X-ray induced persistent photoconductivity in Si-doped Al0.35Ga0.65As
نویسندگان
چکیده
We demonstrate that x-ray irradiation can be used to induce an insulator–metal transition in Si-doped Al0.35Ga0.65As, a semiconductor with DX centers. The excitation mechanism of the DX centers into their shallow donor state was revealed by studying the photoconductance along with fluorescence. The photoconductance as a function of incident x-ray energy exhibits an edge both at the Ga and As K edge, implying that core–hole excitation of Ga and As are efficient primary steps for the excitation of DX centers. A high quantum yield (@1) suggests that the excitation is indirect and nonlocal, due to secondary electrons, holes, and fluorescence photons. © 2001 American Institute of Physics. @DOI: 10.1063/1.1410894#
منابع مشابه
مشخصهیابی ساختارهای دورآلائیده وارون p-Si/SiGe/Si با روشهای پرتو X و الکتریکی
In this work, the epitaxially grown, lattice–matched p-Si/Si1-xGex/Si inverted remote doped structures have been characterized using X-ray and electrical techniques. The Si cup layer thickness () and Ge content (x) have been determined from computer simulation of intensity and angular sepration of (004) peaks observed in the X-ray diffraction pattern due to misorientaion of corresponding Bragg ...
متن کاملSynthesis and characterization of Gd2O2 S: Tb3+ phosphor powder for X-ray imaging detectors
Gadolinium oxysulfide phosphor doped with trivalent terbium have been synthesized using urea homogenous precipitation and followed by sulfurization at 800 °C under argon atmosphere. Structural and morphological of synthesized phosphor powder were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrometry (FT-IR). Hexagonal structure ...
متن کاملIn Vitro behavior of mechanically activated nanosized Si-Mg-doped fluorapatite
Hydroxyapatite (HA) is perhaps the most attractive material for bone repair, replacement and regeneration, due to its chemical composition and crystallographic structure which are similar to those of natural bone mineral. However, replacement of various elements and compounds in HA, could improve biological properties of this material. The aim of this study was preparation, characterization and...
متن کاملPersistent X-ray photoconductivity and percolation of metallic clusters in charge-ordered manganites
– Charge-ordered manganites of composition Pr1−x(Ca1−ySry)xMnO3 exhibit persistent photoconductivity upon exposure to X-rays. This is not always accompanied by a significant increase in the number of conduction electrons as predicted by conventional models of persistent photoconductivity. An analysis of the X-ray diffraction patterns and current-voltage characteristics shows that X-ray illumina...
متن کامل