journal article·2022-01

Broadband Nonlinear Photoresponse and Ultrafast Carrier Dynamics of 2D PdSe2

Xin Chen, Jiawei Huang, Chenduan Chen, Meiling Chen, Guohang Hu, Hongqiang Wang, Ningning Dong, Jun Wang

Advanced Optical Materials· Volume 10· Issue 1
Publisher page

Abstract

Abstract Palladium diselenide (PdSe2) exhibits considerable potential for application in broadband optoelectronic devices. In this work, the broadband nonlinear optical performance and ultrafast carrier dynamics from ultraviolet to near‐infrared of a trilayer PdSe2 are systematically studied. PdSe2 is found to achieve a giant saturable absorption performance. The modulation depth is 22.47% at 520 nm, whereas the nonsaturable loss and saturation intensity are only 3.83% and 15.47 GW cm−2, respectively, which are better than those of many 2D semiconductors. Based on these findings, a PdSe2‐based visible light thresholder is proposed, its function is to extract an undetectable pulse signal drowned in strong stochastic noise and thereby improve the signal‐to‐noise ratio. Pump–probe technique, along with first‐principles calculation and transient absorption spectra, reveals the intrinsic recombination mechanism, including Auger scattering and trap saturation. This work is expected to establish the foundation for the development of next‐generation PdSe2‐based devices in optoelectronics and visible light communication.
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Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Advanced Fiber Laser Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Laboratory of Micro‐Nano Optoelectronic Materials and Devices Key Laboratory of Materials for High‐Power Laser Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China

Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China

Songshan Lake Materials Laboratory Dongguan 523808 China

Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

Laboratory of Thin Film Optics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China

Key Laboratory of Materials for High Power Laser Chinese Academy of Sciences Shanghai 201800 China

State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China

Center for Excellence in Ultraintense Laser Science Chinese Academy of Sciences Shanghai 201800 China

Funding

National Natural Science Foundation of China · China Postdoctoral Science Foundation

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