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KMID : 0364920090340020065
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Journal of Radiation Protection and Research
2009 Volume.34 No. 2 p.65 ~ p.68
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EFFECT OF METAL CONTACT ON THE CZT DETECTOR PERFORMANCE
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Park Se-Hwan
Park Hyung-Sik
Lee Jae-Hyung
Kim Han-Soo
Ha Jang-Ho
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Abstract
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Metal-semiconductor contact is very important for the operating property of semiconductor detector. Te semiconductor crystal was grown with Bridgman method, and the crystal was cut and polished. EPMA (Electron Probe Micro Analyzer) and ICP-MS (Inductively Coupled Plasma Mass Spectrometry) analysis were done to obtain the chemical composition and impurity of the crystal. Metal contact was deposited with thermal evaporator on both sides of the crystal. Detectors with Au/CZT/Au and In/CZT/Au structure were made, and I-V curve and the energy spectrum were measured with the detectors. It could be seen that the detector with the In/CZT/Au structure has superior property than the detector with Au/CZT/Au structure when the crystal resistivity was low. However, the metal contact structure effect becomes low when the crystal resistivity was high.
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KEYWORD
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Metal-semiconductor Contact, CZT Detector, Bridgman Method, I-V Curve, Energy Spectrum
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