Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3421541
Keywords
graphene; high-speed optical techniques; hot carriers; thin films
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Funding
- U.S. National Science Foundation [DMR-0954486, EPS-0903806]
- State of Kansas through Kansas Technology Enterprise Corporation
- NRF-CRP Graphene Related Materials and Devices [R-143-000-360-281]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0954486] Funding Source: National Science Foundation
- Office of Integrative Activities
- Office Of The Director [903806] Funding Source: National Science Foundation
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The dynamics of photocarriers in reduced graphene oxide thin films is studied by using ultrafast pump-probe spectroscopy. Time dependent differential transmissions are measured with sample temperatures ranging from 9 to 300 K. At each sample temperature and probe delay, the sign of the differential transmission remains positive. A fast energy relaxation of hot carriers is observed, and is found to be independent of sample temperature. Our experiments show that the carrier dynamics in reduced graphene oxide is similar to other types of graphene, and that the differential transmission is caused by phase-state filling effects of carriers.
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