Method for measuring the seebeck coefficient and electrical conductivity of semiconductors at high temperatures

Conclusions A method for measuring the electrical resistivity and thermo-emf of solids over a wide temperature interval (all the way to the melting point) was described. The attainable measurement error (3% in the Seebeck coefficient and 5% in the electrical resistivity) was ensured by protecting the samples from interaction with the electrode materials, probes, and thermocouples and by considering the errors which appear in the course of measurement of the electric and thermal parameters.Translated from Izmeritel'naya Tekhnika, No. 9, pp. 48–51, September, 1971.     

Analogue of gunn effect in tunneling between quantum wells with different mobilities

The electronic transport in a heterostructure with tunnel-coupled quantum wells (QWs) has been studied numerically under conditions of a strongly non-one-dimensional potential in the structure. Current-voltage (I-V) characteristics, potential distribution, and mobility and density of electrons in QWs have been calculated. The numerical technique is based on a two-dimensional consistent calculation of the quantum and classical regions of the heterostructure. The possibility of the occurrence in heterostructures of this kind of an effect similar to the Gunn effect in a homogeneous semiconductor is demonstrated for the first time. The effect is due to electron tunneling between QWs with different mobilities and is characterized by the formation of a high-electric-field domain and the presence of a region of negative differential resistance in the I-V characteristic.     

Binding energy of Coulomb acceptors in quantum-well systems

The binding energy of a Coulomb acceptor state in a type-I heterostructure with several tunneling-coupled quantum wells is investigated as a function of the positions of the impurity in the structure. It is shown that the specific features of quantum-well hole states strongly influence the binding energy, especially when subbands with negative effective masses arise. Fiz. Tekh. Poluprovodn. 31, 1095–1099 (September 1997)     

Electromass transfer of disperse electrically conducting polymer compositions

We have investigated the change in the morphology and in the characteristics of a layer of soot-filled polyethylene electrodeposited on a substrate as a function of the original composition of the material and the regime of the process.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 57, No. 4, pp. 639–644, October, 1989.     

Identifying the mathematical model of the strength of resistance spot welded joints by measurements

The problem of identification of a mathematical model of the strength of welded joints by measurements is investigated using data obtained in measurements of the parameters of resistance spot welding in the three-factorial measurement experiment.