Analysis of dislocations and their correlation with dark currents in CdTe/Si heterojunction diode-type x-ray detectors

2021 ◽  
Vol 130 (5) ◽  
pp. 055302
Author(s):  
B. S. Chaudhari ◽  
H. Goto ◽  
M. Niraula ◽  
K. Yasuda
Author(s):  
Yunlong Li ◽  
Emmanuel Adeagbo ◽  
Cyril Koughia ◽  
Blaine Simonson ◽  
Richard Pettipas ◽  
...  

Direct conversion x-ray image detectors offer higher spatial resolution than their indirect counterparts. Organic-inorganic hybrid perovskites are among the most sensitive x-ray photoconductors for these detectors; however, high dark currents...


1993 ◽  
Vol 302 ◽  
Author(s):  
H. N. Jayatirtha ◽  
M. Azoulay ◽  
M.A. George ◽  
A. Burger

ABSTRACTThe surface modifications that occur on °-mercuric iodide surfaces during the fabrication process are crucial for the development of a low noise, high resolution X-ray spectrometer. In this study, we discuss the effects of surface treatments on the dark currents and the results are correlated with surface morphology studies that were carried out by the atomic force microscopy (AFM) technique.


2019 ◽  
Vol 31 (19) ◽  
pp. 1596-1599 ◽  
Author(s):  
Leidang Zhou ◽  
Shuwen Guo ◽  
Xiaolong Zhao ◽  
Yongning He ◽  
Liang Chen ◽  
...  
Keyword(s):  

1973 ◽  
Vol 17 ◽  
pp. 531-541
Author(s):  
Jacque J. Hohlfelder

AbstractPlanar, Silicon diodes have been calibrated in the energy region 1.8 to 5.0 keV using low-energy, continuous-mode x rays. The spectral energy distribution of each of six x-ray spectra used in the calibration was measured using a non-dispersive Si(Li) x-ray spectrometer. X-ray spectral fluxes were measured using a xenon-filled, parallel-plate ionization chamber. A chopper-wheel and phase-sensitive detector combination was used to enhance the signal- to-noise of the silicon diode signals in order to measure the x-ray induced diode currents, ∼10-10) A., in the presence of diode dark currents of order, 10-5 A. Measured data were consistent with diode silicon dead layers of from 0.3 to 0.4 μm. Average agreement to within five percent was found between measured diode sensitivities and calculated diode sensitivities. The measured diode x-ray sensitivities are compared with independently-measured diode x-ray sensitivities of similar diodes.


1994 ◽  
Vol 144 ◽  
pp. 275-277
Author(s):  
M. Karlický ◽  
J. C. Hénoux

AbstractUsing a new ID hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations include the effects of the return-current that reduces significantly the depth of the chromospheric layer which is evaporated. The present modelling is made with superthermal electron parameters corresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109erg cm−2s−1. It was found that due to the electron bombardment the two chromospheric evaporation waves are generated at both feet of the loop and they propagate up to the top, where they collide and cause temporary density and hard X-ray enhancements.


1994 ◽  
Vol 144 ◽  
pp. 1-9
Author(s):  
A. H. Gabriel

The development of the physics of the solar atmosphere during the last 50 years has been greatly influenced by the increasing capability of observations made from space. Access to images and spectra of the hotter plasma in the UV, XUV and X-ray regions provided a major advance over the few coronal forbidden lines seen in the visible and enabled the cooler chromospheric and photospheric plasma to be seen in its proper perspective, as part of a total system. In this way space observations have stimulated new and important advances, not only in space but also in ground-based observations and theoretical modelling, so that today we find a well-balanced harmony between the three techniques.


1994 ◽  
Vol 144 ◽  
pp. 82
Author(s):  
E. Hildner

AbstractOver the last twenty years, orbiting coronagraphs have vastly increased the amount of observational material for the whitelight corona. Spanning almost two solar cycles, and augmented by ground-based K-coronameter, emission-line, and eclipse observations, these data allow us to assess,inter alia: the typical and atypical behavior of the corona; how the corona evolves on time scales from minutes to a decade; and (in some respects) the relation between photospheric, coronal, and interplanetary features. This talk will review recent results on these three topics. A remark or two will attempt to relate the whitelight corona between 1.5 and 6 R⊙to the corona seen at lower altitudes in soft X-rays (e.g., with Yohkoh). The whitelight emission depends only on integrated electron density independent of temperature, whereas the soft X-ray emission depends upon the integral of electron density squared times a temperature function. The properties of coronal mass ejections (CMEs) will be reviewed briefly and their relationships to other solar and interplanetary phenomena will be noted.


1988 ◽  
Vol 102 ◽  
pp. 47-50
Author(s):  
K. Masai ◽  
S. Hayakawa ◽  
F. Nagase

AbstractEmission mechanisms of the iron Kα-lines in X-ray binaries are discussed in relation with the characteristic temperature Txof continuum radiation thereof. The 6.7 keV line is ascribed to radiative recombination followed by cascades in a corona of ∼ 100 eV formed above the accretion disk. This mechanism is attained for Tx≲ 10 keV as observed for low mass X-ray binaries. The 6.4 keV line observed for binary X-ray pulsars with Tx> 10 keV is likely due to fluorescence outside the He II ionization front.


1988 ◽  
Vol 102 ◽  
pp. 357-360
Author(s):  
J.C. Gauthier ◽  
J.P. Geindre ◽  
P. Monier ◽  
C. Chenais-Popovics ◽  
N. Tragin ◽  
...  

AbstractIn order to achieve a nickel-like X ray laser scheme we need a tool to determine the parameters which characterise the high-Z plasma. The aim of this work is to study gold laser plasmas and to compare experimental results to a collisional-radiative model which describes nickel-like ions. The electronic temperature and density are measured by the emission of an aluminium tracer. They are compared to the predictions of the nickel-like model for pure gold. The results show that the density and temperature can be estimated in a pure gold plasma.


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