Анализ с помощью системы TCAD токов утечки 45 нм МОП транзисторной структуры с high-k диэлектриком
The models of electrophysical effects built-into Sentaurus TCAD have been tested. The models providing an adequate modeling of deep submicron high-k MOSFETs have been selected. The gate and drain leakage currents for 45 nm MOSFETs with polysilicon gate oxide and SiO2, SiO2/HfO2 and HfO2 gate dielectrics have been calculated using TCAD. It has been shown that the replacement of the traditional SiO2 gate by an equivalent HfO2 dielectric reduces the gate leakage current by several orders of magnitude due to the elimination of the impact of the tunneling effect. Besides, the threshold voltage, saturation drain current, mobility, transconductance, etc., degrade within a range of 10–20%.
New semi-empirical model accounting for TID dependences of bulk, oxide, HfO2/Si interface trap densities, carrier mobilities, lifetime of device material was developed and introduced into TCAD tool. TID response of 45nm high-k MOSFETs on bulk and SOI substrate was simulated.
An electro-thermal modeling of modern SiGe and Si bipolar transistor structures using TCAD Sentaurus Synopsys has been carried out. It has been shown that for SiGe heterojunction bipolar transistors, operating at high current density, the internal temperature is higher than for identical Si transistors. As a result a stronger degradation of the device parameters and electrical characteristics is observed.
The models of electro-physical effects built-into Sentaurus TCAD have been tested. The models providing an adequate modeling of deep submicron high-k MOSFETs have been selected. The gate and drain leakage currents for 45 nm MOSFET with PolySi gate and SiO2, SiO2/HfO2 and HfO2 gate dielectrics have been calculated using TCAD. It has been shown that the replacement of traditional SiO2 by an equivalent HfO2 dielectric considerably reduces the gate leakage current by several orders due to elimination of the tunneling effect influence. Besides, the threshold voltage, saturation drain current, mobility, transconductance, etc. degrade witahin 10-20% range.
Generalized error-locating codes are discussed. An algorithm for calculation of the upper bound of the probability of erroneous decoding for known code parameters and the input error probability is given. Based on this algorithm, an algorithm for selection of the code parameters for a specified design and input and output error probabilities is constructed. The lower bound of the probability of erroneous decoding is given. Examples of the dependence of the probability of erroneous decoding on the input error probability are given and the behavior of the obtained curves is explained.
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.