American University in Cairo

About: American University in Cairo is a education organization based out in Cairo, Egypt. It is known for research contribution in the topics: Population & Context (language use). The organization has 2472 authors who have published 5339 publications receiving 73741 citations.

Plasmonic silicon solar cells using titanium nitride: a comparative study

Abstract: Plasmonic materials, especially silver, are widely used to increase efficiency of solar cells due to their ability to localize the light in nanoscale This tight confinement increases the absorption of a thin film solar cell However, these materials are expensive and increase the cost/watt of the solar cell Thus, finding an abundant and cheap material with a comparable plasmonic effect can dramatically reduce solar cell cost by enabling the use of ultrathin active layers In this work, we investigate TiN as an alternative cheap and abundant plasmonic material TiN is also more CMOS compatible Several TiN plasmonic solar cell configurations are studied and analyzed These studies show that the TiN plasmonic solar cell has a comparable performance for back side plasmonic configuration

Metal–Organic frameworks encapsulated with vanadium-substituted heteropoly acid for highly stable asymmetric supercapacitors

Abstract: Herein, we report on a facile one pot synthesis of polyoxometalates encapsulated zeolite imidazolate framework cages (PMo10V2@ZIF-67). The morphological and structural properties of the as synthesized materials were investigated via FESEM, EDS, XRD and FTIR techniques. Moreover, N2 adsorption/desorption isotherms and XPS measurements were carried out to elucidate the textural properties and composition of the fabricated materials. Upon their use as supercapacitor electrodes, the PMo10V2@ZIF-67 electrode exhibited a maximum specific capacitance of 765 F/g at a scan rate of 5 mV/s. Furthermore, a supercapacitor device was assembled using activated carbon as the negative electrode and PMo10V2@ZIF-67 as the positive electrode, delivering a specific power of 702 W/kg and a corresponding specific energy of 20.9 Wh/kg at a charging current density of 1 A/g. In addition, the device shows an excellent long term stability and high Columbic efficiency over 5000 charging and discharging cycles at a charging and discharging current density of 5 A/g.