The ionization energy of acceptors in GaSb has been explored in various studies. For native acceptors, ionization energy typically ranges from 20–40 meV for shallow levels and can reach approximately 120 meV for deeper levels.

For more details, Electronic Materials Letters (DOI: 10.1007/s13391-013-3028-z)

Thank you Dr Prakash Yadav. Although the authors do not give the ionization energy of Ag, the paper is interesting and provides useful information.