Solvated C70 single crystals for organic field effect transistors

Mitake, Yuji; Gomita, Ayaka; Yamamoto, Ryohei; Watanabe, Miyabi; Suzuki, Ryo; Aoki, Nobuyuki; Tanimura, Makoto; Hirai, Tadahiko; Tachibana, Masaru

doi:10.1016/j.cplett.2022.140094

Cited by 2 publications

(2 citation statements)

References 48 publications

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“…From the data in Figure S1, we conclude that the C 70 nanosheets FETs behave as n-channel, normally-on type FETs. The similar normally-on type FETs were also reported for fullerene nanomaterials-based FETs after annealing [47,48]. This will be due to the doping by residual ferrocene and/or partial polymerization of fullerenes by annealing.…”

Section: Resultssupporting

confidence: 75%

“…Such complete elimination of the hole transport clearly demonstrated n-type behavior, indicating a full and irreversible change of the device's semiconductor characteristics from ambipolar to unipolar. By contrast, previous studies demonstrated that FET devices utilizing pristine C 70 materials fabricated via solution processes, such as C 70 nanosheets [46] and C 70 single-crystal needles [47], did not exhibit a switching of their semiconducting properties when measured in an N 2 environment. These observations and the results of previous studies lead us to attribute the switching behavior observed in the current study to the ablation of the Fc molecules during the heat treatment.…”

Section: Resultsmentioning

confidence: 68%

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Ambipolar to Unipolar Conversion in C70/Ferrocene Nanosheet Field-Effect Transistors

Mahdaoui,

Hirata,

Nagaoka

et al. 2023

Nanomaterials

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Organic cocrystals, which are assembled by noncovalent intermolecular interactions, have garnered intense interest due to their remarkable chemicophysical properties and practical applications. One notable feature, namely, the charge transfer (CT) interactions within the cocrystals, not only facilitates the formation of an ordered supramolecular network but also endows them with desirable semiconductor characteristics. Here, we present the intriguing ambipolar CT properties exhibited by nanosheets composed of single cocrystals of C70/ferrocene (C70/Fc). When heated to 150 °C, the initially ambipolar monoclinic C70/Fc nanosheet-based field-effect transistors (FETs) were transformed into n-type face-centered cubic (fcc) C70 nanosheet-based FETs owing to the elimination of Fc. This thermally induced alteration in the crystal structure was accompanied by an irreversible switching of the semiconducting behavior of the device; thus, the device transitions from ambipolar to unipolar. Importantly, the C70/Fc nanosheet-based FETs were also found to be much more thermally stable than the previously reported C60/Fc nanosheet-based FETs. Furthermore, we conducted visible/near-infrared diffuse reflectance and photoemission yield spectroscopies to investigate the crucial role played by Fc in modulating the CT characteristics. This study provides valuable insights into the overall functionality of these nanosheet structures.

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 68%

Ambipolar to Unipolar Conversion in C70/Ferrocene Nanosheet Field-Effect Transistors

Mahdaoui,

Hirata,

Nagaoka

et al. 2023

Nanomaterials

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Liquid–Liquid Interfacial Nanoarchitectonics

Ariga

2023

Small

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Science in the small world has become a crucial key that has the potential to revolutionize materials technology. This trend is embodied in the postnanotechnology concept of nanoarchitectonics. The goal of nanoarchitectonics is to create bio‐like functional structures, in which self‐organized and hierarchical structures are working efficiently. Liquid–liquid interface like environments such as cell membrane surface are indispensable for the expression of biological functions through the accumulation and organization of functional materials. From this viewpoint, it is necessary to reconsider the liquid–liquid interface as a medium where nanoarchitectonics can play an active role. In this review, liquid–liquid interfacial nanoarchitectonics is classified by component materials such as organic, inorganic, carbon, and bio, and recent research examples are discussed. Examples discussed in this paper include molecular aggregates, supramolecular polymers, conductive polymers film, crystal‐like capsules, block copolymer assemblies, covalent organic framework (COF) films, complex crystals, inorganic nanosheets, colloidosomes, fullerene assemblies, all‐carbon π‐conjugated graphite nanosheets, carbon nanoskins and fullerphene thin films at liquid–liquid interfaces. Furthermore, at the liquid–liquid interface using perfluorocarbons and aqueous phases, cell differentiation controls are discussed with the self‐assembled structure of biomaterials. The significance of liquid–liquid interfacial nanoarchitectonics in the future development of materials will then be discussed.

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Solvated C70 single crystals for organic field effect transistors

Cited by 2 publications

References 48 publications

Ambipolar to Unipolar Conversion in C70/Ferrocene Nanosheet Field-Effect Transistors

Ambipolar to Unipolar Conversion in C70/Ferrocene Nanosheet Field-Effect Transistors

Liquid–Liquid Interfacial Nanoarchitectonics

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