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The electron confinement in double triangular quantum wells (DTQW) in nanoscale symmetric Double gate InAlAs/InGaAs/InP HEMT (DGHEMT) has been modeled and simulated including quantum effects at gate lengths (Lg) 100nm and 50nm. The trend towards thinner channel and shorter gate lengths is resulting in increased importance of quantum effects, as many of the semi-classical assumptions become invalid...
Solder plays a critical role in packaging because it serves several functions including electrical contacts, mechanical support, adhesion, and signal interconnections. In an attempt to reduce both the environmental and health concerns with using Pb lead based components in electronic packaging, legislation has been passed. One of the main alloys that is used as lead free solder material is SnAgCu...
Low frequency noise has become one of the major issues for an analog mixed signal and RF (radio frequency) circuits [1]. Previous studies have extensively analyzed drain/gate bias and temperature dependence of 1/f (flicker) noise in a strong inversion region [2, 3], whereas 1/f noise in a sub-threshold region has been investigated very little. The demand for low power consumption has increased due...
Nowadays, different types of high-voltage devices which are usually utilized in MOS technology are presented; such as LDMOS, VMOS, DSMOS and etc. LDMOS is more practically useful rather than others especially in radio frequency amplifiers. First, fundamental principles of LDMOS design and important effects of DC such as quasi-saturation, self-heating and impact-ionization were entirely investigated...
In this paper, we have investigated the effect of parameter variations on the electrical characteristics of a RESURF LDMOS. The rate of change in each of the electrical parameters such as cut off frequency, breakdown voltage and drain saturation current as a function of the process parameters has been obtained. Furthermore, a model for the device output characteristics is presented and is verified...
Currently the most popular HBTs model are unscalable and cannot be used for device structure optimization which must primarily be calibrated with already fabricated and measured devices. To overcome the problem, a physical model for scaling and optimizing layers structure of InGaAs/InP double heterojunction bipolar transistors (DHBTs) based on hydrodynamic simulation is developed in this paper.
Model parameter extraction plays an important role in bridging semiconductor manufacturing and integrated circuit design. Most commercial extraction and optimization tools have a default extraction and optimization procedure. PSO (Particle Swarm Optimization) is a global random searching algorithm with swarm intelligence, having the strong searching capability on nonlinear problems [1–2]. Compared...
Due to excellent surface passivation achieved by the overlying hydrogenated amorphous silicon (a-Si:H) layer which yields very high efficiency solar cells[1], the heterojunction silicon solar cells concept offers a possibility of reducing the total cost of PV production to an acceptable value for commercial viability and fulfill world's energy needs. The HIT solar cell performance has significantly...
Organic field effect transistor (OFET) having advantages such as simple fabrication process, large area coverage, structural flexibility and low cost have been much attention because of the feasibility of application in flexible display, information tag, smart card and e-paper etc. [1]. High on-off ratio, low turn-on voltage and fast response time are most critical issues in the research and development...
The critical issues in the improvement of organic photovoltaic cell efficiency are excition rate, charge separation and carrier mobility. Recently, the modification of interface between metal electrode and organic active layer was widely studied in order to obtain high performance device. In general, bulkheterojunction organic photovoltaic cell blended with P3HT as an electron donor and PCBM as an...
An active area of research in the field of photovoltaics that strives to significantly improve energy conversion efficiencies involves the exploration and manipulation of device physical structures. With knowledge gleaned from the fabrication of standard planar organic solar cells, our group has developed a technique for creating nanoscale nested structures capable of accommodating organic photoactive...
Withscaling applications in the aerospace technology of the large-scale CMOS integrated circuit, the reliability of CMOS device has been the key factor which guarantees the normal work of aerospace equipment. Due to the high-energy particles surrounding the Earth captured by the radiation belt, the CMOS circuits may be hit by them when the aerospace equipment are running around the earth, which may...
Memristors, nonvolatile bipolar resistive switching devices first intentionally fabricated in 2008 [1], have attracted attention for use in a wide range of applications. To date, most memristors have been fabricated from TiOx [1] or TaOx [2]. However, it is necessary to explore the memristive properties of other dielectric materials, because these dielectrics may have advantageous properties that...
The A new class of Macroelectronic devices appropriate for large area flexible electronics, supercapacitors, batteries, and solar cells rely on the biological dictum that ‘form defines function’ and use structural geometry to compensate for the poor intrinsic transport in materials processed at low temperature [1]. Bulk heterostructure solar cells with two intermixed polymers acting as the acceptor/donor...
A challenge with the study of organic thin-film transistors rests in understanding the mechanism behind microstructure formation and its effects on the charge carrier mobility. Often, increased order in the molecular packing of the organic semiconductor film results in a superior mobility. The microstructure of the organic thin-films can be tuned by chemically modifying the surfaces using treatments,...
Previous investigators have demonstrated metal/HfOx/Cu devices with stable, long-term read/write endurance, low switching energy, and high on/off ratios[1,2]. To the best of the authors' knowledge there has been no published research that compares the resistive switching properties of crystalline and amorphous HfOx. The HfOx for this work was deposited on top of an electroplated copper thin film by...
Array microphones have a variety of applications including directional listening, speaker localization, ultrasonic imaging, and boundary layer turbulence measurement.[1][2] Two approaches are commercially used for these applications; arrays of discrete microphones, and one dimensional arrays of electroded piezoelectric materials directly connected to amplification circuitry.[3] Two dimensional array...
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