Fabrication of a Sexithiophene Semiconducting Wire: Nanoshaving with an Atomic Force Microscope Tip

Chwang, Anna B.; Granstrom, Eric L.; Frisbie, C. Daniel

doi:10.1002/(sici)1521-4095(200002)12:4<285::aid-adma285>3.0.co;2-d

Cited by 18 publications

(11 citation statements)

References 5 publications

(6 reference statements)

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“…Understanding of the role of microstructure on transport can be facilitated by microscopic conductance measurements on individual grains and grain boundaries (GBs). Toward this goal, we previously reported an approach for electrically contacting single grains of the organic semiconductor sexithiophene (‘6T', E gap ∼ 2.3 eV) …”

Section: Introductionmentioning

confidence: 99%

“…The barrier φ B from eq 2B is an intrinsic quantity of the Au/6T interface that does not take into account nonidealities, such as trap states, which exist near the contact because of disorder. We have shown in previous studies that our devices demonstrate reversible trapping of positive charge carriers . Defining the effective barrier Φ to be a function of V D and V G allows us to account for any changes in the properties of the Au/6T interface (e.g., trapping or barrier lowering), that are sensitive to the interfacial electric field.…”

Section: Introductionmentioning

confidence: 99%

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Field Effect Transport Measurements on Single Grains of Sexithiophene: Role of the Contacts

Chwang

Frisbie

2000

J. Phys. Chem. B

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This paper presents a study of the contact properties of field effect transistors (FETs) based on single grains of the organic semiconductor sexithiophene (‘6T', E gap ∼ 2.3 eV). The FETs are constructed by vapor deposition of isolated 6T grains 2−15 nm thick and 1−3 μm wide into <500 nm gaps between Au wires pre-patterned on SiO2/Si substrates. The Au wires serve as source and drain contacts to the grain and the doped Si substrate serves as the gate electrode. We show from the contact area dependence of the drain current−drain voltage characteristics that the FETs are contact limited. Both the source/6T and drain/6T interfaces can be considered to be Schottky contacts and, consequently, the device can be modeled as a pair of back-to-back diodes. Current is limited by the reverse-biased, hole injecting source/6T contact where the mechanism of hole injection from the metal to the semiconductor is best described by a drift/diffusion process with a field-dependent mobility. The contact resistance of the source/6T interface can be as high as ∼1 GΩ, or ∼105 Ω-cm normalized for contact width, and is gate and drain voltage dependent. Greater contact resistances result when the Au electrodes are modified with self-assembled monolayers of dodecanethiol or when Cr is used instead of Au, resulting in dramatically inhibited charge transport.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Field Effect Transport Measurements on Single Grains of Sexithiophene: Role of the Contacts

Chwang

Frisbie

2000

J. Phys. Chem. B

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“…7,8 The probe pressed against the substrate can then be scanned to produce lines. This technique is known as nanoshaving, 9 nanografting, 10 or plowing lithography. 11 The probe can be resistively heated to minimize the force needed to perform these types of lithographies on polymer surfaces.…”

Section: Subdiffraction-limited Milling By An Optically Driven Single...mentioning

confidence: 99%

“…For example, positioning the probe at specific surface locations and then applying a large force to the probe may result in irreversible indenting of the surface, which can be used to record structures. , The probe pressed against the substrate can then be scanned to produce lines. This technique is known as nanoshaving, nanografting, or plowing lithography . The probe can be resistively heated to minimize the force needed to perform these types of lithographies on polymer surfaces. , Alternatively, the probe in close contact with the substrate is exposed to femtosecond laser pulses resulting in a tip-enhanced ablation .…”

