Journal of Theoretical and Applied Physics (JTAP) Investigation of dopant centres dominating the conduction process in the bulk of un-doped GaSb Volume 13, 2019 Issue 4, November and December 2019 2023 11 17 Investigation of dopant centres dominating the conduction process in the bulk of un-doped GaSb 10.1007/s40094-019-00355-3 EN Megersa Wodajo Shura Department of Applied Physics, Adama Science and Technology University (ASTU), P. O. Box 1888, Adama, Ethiopia 0000-0001-7800-0789 Journal Article 2023 11 17 AbstractIn this paper, first, the theoretical description of the effects of the dopant densities and the activation energies on the ionization densities, the chemical potentials corresponding to each dopant levels, the majority carrier densities and the Fermi-energy levels in one-acceptor-level system, highly compensated system and two-acceptor-level system are described in detail. Upon fitting the theoretical to the experimental results obtained by the temperature-dependent Hall effect measurements for three samples of un-doped GaSb, the dopant densities and the activation energies for a system with different dopants are investigated. The obtained results revealed that the dopant activation energy has less (no) effect on the Fermi-energy level and the majority carrier density in the highest temperature regimes. The doping density has also less (no) effect on the Fermi-energy level in the lowest temperature regimes. Finally, fitting of the theoretical to the experimental Hall effect measurements results confirmed the presence of three acceptor and one donor levels dominating the majority carrier densities at different temperature regions in all the samples of un-doped GaSb semiconductor.