ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Amorphous selenium (a-Se) film has the potential to fulfill the requirements of a novelx-ray image detector because of its good photo-to-dark impedance ratio, large area coverage, and lowtemperature deposition. In this work were studied the structural, optical and electrical properties ofthermally- evaporated a-Se film for the phosphor-light modulator (PLM). From the x-ray diffractionand electron microscopy experimental results, the deposited film had an amorphous phase withoutany re-crystallization or defects. Also, the light absorption in widely visible range of 400 ~ 630 nmwas over 95 %. From the electrical measurements, the low dark current density of 2.8 nA/cm2 wasobtained at 10 V/㎛. The x-ray sensitivity of the 270㎛-Gd2O3:Eu phosphor coupled 20㎛-Se filmwas 7.31 nC/cm2-mR. From such experimental results, the novel x-ray detector which incorporatesphosphor coupled x-ray light modulator, makes an operation at low x-ray exposure possible,therefore, the applications as a medical imaging detector are shown below
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1677.pdf
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