Wet chemical treatments of high purity Ge crystals for γ-ray detectors: Surface structure, passivation capabilities and air stability

New Developments in HPGe Detectors for High Resolution Detection

“…In the frame of this research, several passivation routes have been proposed and studied also by our group for HPGe detector developments [15][16][17][18][19][20][21].…”

“…Several surface treatments have been characterized and the chemical composition of the newly formed monolayers has been investigated with regards to the nature of chemical bonding with Ge atop atoms by using Fourier Transform Infrared Spectrometry (FTIR) and X-ray Photoelectron Spectroscopy (XPS) in order to investigate, for example, the formation of Ge-H chemical bonds and the stability of each surface after air exposure [18]. Figure 1 shows the XPS spectra of the differently passivated Ge surfaces: for each sample, the Ge2p peak is simulated by using a different peak deconvolution, which highlights the formation of surface bonds of Ge atoms with hydrogen, oxygen or sulphur depending on the treatment.…”

“…For all these methods, we have obtained good insulating properties under the application of high reverse voltage [18] and with the most promising candidates, we have developed the HPGe detectors that will be treated in the next section.…”

“…XPS spectra of Ge2p peak, with corresponding peak deconvolution, for some of the wet treatments of the Ge surface cited in Ref[18]: methanol (Ge_QM), sulphur (Ge_S) the H-terminated (Ge_H10) and the Bidistilled Water Quenched (Ge_QW) passivations.…”

A flexible and miniaturized hair dye based photodetector via chemiluminescence pathway

“…Naderi and Hashim, 2012;Carturan et al, 2015;Li et al, 2014., Mohite andRajpure, 2014;Lv et al, 2013;Song et al, 2015;Kim and Lee, 2013;Masouleh et al, 2015) Flexibility is crucial for electronic device integration and has major implications. In devices, concave and convex bending modes allow access to some otherwise unachievable performance properties.…”