Graphene is a promising material for use in photodetectors for the ultrawide wavelength region: from ultraviolet to terahertz. Nevertheless, only the 2.3% light absorption of monolayer graphene and fast recombination time of photo-excited charge restrict its sensitivity. To enhance the photosensitivity, hybridization of photosensitive material and graphene has been widely studied, where the acc...

This paper is based on analysis of a common source - common gate low noise transconductance amplifier (CS-CG LNTA). Conventional noise analyses equations are modified by considering to the low output impedance of the sub-micron transistors and also, parasitic gate-source capacitance. The calculated equations are more accurate than calculated equations in other works. Also, analyses show that th...

A prototype of a metal–insulator–semiconductor field-effect transistor based on PbSnTe:In/(111)BaF2 film with an Al2O3 gate dielectric was designed for the first time. With voltage applied in range – 7.7 V < Ugate +7.7 relative modulation drain-source current Ids/Ids attained near five-fold change at T = 4.2 K. When illuminated rela-tively low (~100 photon/s) fluxes, negative photoconductiv...

Organic field-effect transistors with ionic liquids have attracted much attention, since the induce an intense electric field at a semiconductor interface, resulting in high concentration of charge carriers. It is expected that such strong fields and highly doped charges nontrivial effects on electronic band structures. Recently, blue shift peak wavelength photo-absorption spectra for DNBDT-mon...

in this paper, calcium stannate nanoparticles were synthesized by a fast and simple co-precipitation procedure. for casno3 preparation ammonia was used as precipitation agent. the effect of various surfactants such as cationic, anionic and neutral on the morphology of the products was investigated. by changing in ca(sal)2 as a new precursor different morphologies were obtained. ligand as a capp...