Dislocation States and Deformation-Induced Point Defects in Plastically Deformed Germanium
We used the DLTS and photoluminescence (PL) techniques to study the deep states due to dislocations and deformation-induced point defects (PDs) in plastically deformed p-type germanium single crystals containing predominantly 60 dislocations with density ND, ranging from 105 to 106 cm-2. The narrow line near the temperature 140K dominates in the DLTS spectra. The ionization enthalpy and the capture cross section for holes traps indicate that the substitution copper atoms Cus are the main type of PDs. A decrease of the Cus atoms concentration and redistribution of the intensity in the PL spectra after the heat treatment of deformed samples at a temperature 500 °C are attributed to the diffusion of copper atoms to dislocations resulting in the appearance of “dirty” regular segments of 60 dislocations.
M. Kittler and H. Richter
S. Shevchenko and A.N. Tereshchenko, "Dislocation States and Deformation-Induced Point Defects in Plastically Deformed Germanium", Solid State Phenomena, Vols. 156-158, pp. 289-294, 2010