Semiconducting Systems

Semiconducting systems of low dimensionality, so-called superlattices, are frequently used in the field of micro-electronics In one configuration, these... 

If results are required at very high temperatures, as in experiments related to steel making, even short-term survival makes severe demands on the construction of the cell (Komarek and Ipser 1984). However, oxygen concentration cells have been employed with molten ionic slags to determine the thermodynamics of oxide formation in iron between 1500-1600°C (Kay 1979). Other applications include the use of YSZ for studies of semiconducting systems (Sears and Anderson 1989, Lee et al. 1992). 

A. M. Myasnikov and N. N. Gerasimenko, Ion Implantation and Thermal Annealing of III-V Compound Semiconducting Systems Some Problems of III-V Narrow Gap Semiconductors... 

Numerical solutions have been presented for the impedance response of semiconducting systems that accoimt for the coupled influence of transport and kinetic phenomena, see, e.g., Bonham and Orazem. Simplified electrical-circuit analogues have been developed to account for deep-level electronic states, and a graphical method has been used to facilitate interpretation of high-frequency measurements of capacitance. The simplified approaches are described in the following sections. 

The excitation of electrons in semiconducting systems, as described in Chapter 12, follows an Arrhenius temperature dependence, e.g.. 

Currently, work on translation symmetry capabilities in 1, 2 and 3 dimensions is in progress. Since first applications on insulating or semiconducting systems with relatively large unit cells are envisaged, T-point orbited calculations are most economic and have been already implemented. 

Mukhopadhyay et al. first used LB films of specially substituted phthalocyanine molecules to sense toluene vapor based on the changes in the electrical conductivity [9]. Phthalocyanine and porphyrin derivatives are p-type semiconductors. The interaction with n-electron systems can lead to a cofacial orientation of the nucleus, resulting in a one-dimensional semiconducting system. The exposure to the VOCs may change the cofacial molecular orientation and, as a consequence, the conductivity. However, the interaction between the VOCs and the sensitive molecules is not very strong, as these VOCs are not strong electron donors or electron acceptors. A very low conductivity of 10 to 10 S/cm was usually measured when the sensitive layers were exposed to the VOCs, which is difficult to be detected. Therefore, in most cases, the mass transduction and UV-vis absorption method were adopted to detect the presence of organic vapors. 

A well-studied binary system of discotic liquid crystal toward high carrier mobility systems is a blend of two types of triphenylene-based compounds (Fig. 8.5). These two compounds were mixed in expectation to give a new semiconducting system that exhibits enhancement of charge transport efficiency. The concept is based on Complimentary Polytopic Interaction (CPI) [16-18]. 

Mitzithra C, Kaniaris V, Hamilakis S, Kordatos K, Kollia C, Loizos Z (2011) Development and study of new hybrid semiconducting systems involving Cd chalcogenide thin films coated by a fullerene derivative. Mater Lett 65 1651... 

This is the second volume in the NATO ASI series dealing with the topic of hydrogen in solids. The first (V. B76, Metal Hydrides) appeared five years ago and focussed primarily on crystalline phases of hydrided metallic systems. In the intervening period, the amorphous solid state has become an area of intense research activity, encompassing both metallic and non-metallic, e.g. semiconducting, systems. At the same time the problem of storage of hydrogen, which motivated the first ASI, continues to be important. 

It is well known that magnetoconductance (MC) is a sensitive local probe for investigating the microscopic transport parameters (e.g., scattering process, relaxation mechanism, etc.) in metallic and semiconducting systems [2]. The quantitative level of understanding of MC for disordered systems by using the localization-interaction model is rather useful for checking the appropriateness... 

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