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- W4381377211 abstract "Direct growth of large-area uniform graphene films on insulating materials could facilitate the applications of graphene in optoelectronic devices. The ultrafast photocarrier relaxation and saturable absorption of direct chemical vapor deposition-grown graphene glasses, with lots of defects, are studied by using femtosecond time-resolved pump–probe and Z-scan techniques at 800[Formula: see text]nm. We find that both the relaxation times associated with hot carrier cooling and the hot phonon effect are greatly suppressed in these defect-rich graphene glasses, which further leads to the increase of both saturation intensity and anisotropy in transient optical response for graphene glasses as compared with defect-free graphene. And, both the suppression effect and saturation intensity increase with the thickness of graphene film. The dominance of defect-assisted carrier-acoustic phonon scattering (i.e., supercollision, the collision of a carrier with both an acoustic phonon and defects) in the cooling process of hot carriers is responsible for the suppression of relaxation time." @default.
- W4381377211 created "2023-06-21" @default.
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- W4381377211 date "2023-07-26" @default.
- W4381377211 modified "2023-10-15" @default.
- W4381377211 title "Photocarrier relaxation and saturable absorption in defect-rich, direct chemical vapor deposition-grown graphene glass" @default.
- W4381377211 doi "https://doi.org/10.1142/s0218863523400039" @default.
- W4381377211 hasPublicationYear "2023" @default.
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