Charge-Carrier Separation Dynamics in Photoexcited CdS Nanowires

Understanding the nature of ultrafast charge-carrier dynamics in nanomaterials is important for applications in photocatalysis. We combine time-resolved terahertz spectroscopy (TRTS) and time-resolved photoluminescence (TRPL) measurements to reveal charge-carrier separation in CdS nanowires that occ...

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Bibliographic Details
Published in:	2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) pp. 1 - 2
Main Authors:	Jensen, Charles E., Alam, Kazi M., Palmgren, Anders, Simpson, Howe R. J., Refvik, Nils B., McDowell, Aran J. N., Purschke, David N., Kumar, Navneet, Strilets, Christina, Hernandez, Julieta, Amer, Naaman, Shankar, Karthik, Hegmann, Frank A.
Format:	Conference Proceeding
Language:	English
Published:	IEEE 01-09-2024
Subjects:	cadmium sulfide conductivity Cooling Hot carriers Nanomaterials Nanowires Photocatalysis Photoluminescence semiconductor nanowires Spectroscopy Surface waves ultrafast terahertz spectroscopy
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Summary:	Understanding the nature of ultrafast charge-carrier dynamics in nanomaterials is important for applications in photocatalysis. We combine time-resolved terahertz spectroscopy (TRTS) and time-resolved photoluminescence (TRPL) measurements to reveal charge-carrier separation in CdS nanowires that occurs over timescales on the order of 150 ps. The charge separation time is observed to increase with photoexcitation fluence and is not significantly affected by the specific nanowire growth conditions. Hot carrier cooling times and surface recombination velocities are also extracted from simultaneous fits to the TRTS and TRPL decay dynamics.
ISSN:	2162-2035
DOI:	10.1109/IRMMW-THz60956.2024.10697920