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KMID : 1151820100040010005
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Journal of the Korean Society of Radiology
2010 Volume.4 No. 1 p.5 ~ p.9
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Analysis of Signal Properties in accordance with electrode area of x-ray conversion material
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Jeon Sung-Pyo
Kim S.-H.
Cho Gyu-Seok
Jung Suk-Hee
Park Ji-Koon
Kang Sang-Sik
Han Yong-Hee
Kim Kang-Soo
Mun Chi-Woong
Nam Sang-Hee
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Abstract
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In recent, a digital x-ray detector attracted worldwide attention and there are many studies to commercialize. There are two methods in digital x-ray detector. This method is an Indirect method and Direct method. This study is to see the differences between the digital x-ray detector based on a-Se used in the existing indirect conversion method and an x-ray conversion material that has better SNR(Signal-to-noise ratio) and property than the a-Se. To solve the problem that is difficult to make a large area film using Screen-Print method, we used a Screen-Print method. In this study, we used a polyclystal HgI₂ as x-ray conversion material and a sample thickness is 150㎛ and an area is 3㎝×3㎝. ITO(Indium-Tin-Oxide) electrode was used as top electrode using a Magnetron Sputtering System and each area is 3㎝×3㎝, 2㎝×2㎝ and 1㎝×1㎝ and then we evaluated darkcurrent, sensitivity and SNR of the HgI₂ film are measured, then we evaluated the electrical properties. And we used a current integration mode when I-V test. This experiment shows that the sensitivity increases in accordance with the area of the electrode but the SNR is decreased because of the high darkcurrent. Through fabricating of various thicknesses and optimal electrodes, we will optimize SNR in the future work.
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KEYWORD
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HgI2, Sensitivity, darkcurrent, SNR, PIB
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