Femtosecond pump-probe studies of reduced graphene oxide thin films

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...

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Bibliographic Details
Published in:Applied physics letters 2010-04, Vol.96 (17), p.173106-173106-3
Main Authors: Ruzicka, Brian A., Werake, Lalani K., Zhao, Hui, Wang, Shuai, Loh, Kian Ping
Format: Article
Language:English
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3421541