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KMID : 1151820110050020093
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Journal of the Korean Society of Radiology
2011 Volume.5 No. 2 p.93 ~ p.96
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Comparison of Electrical Signal Properties about Top Electrode Size on Photoconductor Film
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Kang Sang-Sik
Joeng Bong-Jae
Noh Si-Cheol
Cho Chang-Hoon
Yoon Ju-Sun
Jeon Sung-Pyo
Park Ji-Koon
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Abstract
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Currently, the development of direct conversion radiation detector using photoconductor materials is progressing in widely. Among of theses photoconductor materials, mercuric iodide compound than amorphous selenium has excellent absorption and sensitivity of high energy radiation. Also, the detection efficiency of signal generated in photoconductor film varies by electric filed and geometric distribution according to top-bottom electrode size. Therefore, in this work, the x-ray detection characteristics are investigated about the size of top electrode in HgI₂ photoconductor film. For sample fabrication, to solve the problem that is difficult to make a large area film, we used the spatial paste screen-print method. And the sample thickness is 150㎛ and an film area size is 3㎝×3㎝ on ITO-coated glass substrate. 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㎝. From experimental measurement, the dark current, sensitivity and SNR of the HgI₂ film are obtained from I-V test. From the experimental results, it shows that the sensitivity increases in accordance with the area of the electrode but the SNR is decreased because of the high dark current. Therefore, the optimized size of electrode is importance for the development of photoconductor based x-ray imaging detector.
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KEYWORD
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detector, sensitivity, dark current, signal to noise, metal electrode
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