Optical properties of ZnO rods formed by metalorganic chemical vapor deposition
B. P. ZhangPhotodynamics Research Center, The Institute of Physical and Chemical Research (RIKEN), 519-1399 Aoba, Aramaki, Aoba-ku, Sendai 980-0845, JapanN. T. BinhPhotodynamics Research Center, The Institute of Physical and Chemical Research (RIKEN), 519-1399 Aoba, Aramaki, Aoba-ku, Sendai 980-0845, JapanYasutomo SegawaPhotodynamics Research Center, The Institute of Physical and Chemical Research (RIKEN), 519-1399 Aoba, Aramaki, Aoba-ku, Sendai 980-0845, JapanK. WakatsukiDepartment of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578, JapanNoritaka UsamiInstitute for Materials Research, Tohoku University, Sendai 980-8577, Japan
2003en
ABI
Abstract
High-quality ZnO rods were formed directly on sapphire (0001) substrates by metalorganic chemical vapor deposition. The rods exhibited free exciton and very sharp bound exciton emissions at low temperatures. By increasing the excitation intensity, biexciton emission was observed. Temperature dependence of the emission spectra suggested that the emission peak at ∼3.315 eV, which had been attributed to neutral acceptor-bound exciton emission, is due to donor-acceptor pairs. The acceptor binding energy was determined to be about 107 meV, which agrees well with that estimated from a hydrogen-atom-like acceptor model.
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