201 research outputs found
Band Alignment and Electrical Investigations of Ultra-Thin Al2O3 on Si by E-beam Evaporation
No full textThe continuous downscaling leads the search of high-gate dielectrics. The films amorphous in nature offered good mechanical flexibility, smooth surfaces and better uniformity associated with low leakage current density. In this work, 16 nm thick amorphous Al2O3 films on silicon substrate are fabricated by E-beam evaporation. The high value of refractive index (1.76) extracted from ellipsometry analysis directs the deposition of compact film. The AFM analysis reveal a flat surface with small RMS surface roughness 1.5 angstrom. The band gap is extracted from O-1s electron loss spectra and was found 6.7 eV and band alignment of Al2O3/Si is derived from the UPS measurements. The films are incorporated in Metal Insulator -Semiconductor (MIS) capacitor to perform the electrical measurement. The flat band voltage (V-FB), dielectric constant () and oxide trapped charges (Q(ot)) extracted from high frequency (1 MHz) C-V curve are - 0.4 V, 8.4 and 2 x 10(11) cm(-2), respectively. The small flat band voltage - 0.4 V, narrow hysteresis and very little frequency dispersion suggest an exceptional good Al2O3/Si interface with small quantity of trapped charges in the oxide. The leakage current density was 4.27 x 10(-8) A/cm(2) at 1 V. The moderate dielectric constant and low leakage current density with ultra-smooth surface is quite useful towards its application in future CMOS and memory devices
Impact of Time-dependent Annealing on TiO2 Films for CMOS application
No full textPost-deposition annealing (PDA) is the inherent part of sol-gel fabrication process to achieve the optimum device performance, especially in CMOS applications. The annealing removes the oxygen vacancies and improves the structural order of dielectric films. The process also reduces the interface related defects and improves the interfacial properties. In this work, we have integrated the sol-gel spin-coating deposited high-TiO2 films in MOS. The films are fired at 400 degrees C for the duration of 20, 40, 60 and 80 min. The thicknesses of the films were found to be of similar to 30 nm using ellipsometry. The (Al/TiO2/p-Si) devices were examined with current-voltage (I-V) and capacitance-voltage (C-V) at room temperature to understand the influence of firing time. The C-V and I-V characteristic showed a significant dependence on annealing time such as variation in dielectric constant and leakage current. The accumulation capacitance (Cox), dielectric constant (kappa) and the equivalent oxide thickness (EOT) of the film fired for 60 min were found to be 458 pF, 33, and 4.25nm, respectively with a low leakage current density (1.09 10(-6) A/cm(2)) fired for 80 min at + 1 V
Statistical mechanics and combinatorics of some discrete lattice models
No full textMany problems in statistical physics involve enumeration of certain objects. In this thesis, we apply ideas from combinatorics and statistical physics to understand three different lattice models.
We investigate the structure of the nonequilibrium stationary state (NESS) of a system of first and second class particles on
L sites of a one-dimensional lattice in contact with first class particle reservoirs at the boundary sites and second class particles constrained to lie the system. The internal
dynamics are described by the usual totally asymmetric exclusion process (TASEP) with second class particles. We show in a conceptually simple way how pinned and unpinned (fat) shocks determine the general structure of the phase diagram. We also point out some unexpected features in the microscopic structure of the NESS both for finite L and in the limit of large L. In the latter case the local distribution of second class particles is given by an equilibrium pressure ensemble with a pair potential between neighboring particles which grows logarithmically with distance.
We model a long linear polymer constrained
between two plates as a walk on a two-dimensional lattice constrained to lie between two lines, x=y and x=y+w, which interacts with these lines via contact parameters s and t. The atomic steps of the walk can be taken to be from an arbitrary but fixed set S
with the only condition being that the first
coordinate of every element in S is strictly positive. For any such S and any w, we prescribe general algorithms (fully implemented in Maple) for the automated calculation of several mathematical and physical quantities of interest.
