Abstract
We report the passivation of two deep copper-related acceptor levels in Cu-diffused p-type GaAs by the group-I element lithium. The deep-level- transient-spectroscopy (DLTS) signals of the well-known Cu-related levels with apparent activation energies 0.15 eV and 0.40 eV disappear in Cu-diffused samples when they are diffused with Li, but can be reactivated by annealing. Photoluminescence measurements show a corresponding disappearance and reappearance of the copper-related luminescence at 1.36 eV. Also we observe with DLTS an energy level at EV + 0.32 eV in the Cu-Li-diffused samples. The level is neither present in the Cu-diffused samples before Li diffusion nor in Cu-Li-diffused samples after annealing. As the level is not observed in starting materials or solely Li-diffused samples we suggest that it is related to a Cu-Li complex.
| Original language | English |
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| Pages (from-to) | 1996-1998 |
| Number of pages | 3 |
| Journal | Physical Review B |
| Volume | 50 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1994 |