In this work, we describe the charge transport in 2-D Schottky barrier field-effect transistors (SB-FETs) based on carrier injection at contacts. We first develop a numerical model for thermionic and field-emission processes of that occur contact. The is then simplified to yield an analytic equation current versus voltage ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xl...

In a current density versus temperature (J-T) (Miram) curve in thermionic electron emission, experimental measurements demonstrate there is smooth transition between the exponential region and saturated emission regions, which sometimes referred to as "roll-off" or "Miram knee". The shape of Miram knee an important figure merit for vacuum cathodes. Specifically, cathodes with sharp at low flat ...

Real-space imaging of full-morphological, angstrom-scale structural dynamics occurring on the femtosecond (fs) timescale is possible with ultrafast electron microscopy (UEM) via the stroboscopic pump-probe methodology enabled by interfacing an otherwise standard TEM with a short-pulsed laser system [1-3]. The technology has matured to the point that commercial systems, such as the FEI Tecnai Fe...

Abstract Detecting humidity have been remained a continuing concern within some important areas such as structural health, food processing, industrial well agricultural products. In this study, novel optical sensor is introduced based on the thermionic emission of tungsten filament using fluorescent lamp set-up. Estimated blue compliant charged coupling device camera in image was confirmed an a...

Thin film coolers can provide large cooling power densities compared to bulk thermoelectrics due to the close spacing of hot and cold junctions. Important parameters in the design of such coolers are investigated theoretically and experimentally. A three-dimensional ~3D! finite element simulator ~ANSYS! is used to model self-consistently thermal and electrical properties of a complete device st...

Conversion of sunlight by photon-enhanced thermionic emission (PETE) combines a photonic process similar to photovoltaic cells, and a thermal process similar to conventional thermionic converters. As a result, the upper limit on the conversion efficiency of PETE devices is not the same as the Shockley– Queisser (SQ) limit that corresponds to the bandgap of the absorbing material, nor to the Car...