Characterization of a-Se(As:Cl) Film for Phosphor Coupled X-Ray Light Modulators

Sang Sik Kang; Ji Koon Park; Byung Youl Cha; Jung Woog Shin; So Yeong Kim; Chi Woong Mun; Kun Hwan Lee; Hyung Won Lee; Sang Hee Nam

doi:10.4028/www.scientific.net/SSP.124-126.1677

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Mechanical Strength and Microstructural Characterization of SUS304 Brazed Joints with BNi-2 Filler Metal: Influence of Brazing Temperature and Time
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Characterization of a-Se(As:Cl) Film for Phosphor Coupled X-Ray Light Modulators
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HomeSolid State PhenomenaSolid State Phenomena Vols. 124-126Characterization of a-Se(As:Cl) Film for Phosphor...

Characterization of a-Se(As:Cl) Film for Phosphor Coupled X-Ray Light Modulators

Abstract:

Amorphous selenium (a-Se) film has the potential to fulfill the requirements of a novel x-ray image detector because of its good photo-to-dark impedance ratio, large area coverage, and low temperature deposition. In this work were studied the structural, optical and electrical properties of thermally- evaporated a-Se film for the phosphor-light modulator (PLM). From the x-ray diffraction and electron microscopy experimental results, the deposited film had an amorphous phase without any re-crystallization or defects. Also, the light absorption in widely visible range of 400 ~ 630 nm was over 95 %. From the electrical measurements, the low dark current density of 2.8 nA/cm2 was obtained at 10 V/㎛. The x-ray sensitivity of the 270㎛-Gd2O3:Eu phosphor coupled 20㎛-Se film was 7.31 nC/cm2-mR. From such experimental results, the novel x-ray detector which incorporates phosphor 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.

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Periodical:

Solid State Phenomena (Volumes 124-126)

Pages:

1677-1680

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.124-126.1677

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Online since:

June 2007

Authors:

Sang Sik Kang, Ji Koon Park, Byung Youl Cha, Jung Woog Shin, So Yeong Kim, Chi Woong Mun, Kun Hwan Lee, Hyung Won Lee, Sang Hee Nam

Keywords:

Amorphous Selenium, Liquid Crystal, Phosphor-Light Modulator, X-Ray Detector

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