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Title: Effects of disorder on the optical properties of CVD grown polycrystalline graphene
Authors: Podila, Ramakrishna
Anand, Benoy
Spear, John T.
Puneet, P.
Philip, Reji
Siva Sankara Sai, S.
Rao, Apparao M.
Issue Date: Mar-2012
Publisher: RSC Publishing
Citation: Nanoscal, 2012, Vol. 4, p1770
Abstract: We explore the effects of crystallite size (La) on the linear and non-linear optical properties of chemical vapor deposition grown polycrystalline graphene. The π-plasmon resonance present at [similar]4.75 eV ([similar]260 nm) in the optical absorption spectrum of graphene follows the empirical relationship λπ = 250.5 nm + 89.5 nm2/La, where λπ represents the π-plasmon wavelength. Furthermore, our Z-scan studies reveal that the crystallite size significantly changes the saturation intensity in CVD grown graphene. Notably, in comparison to epitaxial graphene layers grown on SiC wafers which exhibit a photogenerated carrier lifetime of few picoseconds, we find that the photogenerated carriers in our CVD grown graphene can exhibit lifetimes as long as nanoseconds.
Description: Restricted Access
ISSN: 2040-3364
2040-3372 (Online)
Alternative Location:
Copyright: 2012 RSC Publishing
Appears in Collections:Research Papers (LAMP)

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