Article Dans Une Revue Carbon Année : 2018

Graphene exfoliation in the presence of semiconducting polymers for improved film homogeneity and electrical performances

Résumé

We report on the production of hybrid graphene/semiconducting polymer films in one step procedure by making use of ultrasound-assisted liquid-phase exfoliation of graphite powder in the presence of π-conjugated polymers, i.e. poly(3-hexylthiophene) (P3HT) or poly [4-(4,4dihexadecyl-4H-cyclopenta[1,2-b:5,4-b']dithiophen-2-yl)-alt-[1,2,5]thiadiazolo-[3,4c]pyridine] (PCDTPT). The polymers were chosen in view of their different propensity to form crystalline structures, their decoration with alkyl chains that are known to possess high affinity for the basal plane of graphene, the energy levels of their frontier orbitals which are extremely similar to the work function of graphene, and their high electrical performance when integrated in field-effect transistors (FETs). The polymers act as a dispersion-stabilizing agent and prevent the re-aggregation of the exfoliated graphene flakes, ultimately enabling the production of homogeneous bi-component dispersions. The electrical characterization of fewlayer graphene/PCDTPT hybrids, when integrated as active layer in bottom-contact bottomgate FETs, revealed an increase of the field-effect mobility compared to the π-conjugatedbased pristine devices, a result which can be attributed to the joint effect of the few-layer graphene sheets and semiconducting polymers improving the charge-transport in the channel of the field-effect transistor. In particular, few-layer graphene/PCDTPT films displayed a 30fold increase of PCDTPT's mobility if compared to pristine polymer samples. Such findings represent a step forward towards the optimization of graphene exfoliation and processing into electronic devices, as well as towards improved electrical performance in organic-based fieldeffect transistors.

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hal-04834044 , version 1 (12-12-2024)

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Tim Leydecker, Matilde Eredia, Fabiola Liscio, Silvia Milita, Georgian Melinte, et al.. Graphene exfoliation in the presence of semiconducting polymers for improved film homogeneity and electrical performances. Carbon, 2018, 130, pp.495-502. ⟨10.1016/j.carbon.2018.01.042⟩. ⟨hal-04834044⟩
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