Ultrafast dynamics of photoexcitations in 2D Ti3C2Tz, Mo2Ti2C3Tz, and Nb2CTz MXenes
Ultrafast dynamics of photoexcitations in 2D Ti3C2Tz, Mo2Ti2C3Tz, and Nb2CTz MXenes
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DOI：
10.1117/12.2649428
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发表时间：
2023-03
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通讯作者：
Erika Colin-Ulloa;Kiana Montazeri;Varun Natu;Andrew M. Fitzgerald;Ken Ngo;J. Uzarski;M. Barsoum;L. Titova
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作者：
Erika Colin-Ulloa;Kiana Montazeri;Varun Natu;Andrew M. Fitzgerald;Ken Ngo;J. Uzarski;M. Barsoum;L. Titova
MXenes是一类新型的固有金属二维材料。它们广泛的光电特性表明了它们的化学成分在电子和光子器件中的应用。在这项工作中，我们提出了一个全面的研究MXene家族的三个成员，Ti3C2Tz， Mo2Ti2C3Tz和Nb2CTz的光学性质，使用超快瞬态光吸收和太赫兹光谱。我们发现这些特性是自由载流子、带间跃迁和局部表面等离子体共振之间复杂的相互作用的结果。阐明这些新兴材料的光激发性质和载流子动力学将为其光电应用潜力奠定基础。
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, Ti3C2Tz, Mo2Ti2C3Tz, and Nb2CTz, 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.