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000207206 1001_ $$0P:(DE-HGF)0$$aBudnitsky, D.$$b0
000207206 1112_ $$a15th International Workshop on Radiation Imaging Detectors$$cParis$$gIWORID2013$$wFrance
000207206 245__ $$aChromium-Compensated GaAs Detector Material and Sensors
000207206 260__ $$aLondon$$bInst. of Physics$$c2014
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000207206 520__ $$aResults obtained from numerical calculations of and experimental studies on the pulse height distribution inherent in ionizing radiation gallium arsenide sensors as a function of the design features of the devices and electrophysical characteristics of the detector material are presented. It is shown that the pulse height distribution is defined by the distribution pattern of the nonequilibrium charge carrier lifetime and by the electric field profile in the bulk of the sensor. Investigations on the detector sensitivity to X-ray energies in the range between 40 and 150 keV were performed. The sensor polarization was found to produce only a marginal effect compensated by an increase in the bias voltage. Prototype pixel sensors measuring 256 × 256 and 512 × 768 pixels with a 55 μm pitch and a 500 μm thick sensitive layer were produced. The dependence of the photocurrent and count rate on the X-ray radiation intensity and bias voltage applied to the sensor was examined. In the 40–80 keV energy range, the maximum count rate amounted to 800 kHz/pixel for a negative sensor bias voltage of 800 V. The sensors are demonstrated to provide spatial resolution varying with the pixel pitch and to enable high-quality X-ray images to be obtained.
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000207206 7001_ $$0P:(DE-HGF)0$$aTyazhev, Anton$$b1$$eCorresponding author
000207206 7001_ $$0P:(DE-HGF)0$$aNovikov, V.$$b2
000207206 7001_ $$0P:(DE-HGF)0$$aZarubin, A.$$b3
000207206 7001_ $$0P:(DE-HGF)0$$aTolbanov, O.$$b4
000207206 7001_ $$0P:(DE-HGF)0$$aSkakunov, M.$$b5
000207206 7001_ $$0P:(DE-HGF)0$$aHamann, E.$$b6
000207206 7001_ $$0P:(DE-HGF)0$$aFauler, A.$$b7
000207206 7001_ $$0P:(DE-HGF)0$$aFiederle, M.$$b8
000207206 7001_ $$0P:(DE-HGF)0$$aProcz, S.$$b9
000207206 7001_ $$0P:(DE-H253)PIP1005340$$aGraafsma, H.$$b10
000207206 7001_ $$0P:(DE-HGF)0$$aRyabkov, S.$$b11
000207206 773__ $$0PERI:(DE-600)2235672-1$$a10.1088/1748-0221/9/07/C07011$$gVol. 9, no. 07, p. C07011 - C07011$$n07$$pC07011$$tJournal of Instrumentation$$v9$$x1748-0221$$y2014
000207206 8564_ $$uhttp://iopscience.iop.org/1748-0221/9/07/C07011/
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000207206 9132_ $$0G:(DE-HGF)POF3-632$$1G:(DE-HGF)POF3-630$$2G:(DE-HGF)POF3-600$$aDE-HGF$$bForschungsbereich Materie$$lMaterie und Technologie$$vDetector technology and systems$$x0
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000207206 9141_ $$y2014
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