Title :
Investigation of electrical contacts for Cd1-xZnx Te nuclear radiation detector
Author :
Burger, A. ; Chen, H. ; Tong, J. ; Shi, D. ; George, M.A. ; Chen, K.T. ; Collins, W.E. ; James, R.B. ; Stahle, C.M. ; Bartlett, L.M.
Author_Institution :
Dept. of Phys., Fisk Univ., Nashville, TN, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
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
Keywords :
II-VI semiconductors; cadmium compounds; electrical contacts; gamma-ray detection; gamma-ray spectrometers; photoluminescence; semiconductor counters; semiconductor device metallisation; surface treatment; zinc compounds; 133Ba gamma spectroscopy; Cd1-xZnxTe nuclear radiation detector; CdZnTe-Ag; chemical surface treatment; current-voltage characteristics; electrical contact; electroless contact; leakage current; metal deposition; metallization; photoluminescence spectrum; sputtered contact; thermal evaporated contact; Chemicals; Contacts; Gamma ray detection; Gamma ray detectors; Gold; Leakage current; Spectroscopy; Surface treatment; Tellurium; Zinc;
Journal_Title :
Nuclear Science, IEEE Transactions on
