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KMID : 1151820090030010011
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Journal of the Korean Society of Radiology
2009 Volume.3 No. 1 p.11 ~ p.15
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Radiation detector material development with multi-layer by hetero-junction for the reduction of leakage current
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Oh Kyung-Min
Yoon Min-Seok
Kim Min-Woo
Cho Sung-Ho
Nam Sang-Hee
Park Ji-Koon
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Abstract
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In this study, the basic research verifying possibility of applications as radiology image sensor in Digital Radiography was performed, the radiology image sensor was fabricated using a multi-layer technique to decrease dark current. High efficiency materials in substitution for Amorphous Selenium(a-Se) have been studied as a direct method of imaging detector in Digital Radiography to decrease dark current by using PN junction or Hetero junction already used as solar cell, semiconductor. Particle-In -Binder method is used to fabricate radiology image sensor because it has a lot of advantages such as fabrication convenient, high yield, suitability for large area sensor. But high leakage current is one of main problem in Particle-In -Binder method. To make up for the weak points, multi-layer technique is used, and it is considered that high efficient digital radiation sensor can be fabricated with easy and convenient process. In this study, electrical properties such as leakage current, sensitivity, signal linearity is measured to evaluate multi-layer radiation sensor material.
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KEYWORD
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hetero-junction, multi-layer, Digital Radiography
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