Coulometric determination of arsenic in gallium arsenide crystal wafers The determination of small variations in the stoichiometry of undoped, semi-insulating gallium arsenide can be achieved by using constant current coulometry. Samples taken from a wafer are etched in HF, dissolved in NaOH-peroxide solution, then treated with a citric acid buffer. [...]
Gas filled prototype of a CdZnTe pixel detector CdZnTe pixel structures are currently the most promising detectors for the focal planes of hard X-ray telescopes, for astronomical observation in the range 5–100 keV. In Sharma et al. (Proc. SPIE 3765 (1999) 822) and Ramsey et al. (Nucl. Instrum. Methods A 458 [...]
Study on the mechanism of using IR illumination to improve the carrier transport performance of CdZnTe detector Different wavelength IR light (770–1150 nm) was used to evaluate the effect of IR light on the carrier transport performance of CdZnTe detector. The effective mobility-lifetime product (μτ*) of CdZnTe achieved 10−2 cm2 [...]
Fabrication of GaN wafers for electronic and optoelectronic devices The fabrication of GaN wafers from GaN boules (ingots) is described. Gallium nitride boules were grown by hydride vapor phase epitaxy and sliced and sized into wafer blanks. The GaN wafer blanks were lapped and polished. The gallium-side of the wafer [...]
Experimental and theoretical investigation of phosphorus in-situ doping of germanium epitaxial layers We investigate phosphorus in-situ doping characteristics in germanium (Ge) during epitaxial growth by spreading resistance profiling analysis. In addition, we present an accurate model for the kinetics of the diffusion in the in-situ process, modeling combined growth and [...]
Optical and electronic simulation of gallium arsenide/silicon tandem four terminal solar cells A tandem solar cell in a mechanical (stack like) arrangement of gallium arsenide and silicon solar cells is evaluated as a pathway towards higher efficiency terrestrial solar cells. In this work the technical feasibility of the tandem solar [...]
Effects of mosaic structure on the physical properties of CdZnTe crystals Mosaic structure in CdZnTe crystals was identified by using scanning electron microscopy (SEM), then the effects of mosaic structure on the physical properties were studied by means of high resolution X-ray diffraction (HRXRD), I–V characterization, and Fourier transform infrared (FT-IR) measurements. [...]
Chemical solution deposition is a low-temperature and possibly the lowest-cost method of growing ZnO nanorods on a GaN substrate. However, most reported methods leave an interface layer between the grown ZnO nanorods and substrate, which can interfere with light emission and extraction. Here we report the growth of high-quality, [...]
Several types of GaN MOSFETs with normally-off operation have been fabricated on insulating substrate and evaluated. In recessed-gate GaN MOSFET, the threshold voltage (Vth) can be easily controlled, but the current drivability is modest and needs to be improved by adopting appropriate device structure and/or process. We achieved enhanced [...]
The photoluminescent germanium nanocrystals (Ge-NCs) were successfully incorporated into electrospun polymeric nanofiber matrix in order to develop photoluminescent nanofibrous composite web. In the first step, the synthesis of Ge-NCs was achieved by nanosecond pulsed laser ablation of bulk germanium wafer immersed in organic liquid. The size, the structural and the chemical [...]
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