Probing photoexcited free carrier dynamics of two-dimensional MXene, Nb2C, using ultrafast terahertz spectroscopy

Andrew M. Fitzgerald; Erika Colin-Ulloa; Javery A. Mann; Kiana Montezari; Michel W. Barsoum; Lyubov V. Titova

doi:10.1117/12.2650359

15 March 2023 Probing photoexcited free carrier dynamics of two-dimensional MXene, Nb₂C, using ultrafast terahertz spectroscopy

Andrew M. Fitzgerald, Erika Colin-Ulloa, Javery A. Mann, Kiana Montezari, Michel W. Barsoum, Lyubov V. Titova

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Proceedings Volume 12419, Ultrafast Phenomena and Nanophotonics XXVII; 124190K (2023) https://doi.org/10.1117/12.2650359
Event: SPIE OPTO, 2023, San Francisco, California, United States

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Abstract

Discovered in 2013, 2D niobium carbide (Nb₂C), a member of the MXene family, has been shown to have many extraordinary properties, such as high photothermal conversion efficiency, strong electron-phonon interactions, strong optical absorption in the near-infrared, and even saturable optical absorption. These unique properties of Nb₂C render this MXene potentially useful for a variety of applications, including photonic and optoelectronic devices and even photothermal cancer therapy. Here, we employ both terahertz time-domain spectroscopy (TDS) and time-resolved terahertz spectroscopy (TRTS) to investigate intrinsic and photoinduced conductivity and dynamics of optically injected charge carriers with 1.55 eV excitations in order to understand the photoinduced processes taking place in Nb₂C. We find that the photoinduced conductivity in this MXene shows an initial rapid decay over a picosecond time scale, followed by a much longer-lived component that lasts for nanoseconds. We also observe that the long-range conductivity is strongly limited by the nanoflake boundaries.

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Andrew M. Fitzgerald, Erika Colin-Ulloa, Javery A. Mann, Kiana Montezari, Michel W. Barsoum, and Lyubov V. Titova "Probing photoexcited free carrier dynamics of two-dimensional MXene, Nb₂C, using ultrafast terahertz spectroscopy", Proc. SPIE 12419, Ultrafast Phenomena and Nanophotonics XXVII, 124190K (15 March 2023); https://doi.org/10.1117/12.2650359

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