Deposition of contacts is a major issue for the preparation of CdZnTe-based detectors. In particular, due to CdZnTe thermal instability above 150 degree Celsius, thermal annealing of contacts after deposition is not possible. Also for this reason, mechanical stability of contacts is usually poor. In this frame, we have studied mechanical and electrical properties of gold electroless deposited contacts prepared from waterbased and alcoholic solutions. While electrical I-V characteristics are similar in the two cases, showing the typical ???S??? behavior of two diodes in ???back to back??? configuration, contacts prepared from alcoholic solutions show a much better mechanical stability and can overcome a typical adhesive tape test. The contact structure obtained by water-based and alcoholic solutions has been studied by different techniques, such as Scanning Electron Microscopy, Auger spectroscopy, and Transmission Electron Microscopy. The results of the characterization are discussed in order to explain the different mechanical behavior of the contacts prepared according to the two preparation procedures.
Gold Electroless Deposition by Water-Based and Alcoholic Solutions
TAGLIAFERRI, ALBERTO;
2014-01-01
Abstract
Deposition of contacts is a major issue for the preparation of CdZnTe-based detectors. In particular, due to CdZnTe thermal instability above 150 degree Celsius, thermal annealing of contacts after deposition is not possible. Also for this reason, mechanical stability of contacts is usually poor. In this frame, we have studied mechanical and electrical properties of gold electroless deposited contacts prepared from waterbased and alcoholic solutions. While electrical I-V characteristics are similar in the two cases, showing the typical ???S??? behavior of two diodes in ???back to back??? configuration, contacts prepared from alcoholic solutions show a much better mechanical stability and can overcome a typical adhesive tape test. The contact structure obtained by water-based and alcoholic solutions has been studied by different techniques, such as Scanning Electron Microscopy, Auger spectroscopy, and Transmission Electron Microscopy. The results of the characterization are discussed in order to explain the different mechanical behavior of the contacts prepared according to the two preparation procedures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
