Paper Title:
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.

  Info
Periodical
Solid State Phenomena (Volumes 124-126)
Edited by
Byung Tae Ahn, Hyeongtag Jeon, Bo Young Hur, Kibae Kim and Jong Wan Park
Pages
1677-1680
DOI
10.4028/www.scientific.net/SSP.124-126.1677
Citation
S. S. Kang, J. K. Park, B. Y. Cha, J. W. Shin, S. Y. Kim, C. W. Mun, K. H. Lee, H. W. Lee, S. H. Nam, "Characterization of a-Se(As:Cl) Film for Phosphor Coupled X-Ray Light Modulators", Solid State Phenomena, Vols. 124-126, pp. 1677-1680, 2007
Online since
June 2007
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Price
$32.00
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