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Zinc Sulfide selenium X-ray Detector for Digital Reaiography
ji-KoonPark,Sang-SikKang,Jae-HyungKim,Chi-WoongMun,Sang-HeeNam 한국전기전자재료학회 2002 Transactions on Electrical and Electronic Material Vol.3 No.4
The high bias voltage associated with the thick layer (typically 500-1000 ㎛) of selenium required to have an acceptable x-ray absorption in radiography and fluoroscopy applications may have some practical inconvenience. A hybrid x-ray detector with zinc sulfide-amorphous selenium structure has been developed to improve the x-ray sensitivity of a a-Se based flat-panel digital imaging detector. Photoluminescence(PL) characteristic of a ZnS:Ag phosphor layer showed a light emission peak centered at about 450 nm, which matches the sensitivity spectrum of selenium. The dark current of the hybrid detector showed similar characteristics with that of a a-Se detector. The x-ray sensitivity of hybrid and a-Se x-ray detector was 345 pC/cm2/mR and 295 pC/cm2/mR at an applied voltage of 10 V/㎛, respectively. The purpose of this study was to evaluate the pertinence of a solution using a thin selenium layer, as a photosensitive converter, with a thick coating of silver doped zinc sulfide phosphor.
Sang-SikKang,Jae-HyungKim,Hyung-Won,Lee,Chi-WoongMun,Sang-HeeNam 한국전기전자재료학회 2002 Transactions on Electrical and Electronic Material Vol.3 No.2
The Cd1-xZnxTe film was fabricated by thermal evaporation for the flat-panel X-ray detector. The stoichimetric ratio and the crystal structure of a polycrystalline Cd1-xZnxTe film were investigated by EPMA and XRD, respectively. The leakage current and X-ray sensitivity of the fabricated films were measured to analyze the X-ray response characteristic of Zn in the polycrystalline CdZnTe thin film. The leakage current and the output charge density of Cd0.7Zn0.3Te thin film were measured to 0.37 nA/cm2 and 260 pC/cm2 at an applied voltage of 2.5 V/㎛, respectively. Experimental results showed that the increase of Zn doping rates in Cd1-xZnxTe detectors reduced the leakage current and improved the signal to noise ratio significantly.