Characterisation of defects in rare earth implanted GaN by deep level transient spectroscopy |
| |
Authors: | A Colder P Marie T Wojtowicz P Ruterana S Eimer L Mchin K Lorenz U Wahl E Alves V Matias M Mamor |
| |
Institution: | aSIFCOM, CNRS UMR 6176, 6 boulevard Maréchal Juin, F-14050 Caen Cedex, France;bGREYC, CNRS UMR 6072, 6 boulevard Maréchal Juin, F-14050 Caen Cedex, France;cInstituto Tecnológico e Nuclear, EN10, 2686-953 Sacavém, Portugal;dInstituut voor Kern-en Stralingsfysica, KULeuven, B-3001 Leuven, Belgium |
| |
Abstract: | Deep level transient spectroscopy (DLTS) was used to investigate the electrical properties of GaN implanted with the rare earth (RE) ions erbium and thulium. The GaN layers have been grown by metal-organic chemical vapor deposition (MOCVD) onto (0001) sapphire substrates. We used the channeled implantation geometry to implant a dose of 5×1014 RE cm−2 with an energy of 150 keV. For each species, two different annealing procedures were used in a nitrogen atmosphere for 120 s. Indeed, the annealing temperature plays an important role in the lattice recovery, even if RE-related defects remain present. After annealing at 1000 C, the appearance of two new peaks, for both studied RE ions, is associated with the lattice damage induced by the implantation, such as the presence of nitrogen vacancies. After annealing at 1100 C, the recovery of the lattice is observed while a hole trap appears for both implanted RE ions with corresponding energy values Ev+0.61 eV and Ev+1.59 eV, in the case of Er and Tm, respectively. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|