Chen Hualong, Kuklin Artem, Xiao Jing, Al-Hartomy Omar A, Al-Ghamdi Ahmed, Wageh Swelm, Zhang Yule, Ågren Hans, Gao Lingfeng, Zhang Han
Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, China.
Department of Physics and Astronomy, Uppsala University, Uppsala, SE-75120, Sweden.
Small. 2023 Nov;19(46):e2302760. doi: 10.1002/smll.202302760. Epub 2023 Jul 19.
Insight into fundamental light-matter interaction as well as underlying photo-physical processes is crucial for the development of novel optoelectronic devices. Palladium diselenide (PdSe ), an important representative of emerging 2D noble metal dichalcogenides, has gain considerable attention owing to its unique optical, physical, and chemical properties. In this study, 2D PdSe nanosheets (NSs) are prepared using the liquid-phase exfoliation method. A broadband carrier relaxation dynamics from visible to near-infrared bands are revealed using a time-resolved transient absorption spectrometer, giving results that indicate band filling and bandgap renormalization (BGR) effects in the 2D PdSe NSs. The observed blue-shift of the transient absorption spectra at the primary stage and the subsequent red-shift can be ascribed to this BGR effect. These findings reveal the many-body character of the 2D TMDs material and may hold keys for applications in the field of optoelectronics and ultrafast photonics.
深入了解基本的光与物质相互作用以及潜在的光物理过程对于新型光电器件的开发至关重要。二硒化钯（PdSe₂）是新兴的二维贵金属二硫属化物的重要代表，因其独特的光学、物理和化学性质而备受关注。在本研究中，采用液相剥离法制备了二维PdSe₂纳米片（NSs）。使用时间分辨瞬态吸收光谱仪揭示了从可见光到近红外波段的宽带载流子弛豫动力学，结果表明二维PdSe₂纳米片中存在能带填充和带隙重整化（BGR）效应。在初始阶段观察到的瞬态吸收光谱的蓝移以及随后的红移可归因于这种BGR效应。这些发现揭示了二维过渡金属二硫属化物材料的多体特性，并可能为光电子学和超快光子学领域的应用提供关键。
