Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.3573674
Title: Two-probe study of hot carriers in reduced graphene oxide
Authors: Ruzicka, B.A.
Kumar, N.
Wang, S. 
Ping Loh, K. 
Zhao, H.
Issue Date: 15-Apr-2011
Citation: Ruzicka, B.A., Kumar, N., Wang, S., Ping Loh, K., Zhao, H. (2011-04-15). Two-probe study of hot carriers in reduced graphene oxide. Journal of Applied Physics 109 (8) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3573674
Abstract: The energy relaxation of carriers in reduced graphene oxide thin films is studied using optical pump-probe spectroscopy with two probes of different colors. We measure the time difference between peaks of the carrier density at each probing energy by measuring a time-resolved differential transmission and find that the carrier density at the lower probing energy peaks later than that at the higher probing energy. Also, we find that the peak time for the lower probing energy shifts from about 92 to 37 fs after the higher probing energy peak as the carrier density is increased from 1.5 × 1012 to 3 × 1013/cm2, while no noticeable shift is observed in that for the higher probing energy. Assuming the carriers rapidly thermalize after excitation, this indicates that the optical phonon emission time decreases from about 50 to about 20 fs and the energy relaxation rate increases from 4 to 10 meV/fs. The observed density dependence is inconsistent with the phonon bottleneck effect. © 2011 American Institute of Physics.
Source Title: Journal of Applied Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/95368
ISSN: 00218979
DOI: 10.1063/1.3573674
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

14
checked on Nov 14, 2018

WEB OF SCIENCETM
Citations

10
checked on Nov 14, 2018

Page view(s)

40
checked on Oct 19, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.