Determination of the binding energies of shallow acceptors from photoluminescence excitation spectra for donor-acceptor pairs in ZnTe

Abstract

We have measured the photoluminescence excitation spectra for the donor-acceptor pairs with long d-a distance in ZnTe. The binding energies of As, P, and Li acceptors have been estimated from the low-energy limit of threshold energies for the excitation bands. The determined values are 73.5, 60.5, and 58.3 meV for As, P, and Li acceptors, respectively. The present method of determining binding energies is compared with other methods.