Spatial-Temporal Imaging of Anisotropic Photocarrier Dynamics in Black Phosphorus

Nano Letters
Bolin LiaoAhmed H Zewail

Abstract

As an emerging single elemental layered material with a low symmetry in-plane crystal lattice, black phosphorus (BP) has attracted significant research interest owing to its unique electronic and optoelectronic properties, including its widely tunable bandgap, polarization-dependent photoresponse and highly anisotropic in-plane charge transport. Despite extensive study of the steady-state charge transport in BP, there has not been direct characterization and visualization of the hot carriers dynamics in BP immediately after photoexcitation, which is crucial to understanding the performance of BP-based optoelectronic devices. Here we use the newly developed scanning ultrafast electron microscopy (SUEM) to directly visualize the motion of photoexcited hot carriers on the surface of BP in both space and time. We observe highly anisotropic in-plane diffusion of hot holes with a 15 times higher diffusivity along the armchair (x-) direction than that along the zigzag (y-) direction. Our results provide direct evidence of anisotropic hot carrier transport in BP and demonstrate the capability of SUEM to resolve ultrafast hot carrier dynamics in layered two-dimensional materials.

References

Aug 11, 2010·Proceedings of the National Academy of Sciences of the United States of America·Ding-Shyue YangAhmed H Zewail
Jan 29, 2014·Proceedings of the National Academy of Sciences of the United States of America·Jongweon ChoAhmed H Zewail
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Citations

Jun 14, 2018·Nanoscale·Peymon ZereshkiHui Zhao
Aug 22, 2018·Advanced Materials·Jiajie PeiYuerui Lu
Jan 17, 2019·Advanced Materials·Zhaohe DaiZhong Zhang
Apr 10, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·R RosatiT Kuhn
Jun 22, 2021·Nano Letters·Joeson WongHarry A Atwater
Jul 20, 2021·Nano Letters·Hélène SeilerFabio Caruso
Mar 28, 2020·Nano Letters·Daniela ZahnRalph Ernstorfer
Apr 15, 2020·Nano Letters·Junjia WangStéphane Kéna-Cohen
Dec 12, 2018·Nano Letters·Michelle C SherrottHarry A Atwater

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