排序方式: 共有55条查询结果,搜索用时 296 毫秒
1.
Chao Wen Alexander G. Banshchikov Yury Y. Illarionov Werner Frammelsberger Theresia Knobloch Fei Hui Nikolai S. Sokolov Tibor Grasser Mario Lanza 《Advanced materials (Deerfield Beach, Fla.)》2020,32(34):2002525
Mechanically exfoliated 2D hexagonal boron nitride (h-BN) is currently the preferred dielectric material to interact with graphene and 2D transition metal dichalcogenides in nanoelectronic devices, as they form a clean van der Waals interface. However, h-BN has a low dielectric constant (≈3.9), which in ultrascaled devices results in high leakage current and premature dielectric breakdown. Furthermore, the synthesis of h-BN using scalable methods, such as chemical vapor deposition, requires very high temperatures (>900 °C) , and the resulting h-BN stacks contain abundant few-atoms-wide amorphous regions that decrease its homogeneity and dielectric strength. Here it is shown that ultrathin calcium fluoride (CaF2) ionic crystals could be an excellent solution to mitigate these problems. By applying >3000 ramped voltage stresses and several current maps at different locations of the samples via conductive atomic force microscopy, it is statistically demonstrated that ultrathin CaF2 shows much better dielectric performance (i.e., homogeneity, leakage current, and dielectric strength) than SiO2, TiO2, and h-BN. The main reason behind this behavior is that the cubic crystalline structure of CaF2 is continuous and free of defects over large regions, which prevents the formation of electrically weak spots. 相似文献
2.
Xu Jing Yury Illarionov Eilam Yalon Peng Zhou Tibor Grasser Yuanyuan Shi Mario Lanza 《Advanced functional materials》2020,30(18)
The continuous miniaturization of field effect transistors (FETs) dictated by Moore's law has enabled continuous enhancement of their performance during the last four decades, allowing the fabrication of more powerful electronic products (e.g., computers and phones). However, as the size of FETs currently approaches interatomic distances, a general performance stagnation is expected, and new strategies to continue the performance enhancement trend are being thoroughly investigated. Among them, the use of 2D semiconducting materials as channels in FETs has raised a lot of interest in both academia and industry. However, after 15 years of intense research on 2D materials, there remain important limitations preventing their integration in solid‐state microelectronic devices. In this work, the main methods developed to fabricate FETs with 2D semiconducting channels are presented, and their scalability and compatibility with the requirements imposed by the semiconductor industry are discussed. The key factors that determine the performance of FETs with 2D semiconducting channels are carefully analyzed, and some recommendations to engineer them are proposed. This report presents a pathway for the integration of 2D semiconducting materials in FETs, and therefore, it may become a useful guide for materials scientists and engineers working in this field. 相似文献
3.
S. Tyaginov I. Starkov H. Enichlmair Ch. Jungemann J.M. Park E. Seebacher R. Orio H. Ceric T. Grasser 《Microelectronics Reliability》2011,51(9-11):1525-1529
We develop an analytical model for hot-carrier degradation based on a rigorous physics-based TCAD model. The model employs an analytical approximation of the carrier acceleration integral (calculated with our TCAD approach) by a fitting formula. The essential features of hot-carrier degradation such as the interplay between single-and multiple-electron components of Si–H bond dissociation, mobility degradation during interface state build-up, as well as saturation of degradation at long stress times are inherited. As a result, the change of the linear drain current can be represented by the analytical expression over a wide range of stress conditions. The analytical model can be used to study the impact of device geometric parameters on hot-carrier degradation. 相似文献
4.
Ph. Hehenberger P.-J. Wagner H. Reisinger T. Grasser 《Microelectronics Reliability》2009,49(9-11):1013-1017
Initial NBTI degradation is often explained by elastic hole trapping which also considerably distorts long-term measurements. In order to clarify this issue, short-term NBT stress measurements are performed using different temperatures, stress voltages, and oxide thicknesses. The data shows a clear temperature activation and a super-linear voltage dependence, thereby effectively ruling out elastic hole tunneling. Rather, our data supports an explanation based on a thermally activated hole capture mechanism. 相似文献
5.
