Chen Hualong, Gao Lingfeng, Al-Hartomy Omar A, Zhang Feng, Al-Ghamdi Ahmed, Guo Jia, Song Yufeng, Wang Zhenhong, Algarni H, Wang Cong, Wageh Swelm, Xu Shixiang, Zhang Han
Institute of Microscale Optoelectronics, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, No. 2318 Yuhangtang Rd., Cangqian, Yuhang District, Hangzhou, 311121, China.
Nanoscale. 2021 Oct 1;13(37):15891-15898. doi: 10.1039/d1nr04224f.
Due to the outstanding electronic properties, unique chemical surface termination units and rich elemental compositions, MXenes have become promising candidates for the development of new generation optoelectronic devices. However, there is still a gap between advanced photonics applications and fundamental understanding of ultrafast carrier photo-physics dynamics and a nonlinear optical response in layered MXenes. Here, we present insight into the excited state relaxation processes and nonlinear optical response of few-layer TiCN and TiC nanosheets (NSs) transient absorption spectroscopy and Z-scan measurements. Owing to similar structural compositions, the transient absorption and nonlinear absorption characteristics behave totally opposite. In addition, photo-induced bandgap renormalization and Pauli blocking phenomena exist in TiC and TiCN NSs, respectively. The element replacement may be a new strategy for tunable carrier kinetics and nonlinear optical response of MXenes. These research studies may provide insight into ultrafast carrier photo-physics dynamics as well as promote MXene-based advanced photonics and their applications in optoelectronic devices.
由于其出色的电子特性、独特的化学表面终止单元和丰富的元素组成，MXenes已成为新一代光电器件开发的有前途的候选材料。然而，在先进光子学应用与对层状MXenes中超快载流子光物理动力学和非线性光学响应的基本理解之间仍存在差距。在此，我们通过瞬态吸收光谱和Z扫描测量，深入了解了少层TiCN和TiC纳米片（NSs）的激发态弛豫过程和非线性光学响应。由于结构组成相似，瞬态吸收和非线性吸收特性表现完全相反。此外，光致带隙重整化和泡利阻塞现象分别存在于TiC和TiCN NSs中。元素替代可能是调节MXenes载流子动力学和非线性光学响应的新策略。这些研究可能会深入了解超快载流子光物理动力学，并促进基于MXene的先进光子学及其在光电器件中的应用。
