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Nano Lett. 2009 May;9(5):1949-55. doi: 10.1021/nl9001525.

Low-temperature solution processing of graphene-carbon nanotube hybrid materials for high-performance transparent conductors.

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Department of Materials Science and Engineering and California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California, 90095, USA.


We report the formation of a nanocomposite comprised of chemically converted graphene and carbon nanotubes. Our solution-based method does not require surfactants, thus preserving the intrinsic electronic and mechanical properties of both components, delivering 240 ohms/square at 86% transmittance. This low-temperature process is completely compatible with flexible substrates and does not require a sophisticated transfer process. We believe that this technology is inexpensive, is massively scalable, and does not suffer from several shortcomings of indium tin oxide. A proof-of-concept application in a polymer solar cell with power conversion efficiency of 0.85% is demonstrated. Preliminary experiments in chemical doping are presented and show that optimization of this material is not limited to improvements in layer morphology.

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