Document Type
Article
Original Publication Date
2004
Journal/Book/Conference Title
Physical Review B
Volume
70
Issue
19
DOI of Original Publication
10.1103/PhysRevB.70.195207
Date of Submission
May 2015
Abstract
The optical properties of a high quality bulk ZnO, thermally post treated in a forming gas environment are investigated by temperature dependent continuous wave and time-resolved photoluminescence (PL) measurements. Several bound and free exciton transitions along with their first excited states have been observed at low temperatures, with the main neutral-donor-bound exciton peak at 3.3605 eV having a linewidth of 0.7 meV and dominating the PL spectrum at 10 K. This bound exciton transition was visible only below 150 K, whereas the A-free exciton transition at 3.3771 eV persisted up to room temperature. A-free exciton binding energy of 60 meV is obtained from the position of the excited states of the free excitons. Additional intrinsic and extrinsic fine structures such as polariton, two-electron satellites, donor-acceptor pair transitions, and longitudinal optical-phonon replicas have also been observed and investigated in detail. Time-resolved PL measurements at room temperature reveal a biexponential decay behavior with typical decay constants of similar to170 and similar to864 ps for the as-grown sample. Thermal treatment is observed to increase the carrier lifetimes when performed in a forming gas environment.
Rights
Teke, A., Özgür, Ü., Doğan, S., et al. Excitonic fine structure and recombination dynamics in single-crystalline ZnO. Physical Review B, 70, 195207 (2004). Copyright © 2004 American Physical Society.
Is Part Of
VCU Electrical and Computer Engineering Publications
Comments
Originally published by the American Physical Society at: http://dx.doi.org/10.1103/PhysRevB.70.195207