Topic
Van der Pauw method
About: Van der Pauw method is a research topic. Over the lifetime, 1682 publications have been published within this topic receiving 25364 citations.
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TL;DR: In this paper, the current and Hall terminals of an Al 0.3 Ga 0.7 As/GaAs heterostructure Van der Pauw element show the pure 1/f noise characteristics without any generation-recombination noise.
Abstract: Both the current and Hall terminals of an Al 0.3 Ga 0.7 As/ GaAs heterostructure Van der Pauw element show the pure 1/f noise characteristics without any generation-recombination noise with a difference of 17 dBV/√Hz between them. The noise level across the Hall terminals is equal to that of the thermal noise at about 1 kHz, and the minimum magnetic field is estimated from the Hall terminal noise and the maximum magnetic field sensitivity as about 2 nT.
10 citations
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TL;DR: In this article, Cadmium chloride and thiourea were used as Cd and S ion suppliers, respectively, for growing CdS films on glass substrates by the chemical-bath deposition (CBD) technique.
Abstract: CdS films were grown onto glass substrates by the chemical-bath deposition (CBD) technique using cadmium chloride and thiourea as Cd and S ion suppliers, respectively. The growth process was carried out with and without constant magnetic field applications. The field was applied per-pendicular to the substrate at two values of the magnetic induction: 0.040 and 0.077 T. As result of the application of the magnetic field during the growth process, changes in dark conductivity and carrier concentration were observed, added to the evolution of native defect energy levels, evidenced from van der Pauw and Hall effects versus temperature data, and thermally stimulated current measurements respectively. In particular, the electrical properties of the CBD-CdS films become enhanced by field application.
10 citations
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TL;DR: In this article, single crystals of p−Hc1−xCdxTe (x=0.16) were grown by the Bridgeman technique and irradiated with laser pulse of various energy densities.
Abstract: Single crystals of p‐Hc1−xCdxTe (x=0.16) were grown by the Bridgeman technique. The bulk single crystals were irradiated with laser pulse of various energy densities. A pulsed laser (Nd:YAG) capable of producing 10‐ns pulses of 0.53 μm wavelength (frequency doubled) with varying energy densities (2–50 mJ/cm2) was employed. dc conductivity and Hall coefficient measurements were made on the single crystal using the Van der Pauw technique in the temperature range 77–300 K for both as‐grown and laser‐irradiated samples. Also the x‐ray diffraction pattern and transmission measurements of the samples were taken at room temperature. Electrical studies shows that the p‐mercury cadmium telluride after the laser irradiation becomes n type and optical results show that the free‐carrier concentration after laser irradiation increases sharply so that there is negligibly small transmission. The x‐ray studies show that single crystal p‐type samples after laser irradiation undergo structural changes as well, introducing ...
10 citations
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10 citations
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TL;DR: In this article, the effects of different Cu concentration on the crystal structure, surface morphology, optical properties and electrical properties were investigated by using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive Xray spectroscopy (EDX), ultraviolet-visible (UV-VIS) spectrophotometer and Hall measurement with four-point Van der Pauw configuration respectively.
10 citations