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Probing the charge carrier dynamics in semiconductor nanowires with pico- and femtosecond time-resolved optical spectroscopy

Kolloquium der Abteilung 2

 

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.