Photoactive self-assembled monolayers for optically switchable organic thin-film transistors

Salinas, Michael; Halik, Marcus

doi:10.1063/1.4804595

Cited by 23 publications

(16 citation statements)

References 27 publications

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“…Salinas and Halik inserted a fullerene-attached self-assembled monolayer (C 60 -SAM) between a gate dielectric Al 2 O 3 layer and transistor channel layers (pentacene and dihexylsexithiophene [DH6T]) [81]. The C 60 works as an acceptor to reduce the operating voltage.…”

Section: Light-receiving Ofetsmentioning

confidence: 99%

Recent progress in photoactive organic field-effect transistors

Wakayama

Hayakawa

Seo

2014

Science and Technology of Advanced Materials

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Recent progress in photoactive organic field-effect transistors (OFETs) is reviewed. Photoactive OFETs are divided into light-emitting (LE) and light-receiving (LR) OFETs. In the first part, LE-OFETs are reviewed from the viewpoint of the evolution of device structures. Device performances have improved in the last decade with the evolution of device structures from single-layer unipolar to multi-layer ambipolar transistors. In the second part, various kinds of LR-OFETs are featured. These are categorized according to their functionalities: phototransistors, non-volatile optical memories, and photochromism-based transistors. For both, various device configurations are introduced: thin-film based transistors for practical applications, single-crystalline transistors to investigate fundamental physics, nanowires, multi-layers, and vertical transistors based on new concepts.

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Section: Light-receiving Ofetsmentioning

confidence: 99%

Recent progress in photoactive organic field-effect transistors

Wakayama

Hayakawa

Seo

2014

Science and Technology of Advanced Materials

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“…Monolayers of close-packed fullerenes on metal surfaces belong to one of the most extensively studied self-assembled systems due to their rich structural and electronic properties [ 1 ]. A considerable interest in C 60 films arises from their use in photovoltaic cells [ 2 – 3 ] and potential applications in molecular electronics [ 4 ]. Likewise, C 60 molecules can be used as chemical anchoring groups to bind functional molecules to electrodes and thus, to construct electronic circuits.…”

Section: Introductionmentioning

confidence: 99%

Enhanced fullerene–Au(111) coupling in (2√3 × 2√3)R30° superstructures with intermolecular interactions

Paßens¹,

Waser²,

Karthäuser³

2015

Beilstein J. Nanotechnol.

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SummaryDisordered and uniform (2√3 × 2√3)R30° superstructures of fullerenes on the Au(111) surface have been studied using scanning tunneling microscopy and spectroscopy. It is shown that the deposition and growth process of a fullerene monolayer on the Au(111) surface determine the resulting superstructure. The supply of thermal energy is of importance for the activation of a Au vacancy forming process and thus, one criterion for the selection of the respective superstructure. However, here it is depicted that a vacancy–adatom pair can be formed even at room temperature. This latter process results in C60 molecules that appear slightly more bright in scanning tunnelling microscopy images and are identified in disordered (2√3 x 2√3)R30° superstructures based on a detailed structure analysis. In addition, these slightly more bright C60 molecules form uniform (2√3 x 2√3)R30° superstructures, which exhibit intermolecular interactions, likely mediated by Au adatoms. Thus, vacancy–adatom pairs forming at room temperature directly affect the resulting C60 superstructure. Differential conductivity spectra reveal a lifting of the degeneracy of the LUMO and LUMO+1 orbitals in the uniform (2√3 x 2√3)R30° superstructure and in addition, hybrid fullerene–Au(111) surface states suggest partly covalent interactions.

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“…SAMs of functionalized fullerenes have been used in organic photovoltaics, 13,21,22 memory transistors, 9 light sensors 23 and SAMFETs. 18,24,25 In all of these devices the order of the SAM is of crucial importance for electronic properties.…”

Section: Introductionmentioning

confidence: 99%

Tuning the molecular order of C₆₀-based self-assembled monolayers in field-effect transistors

Schmaltz¹,

Khassanov²,

Steinrück

et al. 2014

Nanoscale

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The control of order in organic semiconductor systems is crucial to achieve desired properties in electronic devices. We have studied the order in fullerene functionalized self-assembled monolayers by mixing the active molecules with supporting alkyl phosphonic acids of different chain length. By adjusting the length of the molecules, structural modifications of the alignment of the C 60 head groups within the SAM can be tuned in a controlled way. These changes on the sub-nanometre scale were analysed by grazing incidence X-ray diffraction and X-ray reflectivity. To study the electron transport properties across these layers, self-assembled monolayer field-effect transistors (SAMFETs) were fabricated containing only the single fullerene monolayer as semiconductor. Electrical measurements revealed that a high 2D crystalline order is not the only important aspect. If the fullerene head groups are too confined by the supporting alkyl phosphonic acid molecules, defects in the crystalline C 60 film, such as grain boundaries, start to strongly limit the charge transport properties. By close interpretation of the results of structural investigations and correlating them to the results of electrical characterization, an optimum chain length of the supporting alkyl phosphonic acids in the range of C 10 was determined. With this study we show that minor changes in the order on the sub-nanometre scale, can strongly influence electronic properties of functional self-assembled monolayers.

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Photoactive self-assembled monolayers for optically switchable organic thin-film transistors

Cited by 23 publications

References 27 publications

Recent progress in photoactive organic field-effect transistors

Recent progress in photoactive organic field-effect transistors

Enhanced fullerene–Au(111) coupling in (2√3 × 2√3)R30° superstructures with intermolecular interactions

Tuning the molecular order of C₆₀-based self-assembled monolayers in field-effect transistors

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Photoactive self-assembled monolayers for optically switchable organic thin-film transistors

Cited by 23 publications

References 27 publications

Recent progress in photoactive organic field-effect transistors

Recent progress in photoactive organic field-effect transistors

Enhanced fullerene–Au(111) coupling in (2√3 × 2√3)R30° superstructures with intermolecular interactions

Tuning the molecular order of C60-based self-assembled monolayers in field-effect transistors

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Tuning the molecular order of C₆₀-based self-assembled monolayers in field-effect transistors