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Investigation of electrical contacts for Cd1-xZnx Te nuclear radiation detector

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10 Author(s)
Burger, A. ; Dept. of Phys., Fisk Univ., Nashville, TN, USA ; Chen, H. ; Tong, J. ; Shi, D.
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A comparative study of four different metal deposition methods on detector grade Cd1-xZnxTe crystal has been done using current-voltage (I-V) characterization and 133Ba gamma spectroscopy. An electroless Au contact and thermal evaporated Au contact have been found to yield a smaller leakage current and a more linear/symmetric I-V curve than that of sputtered Pt and Au contact. An optimum detector performance can be achieved by combining the thermal evaporated Au deposition method with a chemical surface treatment consisting of 5% Br MeOH followed by 2% Br-20% lactic acid in ethylene glycol. Low temperature photoluminescence spectra of Cd1-xZn xTe samples corresponding to these different metallization schemes are also presented and discussed

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Nuclear Science, IEEE Transactions on  (Volume:44 ,  Issue: 3 )