1 research outputs found
Exciton Scattering Mechanism in a Single Semiconducting MgZnO Nanorod
Excitonic phenomena, such as excitonic absorption and
emission,
have been used in many photonic and optoelectronic semiconductor device
applications. As the sizes of these nanoscale materials have approached
to exciton diffusion lengths in semiconductors, a fundamental understanding
of exciton transport in semiconductors has become imperative. We present
exciton transport in a single MgZnO nanorod in the spatiotemporal
regime with several nanometer-scale spatial resolution and several
tens of picosecond temporal resolution. This study was performed using
temperature-dependent cathodoluminescence and time-resolved photoluminescence
spectroscopies. The exciton diffusion length in the MgZnO nanorod
decreased from 100 to 70 nm with increasing temperature in the range
of 5 and 80 K. The results obtained for the temperature dependence
of exciton diffusion length and luminescence lifetime revealed that
the dominant exciton scattering mechanism in MgZnO nanorod is exciton–phonon
assisted piezoelectric field scattering