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confidence: 99%

Subdiffraction-Limited Milling by an Optically Driven Single Gold Nanoparticle

2011

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We propose and demonstrate a hybrid lithographic technique capable of nano-patterning surfaces by optothermal decomposition of a polymeric film induced by a single metal nanoparticle. A tightly-focused laser beam exerting a strong optical force onto the nanoparticle is used to move it inside the polymer film. Due to efficient plasmonic absorption of the laser light the nanoparticle is heated up to temperatures of several hundred degrees, causing melting or even thermal decomposition of the polymer film. By this method grooves less than 100 nm wide and tens-ofmicrometers long can be directly milled in a polymer layer. Keywords nanofabrication; metal nanoparticle; optical forces; plasmonic heatingThere is an increasing demand for technologies capable of patterning surfaces at the nanoscale with high precision, high throughput and in a cost-effective manner. For many applications the desired patterning accuracy can be achieved using electron-beam 1,2 and ionbeam 3,4 lithography or scanning-probe methods 5 based on scanning tunneling microscopy 6 and/or atomic force microscopy 7 techniques. The simplest and most straightforward scanning-probe methods are based on mechanical scratching, etching and removal of material via direct physical contact of the probe with the processed surface. For example, positioning the probe at specific surface locations and then applying a large force to the probe may result in irreversible indenting of the surface, which can be used to record structures. 7,8 The probe pressed against the substrate can then be scanned to produce lines. This technique is known as nanoshaving 9 , nanografting 10 or plowing lithography. 11 The probe can be resistively heated to minimize the force needed to perform these types of lithography on polymer surfaces. 12,13 Alternatively the probe in close contact with the substrate is exposed to fs-laser pulses resulting in a tip-enhanced ablation. 14 Although the scanning methods result in the desired patterning accuracy, they are not suitable for largescale production due to their serial essence, limiting the patterning throughput. The production of nanostructures by optical methods could enable the required high-speed patterning due to possible parallelization of light-based techniques. Due to the diffraction limit however, the resolution of optical methods is limited to some hundreds of nanometers for visible light. Ideally, one would like to combine the advantages of both approaches utilizing the high accuracy of scanning-probe techniques and the ease of parallelization of optical methods.* Address correspondence to andrey.lutich@physik.lmu.de, feldmann@lmu.de.. In this letter we realize this idea by introducing a novel concept of an optically driven nanoburner. The nano-burner is a metal nanoparticle, which is heated up due to strong plasmonic absorption of a focused laser beam and manipulated laterally due to optical forces exerted on it by the same laser beam. The heat released by the movable nanoparticle is used to perform thermally assisted mill...

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“…Die DPN unterscheidet sich sowohl von der Idee als auch von der praktischen Ausführung her grundlegend vom STM-Ansatz der Nanofertigung ("pick-and-place") und stellt eine drastische Abweichung von Techniken dar, die elektrische, [8] thermische, [4,9] mechanische [10] oder photochemische Energie [11] einer Oberfläche zuführen (Abbildung 1). So verwendete man bei der DPN eine AFM-Spitze als Lithographie-…”

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Molekulardrucken mit auslegerlosen Rastersondentechniken

Giam

Mirkin

2011

Angewandte Chemie

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25 bzw. 30 Jahre nach der Erfindung der Rasterkraft‐ und Rastersondenmikroskopie markieren auslegerlose Rastersondenlithographietechniken wie die Polymerstiftlithographie (siehe Bild) eine wichtige Stufe in der Entwicklung von Molekulardrucktechniken. Mit diesen einfachen, robusten und preiswerten Methoden können nahezu beliebige nano‐ und mikroskalige Strukturen organischer und anorganischer Materialien auf Oberflächen erzeugt werden.

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Fabrication of a Sexithiophene Semiconducting Wire: Nanoshaving with an Atomic Force Microscope Tip

Cited by 18 publications

References 5 publications

Field Effect Transport Measurements on Single Grains of Sexithiophene: Role of the Contacts

Field Effect Transport Measurements on Single Grains of Sexithiophene: Role of the Contacts

Subdiffraction-Limited Milling by an Optically Driven Single Gold Nanoparticle

Molekulardrucken mit auslegerlosen Rastersondentechniken

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