanced photoacoustic generation by using a three dimensional plasmonic absorber. The 3D plasmonic absorber comprises a thin polymer film on glass nanopillar arrays with nanogap-rich silver nanoislands. The 3D plasmonic absorber clearly shows 24.6 times higher enhancement of photoacoustic signals at an excitation wavelength of 630 nm than a simple polymeric absorber. ...

This work characterizes defects and phases within Cu2ZnSn(S,Se)4 (CZTS(Se)), an earth-abundant material used to make thin film photovoltaic solar cells. Overall research efforts focus on improving the solar cell device efficiency with the hope that it can be produced at the terawatt energy scale and circumvent material supply bottlenecks of current thin film photovoltaic technology. In this wor...