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Optical response of large scale single layer graphene

Cited 76 time in Web of Science Cited 81 time in Scopus
Authors
Lee, Chul; Kim, Joo Youn; Bae, Sukang; Kim, Keun Soo; Hong, Byung Hee; Choi, E. J.
Issue Date
2011-02
Citation
Applied Physics Letters, Vol.98 No.7, p. 071905
Abstract
We have measured optical transmission and reflection spectra of large scale graphene grown by chemical vapor deposition technique over the extensive frequency range from far-IR to uv (4 meV-6.2 eV). Large scale graphene exhibits an excitonic absorption peak in the uv-region ((h) over bar omega = 4.6 eV) and the constant interband absorption with sigma(1)(omega) = e(2)/4 (h) over bar in the IR-visible region, respectively. In the far-IR range, Drude peak is observed, and its strength omega(2)(p,2d) indicates the induced carrier density N-2d = 1.95 x 10(12) cm(-2). These results are highly consistent with the theoretical prediction/experimental results of the single layer graphene. It proves that, contrary to the doubts about its quality due to the chemical growth process, the sample has single layer optical response over the entire photon energy; therefore, it can be applied to large scale devices such as terahertz-IR detector, solar cell material, and visible uv-transparent conductor. (C) 2011 American Institute of Physics. [doi:10.1063/1.3555425]
ISSN
0003-6951
URI
https://hdl.handle.net/10371/172163
DOI
https://doi.org/10.1063/1.3555425
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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