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High‐purity GaAs layers which are nearly or fully depleted of carriers at low temperatures, due to surface and interface depletion effects, can be characterized electrically by utilizing the phenomenon of persistent photoconductivity. To facilitate electrical measurements of such layers, at 4.2...
The Cs/GaAs(100) system is studied by Auger electron spectroscopy, electron energy‐loss spectroscopy, work function change measurements, low‐energy electron diffraction, and thermal desorption spectroscopy at 200 K and at room temperature. At room temperature the Cs layer is nonmetallic; at...
We have studied the crystalline and optical properties of Al y In 1− y As ternary alloys grown by molecular beam epitaxy on InP substrates. We obtain Al 0.48 In 0.52 As layers with both high structural quality and excellent optical performance by growing (i) at high substrate temperature (600...
Pinch formation in fiber pinch experiments has been investigated in the lower terawatt regime. The main results are: (1) there are upper limits of breakdown voltage (∼700 kV) and current rise rate (∼20 kA/ns) beyond which leak discharges develop within the vacuum feed of the pulseline KALIF;...
Evolution with thickness of the structure of the polycrystalline silicon (poly‐Si) films prepared at 300 °C has been studied by plasma decomposition of SiF 4 /SiH 4 /H 2 source gases. The poly‐Si films with varied thickness are characterized mainly by Raman spectroscopy, x‐ray diffraction...
The bcc phase of Fe‐Mn alloys was studied by means of the Mössbauer effect, x‐ray diffraction, thermogravimetry analysis, and magnetization measurements for Mn concent‐ rations up to 17.5 at.%. These alloys are disordered over this composition range and both the average hyperfine field and...
We present a numerical investigation of all‐optical switching of solitons in two‐ and three‐core nonlinear fiber couplers. Both self‐switching of solitons and phase‐sensitive switching are considered. The extension of the results to multicore couplers is briefly discussed.
Numerical simulations are presented of the potential distribution and current transport associated with metal‐semiconductor (MS) contacts in which the Schottky barrier height (SBH) varies spatially. It is shown that the current across the MS contact may be greatly influenced by the existence of...
Cadmium telluride is a promising thin‐film photovoltaic material as shown by the more than 10% efficient CdS/CdTe heterojunction solar cells. In this work, thin‐film CdS/CdTe solar cells have been prepared using CdS films grown from an aqueous solution and p ‐CdTe films deposited by...
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