Photocarrier dynamics at the interface between WS2 and ozone-irradiated graphene (Dataset)
Zhao, Weiwei Lu, Junpeng
Zhao, Weiwei
Lu, Junpeng
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Abstract
We investigate the photocarrier properties of heterostructures (HSs) formed by WS2 and ozone-irradiated graphene (OI-graphene), with a focus on the impact of ozone irradiation. Photoluminescence and Raman spectroscopy reveal a pronounced doping effect induced by ozone irradiation on the graphene layer. Transient absorption measurements demonstrate a substantial suppression of charge transfer efficiency across the interface in the presence of ozone molecules. Spatially resolved pump-probe measurements further show a significant reduction in the diffusion coefficient of photocarriers in WS2 on OI-graphene compared to that of individual WS2 monolayers. The slower diffusion suggests enhanced spatial separation of electrons and holes in the WS2 layer, induced by a built-in electric field at the interface. This effect arises from the combined influences of doping and dielectric property changes caused by ozone molecules. These findings highlight the critical influence of ozone irradiation on graphene and HS interfaces, offering valuable insights for the design of future graphene-based two-dimensional HSs.
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The Excel file contains all original experimental data.
Date
2024-04
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IOP Science
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Keywords
Graphene, Ozone treatment, Photocarriers, Transient absorption