Highly Tunable Charge Transport in Layer-by-Layer Assembled Graphene Transistors
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- Highly Tunable Charge Transport in Layer-by-Layer Assembled Graphene Transistors
- Hwang, Hyunmin; Joo, Piljae; Kang, Moon Sung; Ahn, Gukmoon; Han, Joong Tark; Kim, Byeong-Su; Cho, Jeong Ho
- Ambipolar; Bi-layer; Carbon atoms; Electrical behaviors; Electronic device; grapheme; Graphene multilayers; Graphene oxides; Graphene transistors; Layer-by-layer assemblies; layer-by-layer assembly; Layer-by-layers; Nitrogen atom; nitrogen doping; P-type; Positively charged; Reduced graphene oxides; Systematic method; Temperature dependent; Thermal reduction; Time of flight secondary ion mass spectrometry; Unipolar transition; Versatile methods
- Issue Date
- AMER CHEMICAL SOC
- ACS NANO, v.6, no.3, pp.2432 - 2440
- We demonstrate a controlled, systematic method to tune the charge transport in graphene field-effect transistors based on alternating layer-by-layer assembly of positively and negatively charged graphene oxide followed by thermal reduction. Surprisingly, tuning the number of bilayers of thermally reduced graphene oxide multilayer films allowed achieving either ambipolar or unipolar (both n- and p-type) transport In graphene transistors. On the basis of X-ray photoemission spectroscopy, Raman spectroscopy, time-of-flight secondary ion mass spectrometry, and temperature-dependent charge transport measurements, we found that nitrogen atoms from the functional groups of positively charged graphene oxide are incorporated Into the reduced graphene oxide films and substitute carbon atoms during the thermal reduction. This nitrogen-doping process occurs in different degrees for graphene multilayers with varying numbers of bilayers and thereby results in the interesting transition in the electrical behavior In graphene multilayer transistors. We believe that such a versatile method to control the charge transport in graphene muttilayers will further promote their applications in solution-processable electronic devices based on graphene.
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