Jesse A. Ahlers Jordan A. Grasser Brett T. Loveless Darrin S. Muggli 《Catalysis Letters》2007,114(3-4):185-191
At room temperature in the absence of gas-phase oxygen, reduced Cu on Cu/ZnO extracts oxygen from the ZnO lattice to reoxidize
the surface. After 120 min at room temperature, diffusion of lattice oxygen reoxidizes reduced Cu/ZnO to 3% of its completely
oxidized state. When gas-phase oxygen is present, it promotes the partial reoxidation of the reduced Cu/ZnO surface at room-temperature. 相似文献
6.
D. Fink A. Chandra W.R. Fahrner K. Hoppe H. Winkelmann A. Saad P. Alegaonkar A. Berdinsky D. Grasser R. Lorenz 《Vacuum》2008,82(9):900-905
In the past years, fundaments were set for a new type of electronics which is based on tracks in insulators formed by individual or multiple swift heavy ions. Due to the possibility of inserting any (semi)conducting material into these tracks, various active and passive electronic devices can be created. Among them are also transistor-like and Esaki diode-like elements. As many of these structures have sensing properties and the capability to undergo logic decisions, autonomous intelligent sensors appear to be a favourite field for future application. The use of liquid conductors may even expand the range of applicability towards medical implants. 相似文献
7.
It is well known that for the design and simulation of state-of-the-art circuits thermal effects like self-heating and coupling between individual devices must be taken into account. As compact models for modern or experimental devices are not readily available, a mixed-mode device simulator capable of thermal simulation is a valuable source of information, Considering self-heating and coupling effects results in a very complex equation system which can only be solved using sophisticated techniques. We present a fully coupled electrothermal mixed-mode simulation of an SiGe HBT circuit using the design of the μA709 operational amplifier. By investigating the influence of self-heating effects on the device behavior we demonstrate that the consideration of a simple power dissipation model instead of the lattice heat flow equation is a very good approximation of the more computation time consuming solution of the lattice heat flow equation 相似文献
8.
S. E. Tyaginov Yu. Yu. Illarionov M. I. Vexler M. Bina J. Cervenka J. Franco B. Kaczer T. Grasser 《Journal of Computational Electronics》2014,13(3):733-738
We model the main characteristics of metal-insulator-silicon field-effect transistors (MISFETs) with different gate insulators using the carrier energy distribution function calculated with a Spherical Harmonics Expansion method. In addition to standard devices with Silicon Dioxide or Oxynitride we study a hypothetical MISFET with a rather new crystalline dielectric-Calcium Fluoride. The real physical parameters of the \(\hbox {CaF}_{2}\) /Si tunnel barrier are used in our simulations. The obtained characteristics of the transistors with \(\hbox {CaF}_{2}\) are, in some details, better than those of the devices with traditional oxides. Being a step forward in the context of the industrial implementation of fluorite, this work opens the possibility of simulating the characteristics of different silicon-based devices with crystalline insulators. 相似文献
9.
A review of hydrodynamic and energy-transport models for semiconductor device simulation 总被引:7,自引:0,他引:7
Grasser T. Ting-Wei Tang Kosina H. Selberherr S. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2003,91(2):251-274
Since Stratton published his famous paper four decades ago, various transport models have been proposed which account for the average carrier energy or temperature in one way or another. The need for such transport models arose because the traditionally used drift-diffusion model cannot capture nonlocal effects which gained increasing importance in modern miniaturized semiconductor devices. In the derivation of these models from Boltzmann's transport equation, several assumptions have to be made in order to obtain a tractable equation set. Although these assumptions may differ significantly, the resulting final models show various similarities, which has frequently led to confusion. We give a detailed review on this subject, highlighting the differences and similarities between the models, and we shed some light on the critical issues associated with higher order transport models. 相似文献
10.
Matthias F. Groh Alexander Wolff Matthias A. Grasser Michael Ruck 《International journal of molecular sciences》2016,17(9)
Ionic liquids (ILs) have been proven to be valuable reaction media for the synthesis of inorganic materials among an abundance of other applications in different fields of chemistry. Up to now, the syntheses have remained mostly “black boxes”; and researchers have to resort to trial-and-error in order to establish a new synthetic route to a specific compound. This review comprises decisive reaction parameters and techniques for the directed synthesis of polyions of heavy main-group elements (fourth period and beyond) in ILs. Several families of compounds are presented ranging from polyhalides over carbonyl complexes and selenidostannates to homo and heteropolycations. 相似文献