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Layer-Tunable Nonlinear Optical Characteristics and Photocarrier Dynamics of 2D PdSe2 in Broadband Spectra
Small ( IF 13.0 ) Pub Date : 2021-10-22 , DOI: 10.1002/smll.202103938 Chenyu Ye 1 , Zhenqi Yang 1 , Junhao Dong 1 , Yongfeng Huang 1 , Miaomiao Song 1 , Baisheng Sa 1 , Jingying Zheng 1 , Hongbing Zhan 1
Small ( IF 13.0 ) Pub Date : 2021-10-22 , DOI: 10.1002/smll.202103938 Chenyu Ye 1 , Zhenqi Yang 1 , Junhao Dong 1 , Yongfeng Huang 1 , Miaomiao Song 1 , Baisheng Sa 1 , Jingying Zheng 1 , Hongbing Zhan 1
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Layered 2D transition metal dichalcogenides (TMDCs) exhibited fascinating nonlinear optical (NLO) properties for constructing varied promising optoelectronics. However, exploring the desired 2D materials with both superior nonlinear absorption and ultrafast response in broadband spectra remain the key challenges to harvest their greatest potential. Here, based on synthesizing 2D PdSe2 films with the controlled layer number, the authors systematically demonstrated the broadband giant NLO performance and ultrafast excited carrier dynamics of this emerging material under femtosecond visible-to-near-infrared laser-pulse excitation (400–1550 nm). Layer-dependent and wavelength-dependent evolution of optical bandgap, nonlinear absorption, and photocarrier dynamics in the obtained 2D PdSe2 are clearly revealed. Specially, the transition from semiconducting to semimetallic PdSe2 induced dramatic changes of their interband absorption–relaxation process. This work makes 2D PdSe2 more competitive for future ultrafast photonics and also opens up a new avenue for the optical performance optimization of various 2D materials by rational design of these materials.
中文翻译：
宽带光谱中二维 PdSe2 的层可调非线性光学特性和光载流子动力学
层状二维过渡金属二硫属化物 (TMDC) 表现出迷人的非线性光学 (NLO) 特性，可用于构建各种有前途的光电子学。然而，探索在宽带光谱中具有卓越非线性吸收和超快响应的所需二维材料仍然是挖掘其最大潜力的关键挑战。在这里，基于合成具有受控层数的2D PdSe 2薄膜，作者系统地展示了这种新兴材料在飞秒可见光至近红外激光脉冲激发（400-1550纳米）。所得二维 PdSe 2中光学带隙、非线性吸收和光载流子动力学的层相关和波长相关演化被清楚地揭示出来。特别是，从半导体到半金属 PdSe 2的转变引起了它们的带间吸收-弛豫过程的巨大变化。这项工作使 2D PdSe 2在未来的超快光子学中更具竞争力，也为通过这些材料的合理设计优化各种 2D 材料的光学性能开辟了新途径。
更新日期：2021-12-16
中文翻译：
宽带光谱中二维 PdSe2 的层可调非线性光学特性和光载流子动力学
层状二维过渡金属二硫属化物 (TMDC) 表现出迷人的非线性光学 (NLO) 特性，可用于构建各种有前途的光电子学。然而，探索在宽带光谱中具有卓越非线性吸收和超快响应的所需二维材料仍然是挖掘其最大潜力的关键挑战。在这里，基于合成具有受控层数的2D PdSe 2薄膜，作者系统地展示了这种新兴材料在飞秒可见光至近红外激光脉冲激发（400-1550纳米）。所得二维 PdSe 2中光学带隙、非线性吸收和光载流子动力学的层相关和波长相关演化被清楚地揭示出来。特别是，从半导体到半金属 PdSe 2的转变引起了它们的带间吸收-弛豫过程的巨大变化。这项工作使 2D PdSe 2在未来的超快光子学中更具竞争力，也为通过这些材料的合理设计优化各种 2D 材料的光学性能开辟了新途径。
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