Probing the charge carrier dynamics in semiconductor nanowires with pico- and femtosecond time-resolved optical spectroscopy
Semiconductor nanowires represent a particularly interesting platform
for the design and fabrication of nanoscale inorganic and hybrid devices
with applications in optoelectronics and sensing. Time-resolved
micro-photoluminescence spectroscopy (TRPL) and two-color femtosecond
pump-probe spectroscopy are powerful tools to investigate the dynamics
of electronic excitations in complex nanowire structures. We will
discuss the charge-carrier dynamics in bare inorganic as well as hybrid
nanowire structures based on the ZnO and GaN material systems. In
particular, we will analyze the dynamics of amplified spontaneous
emission and gain in ZnO nanowires and the dynamics of photo-excited
electron-hole pairs in GaN-based 3D-LED structures.