Effects of disorder on the optical properties of CVD grown polycrystalline graphene.
We explore the effects of crystallite size (L(a)) on the linear and non-linear optical properties of chemical vapor deposition grown polycrystalline graphene. The π-plasmon resonance present at ∼4.75 eV (∼260 nm) in the optical absorption spectrum of graphene follows the empirical relationship λ(π) = 250.5 nm + 89.5 nm(2)/L(a), where λ(π) 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.
Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA.
Ramakrishna
R
Podila
Benoy
B
Anand
John T
JT
Spear
P
P
Puneet
Reji
R
Philip
S Siva Sankara
SS
Sai
Apparao M
AM
Rao