Excited Terminal States of a Bound Exciton-Donor Complex in ZnO

The excited terminal states of a bound exciton-donor complex in ZnO have been investigated. Using an electron effective mass of 0.19mₑ, a good theoretical fit to the experimental data was achieved. A donor ionization energy of 0.035 eV was calculated from the effective-mass approximation. Experimentally, the donor ground-state binding energy is 0.052 eV, determined on the assumption that the $n=2$ excited state is effective-mass-like. An electron g value of 1.9₅ and a hole g value of 1.2 were determined for the ground state from Zeeman studies.