Ferrers (or Young) diagrams are very classical objects in representation theory, whose half-perimeter generating function of Ferrers diagrams is a straightforward rational function. We construct two new classes of Ferrers diagrams, which we call wicketed and gated Ferrers diagrams, which have internal voids in the shape of Ferrers diagrams, and calculate their half-perimeter generating functions, one of which is closely related to the generating function of the Catalan numbers, using a more abstract version of the usual transfer matrix method.Ph.D.Includes bibliographical references (p. 81-85)
Solid-solution Zn(O,S) thin films: Potential alternative buffer layer for Cu2ZnSnS4 solar cells
No full textTrading arrangements and industrial development
Get PDFHow do different trading arrangements influence the industrialization process of developing countries? Can preferential trading arrangements (PTAs) be superior to multilateral liberalization, or at least an alternative when multilateral liberalization proceeds slowly? If so, what form should the PTAs take? Are developing countries better advised to seek PTAs with industrial countries or among themselves? Traditional analysis of these issues has been based on the idea of trade creation and trade diversion. The problem with this analysis is that it starts from assuming a pattern of comparative advantage of newly industrialized countries. The experience of these countries suggests the need for an analysis in which the pattern of comparative advantage is not set in stone but is potentially flexible, and in which less developed countries can develop and converge in both income and economic structure to industrial economies. The authors outline an alternative approach for analyzing the role of trade in promoting industrial development. There are few fundamental differences between countries that generate immutable patterns of comparative advantage. Instead the pattern of trade and development in the world economy is determined mainly by history. Cumulative causation has created concentrations of industrial activity in particular locations (industrial countries) and left other areas more dependent on primary activities. Economic development can be thought of as the spread of these concentrations from country to country. Different trading arrangements may have a major impact on this development process. By changing the attractiveness of countries as a base for manufacturing production they can potentially trigger or postpone industrial development. This approach explains why firms are reluctant to move to economies that have lower wages and labor costs, and shows how trade liberalization can change the incentives to become established in developing countries. It provides a mechanism through which import liberalization can have a powerful effect in promoting industrialization. And it suggests that import liberalization may create or amplify differences between liberalizing countries with the possible political tensions this may create. While these features are consistent with the world economy, they fall short of providing convincing empirical support for the approach. Using the approach, the authors derive number of conclusions about the effects of trade liberalization. First, that unilaterally liberalizing imports of manufactures can promote development of the local manufacturing industry. The mechanism is forward linkages from imported intermediates, but this may be interpreted as part of a wider package of linkages coming from these imports. Second, the gains from liberalization through PTA membership are likely to exceed those obtained from unilateral action. South-South PTAs will be sensitive to the market size of member states, and North-South PTAs seem to offer better prospects for participating Southern economies, if not for North and excluded countries. Third, the effects of particular schemes (such as the division of benefits between Southern economies) will depend on the characteristics of the countries and cross-country differences in these characteristics.Economic Theory&Research,Environmental Economics&Policies,Water and Industry,Labor Policies,Banks&Banking Reform,Economic Theory&Research,Environmental Economics&Policies,TF054105-DONOR FUNDED OPERATION ADMINISTRATION FEE INCOME AND EXPENSE ACCOUNT,Trade and Regional Integration,Water and Industry
Determination of effective atomic number of biomedical samples using Gamma ray back-scattering
No full textHighlights of Library Automation related documents in the INSPEC
Get PDFThe paper has attempted to analyse the Library Automation related records in the INSPEC (1969 to July 2004). The growth of Library Automation related literature, country of input, scattering of literature in different publication types, core journals publishing Library Automation related publications, language-wise proportion of the literature, content analysis through keywords/descriptors, availability of URLs (Universal Resource Locator) for full text articles as alternative locations were the main focus of the study. After the year 1984, the literature grows approximately linearly with a growth rate of about 600 items per year. The USA is the predominant publishing country of Library Automation related literature. Journals are the most preferred publication media, followed by Conference/Proceedings-Papers, Book-Chapters, and Reports publications. Most productive journals are: Library Hi Tech, followed by Computers in Libraries, VINE, Information Technology and Libraries, and Program. English articles constitute 91.83% of the total literature. That means the non-English articles constitute only 8.17%. The keyword analysis indicates that the key areas of Library Automation were cataloguing; academic-libraries; information-retrieval; Internet; and information-services. The most occurred URL was http://www.dlib.org/ as alternative locations in the availability notes of Library Automation related records
India’s Macroeconomic Performance and Policies since 2000
Get PDFThe paper reviews Indias macroeconomic performance and policies since 2000. The first section briefly summarizes key macroeconomic developments regarding economic growth, inflation, external balance, the fiscal situation and aggregate savings and investment. The second section considers some of the challenges posed to macroeconomic management in this period and the efficacy of the policy responses adopted. In particular, it analyses the progress in fiscal consolidation and the policies adopted to deal with the challenge of the unprecedented surge in external capital inflows into India. The final section outlines some of the major macro policy issues that need to be addressed in the years ahead, including : the resurgence of high fiscal deficits; the issues relating to external convertibility and exchange rate management; the role of the Reserve Bank of India in macroeconomic policy and coping with a weak international economic environment.economic growth, inflation, Fiscal Policy, savings and investment, Capital Inflows, exchange rate policy, central bank role
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