Abstract
MXenes are a new class of intrinsically metallic 2D materials. Their wide range of optoelectronic properties they demonstrate as a function of their chemical composition suggest applications in electronic and photonic devices. In this work we present a comprehensive study of the optical properties of three members of the MXene family, Ti<sub>3</sub>C<sub>2</sub>T<sub>z</sub>, Mo<sub>2</sub>Ti<sub>2</sub>C<sub>3</sub>T<sub>z</sub>, and Nb<sub>2</sub>CT<sub>z</sub>, using ultrafast transient optical absorption and THz spectroscopy. We find that those properties result from a complicated interaction between free carriers, interband transitions and localized surface plasmon resonances. Elucidating the nature of photoexcitation and dynamics of carriers in these emergent materials will lay the foundation for their potential for optoelectronic applications.
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