One-dimensional hopping transport in a columnar discotic liquid-crystalline glass

Bleyl, Ingo; Erdelen, Christian H.; Schmidt, Hans‐Werner; Haarer, D.

doi:10.1080/13642819908206420

Cited by 69 publications

(59 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In a columnar phase of triphenylene dimer, the hole mobility is independent of the temperature above room temperature and decreases with a decrease in the temperature below it [5]. The same tendency is observed in the SmE phase of alkynylterthiophene derivatives both for holes and electrons.…”

Section: Introductionsupporting

confidence: 57%

“…Bulk carrier transport characteristics have been studied by the time-of-flight technique. In the columnar and smectic phases, temperature-independent carrier mobilities have been observed above critical temperatures [5], [6]. In the case of LC alkynylterthiophene, the temperature is -20°e.…”

Section: Characteristics Ofthe Field-effect Transistors Using 3-mentioning

confidence: 97%

“…The same tendency is observed in the SmE phase of alkynylterthiophene derivatives both for holes and electrons. A mechanism based on the disorder formalism has been proposed to explain the temperature-independence of the carrier mobilities in the LC phases [5], [6]. This independence has been attributed to a small energetic disorder in the LC phases compared to the amorphous phases.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Temperature-Independent Hole Mobility in Field-Effect Transistors Based on Liquid-Crystalline Semiconductors

Funahashi

Zhang

Tamaoki

2011

IEICE Trans. Electron.

View full text Add to dashboard Cite

SUMMARY Thin-film transistors based on Liquid-crystalline phenylterthiophenes, 3-TTPPh-5 and 3-TTPPhF4-6 are fabricated with a spincoating method. The devices exhibit p-type operation with the mobility on the order of 10-2 cm 2 V-1 s-l. The field-effect mobilities of the transistors using 3-TTPPh-5 and 3-TTPPhF4-6 are almost independent of the temperature above room temperatnre. In particular, the temperature range in which the mobility is constant is between 230 and 350 K for 3-TIPPh-5.

show abstract

Section: Introductionsupporting

confidence: 57%

Section: Characteristics Ofthe Field-effect Transistors Using 3-mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Temperature-Independent Hole Mobility in Field-Effect Transistors Based on Liquid-Crystalline Semiconductors

Funahashi

Zhang

Tamaoki

2011

IEICE Trans. Electron.

View full text Add to dashboard Cite

show abstract

“…Conventional LC semiconductors exhibit LC phases within narrow, elevated temperature ranges. The carrier transport characteristics of the columnar ordered phases of LC triphenylene dimers, 48 terthiophene 6 and phenylterthiophene 7 derivatives were studied over wide temperature ranges. In contrast to alkyl-substituted LC semiconductors with rigid structures, the electron transport processes in the nanosegregated columnar phases of oligosiloxane-substituted PTCBI derivatives are affected by the dynamic softness of the columnar aggregates.…”

Section: Electron Transport Characteristics In Nanosegregated Columnamentioning

confidence: 99%

“…47 The field-and temperature-dependence of the electron mobility was analyzed based on a one-dimensional disorder model. 48 In this model, carrier mobility μ is described by equation (1), where T is the temperature, F is the electric field, σ is the energetic disorder, Σ is the positional disorder and C is a constant. The energetic disorder s indicates the width of the Gaussian distribution of LUMO levels of the PTCBI cores, and μ 0 is a pre-exponential parameter corresponding to the upper limit of the electron mobility without disorder.…”

Section: Electron Transport Characteristics In Nanosegregated Columnamentioning

confidence: 99%

Integration of electro-active π-conjugated units in nanosegregated liquid-crystalline phases

Funahashi

2016

Polym J

View full text Add to dashboard Cite

Unlike conventional liquid crystals bearing alkyl chains, perylene tetracarboxylic bisimide (PTCBI) derivatives bearing oligosiloxane moieties were synthesized. The oligosiloxane moieties are bulky and have a tendency to form a liquid-like conformation due to the low rotation potential of Si-O bonds. The PTCBI derivatives bearing oligosiloxane chains exhibit the columnar phase at room temperature. They are soluble in various organic solvents, and thin films can be produced by a spin-coating method. In the columnar phase, crystal-like π-stacks are surrounded by a liquid-like mantle consisting of the oligosiloxane moieties of the PTCBI derivatives, resulting in efficient electron transport. Even the PTCBI derivatives bearing polymerizable cyclotetrasiloxane rings show the liquid-crystalline (LC) phases at room temperature. The spin-coated films of the LC PTCBI derivatives with cyclotetrasiloxane rings can be polymerized and insolubilized by exposure to the vapors of trifluoromethanesulfonic acid. PTCBI derivatives bearing oligosiloxane moieties and a triethylene oxide chain coordinated to ionic species exhibit a dimeric lamellar phase in which ion-conductive sublayers and electron-transporting π-stacks are separately self-organized. Phenylterthiophene derivatives bearing oligosiloxane moieties show a ferroelectric smectic C* phase in which the anomalous photovoltaic effect is observed.

show abstract

Diskotische Flüssigkristalle: Materialien für die Optoelektronik

Kopitzke¹,

Wendorff²

2000

Chemie in unserer Zeit

View full text Add to dashboard Cite

Kolumnare diskotische Materialien haben aufgrund der spontanen Ausbildung von eindimensionalen kolumnaren Strukturen eine Reihe von interessanten elektronischen und optischen Eigenschaften, die sie für den technischen Einsatz im Bereich der optischen Informationstechnologie interessant machen. Die räumliche Modulation der kolumnaren Struktur und die damit verbundene räumliche Modulation der dielektrischen Eigenschaften verursacht Veränderungen in der Bandstruktur von mit Flüssigkristallen beschichteten Materialien. Denkbar ist der Einsatz solcher Hybridsysteme in der Sensorik.

show abstract

One-dimensional hopping transport in a columnar discotic liquid-crystalline glass

Cited by 69 publications

References 23 publications

Temperature-Independent Hole Mobility in Field-Effect Transistors Based on Liquid-Crystalline Semiconductors

Temperature-Independent Hole Mobility in Field-Effect Transistors Based on Liquid-Crystalline Semiconductors

Integration of electro-active π-conjugated units in nanosegregated liquid-crystalline phases

Diskotische Flüssigkristalle: Materialien für die Optoelektronik

Contact Info

Product

Resources

About