Besides two well-known dominant peaks, which were earlier correlated with the single monovacancy and gallium interstitial defect, a number of small lines appeared in deep-level transient spectroscopy spectra measured in situ after particle irradiation at low temperatures in p-type germanium. Three of the most pronounced were studied to some detail in the present investigation by combining deep-level transient spectroscopy and high-resolution Laplace deep-level transient spectroscopy. These three lines were called H70, H280 and H290, where the H refers to their hole-trap nature, and the numbers to their apparent enthalpy for hole emission relative to the valence-band edge. The H70 trap was most probably a primary defect, and its observed energy level was found to be an acceptor level. Possible defects related to these deep-level transient spectral lines were considered with special emphasis on the divacancy defect in germanium

Low-Temperature Irradiation-Induced Defects in p-Type Germanium. V.Kolkovsky, M.C.Petersen, A.Mesli, A.Nylandsted Larsen: Physical Review B, 2010, 81[3], 035208