Journal
NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms5224
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Funding
- Energy Research Frontier Center (EFRC) - DOE, Office of Science, BES [DESC0001160]
- U.S. ONR MURI programme
- NSF-CMMI [1300361]
- ARC
- Maryland Nanocenter
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1300361] Funding Source: National Science Foundation
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Various band structure engineering methods have been studied to improve the performance of graphitic transparent conductors; however, none has demonstrated an increase of optical transmittance in the visible range. Here we measure in situ optical transmittance spectra and electrical transport properties of ultrathin graphite (3-60 graphene layers) simultaneously during electrochemical lithiation/delithiation. On intercalation, we observe an increase of both optical transmittance (up to twofold) and electrical conductivity (up to two orders of magnitude), strikingly different from other materials. Transmission as high as 91.7% with a sheet resistance of 3.0 Omega per square is achieved for 19-layer LiC6, which corresponds to a figure of merit sigma(dc)/sigma(opt) = 1,400, significantly higher than any other continuous transparent electrodes. The unconventional modification of ultrathin graphite optoelectronic properties is explained by the suppression of interband optical transitions and a small intraband Drude conductivity near the interband edge. Our techniques enable investigation of other aspects of intercalation in nanostructures.
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