The steady-state and time-resolved photoluminescence (PL) studies of ZnSxSe1-x epilayers on GaAs substrate grown by molecular beam epitaxy around the lattice matching composition (0 < x < 0.12) are discussed. We have investigated the PL decay dynamics of ZnSxSe1-x epilayers and found that the decay time of the ZnSxSe1-x epilayer with sulfur composition closely lattice-matched with the substrate is longer than that of any other sample. This finding is interpreted as indicating that the defects induced by lattice mismatch act as nonradiative recombination centers and consequently reduce the PL lifetimes of the epilayers. These studies suggest that the lattice mismatch has a strong correlation with PL lifetimes of the ZnSxSe1-x epilayers.
Bibliographical noteFunding Information:
Acknowledgements-This work was partiallys upported by the Ministry of Science and Technology and the Center for Molecular Science through the Korea Sciencea ndE ngineeringF oundation(K OSEF).
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry