scholarly journals Columnar liquid-crystalline assemblies of X-shaped pyrene–oligothiophene conjugates: photoconductivities and mechanochromic functions

2016 ◽  
Vol 4 (22) ◽  
pp. 5073-5080 ◽  
Author(s):  
Kian Ping Gan ◽  
Masafumi Yoshio ◽  
Takashi Kato
Keyword(s):  
Phase Transition ◽  
Transport Properties ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Carrier Transport ◽  
Colour Change ◽  
The Self ◽  
Conjugated Molecules ◽  
Crystalline Structures ◽  
Carrier Transport Properties

The self-assembly of X-shaped pyrene–oligothiophene conjugated molecules results in the formation of columnar liquid-crystalline structures that exhibit hole carrier transport properties and shear-induced phase transition accompanied by the luminescent colour change.

scholarly journals Guanine–oligothiophene conjugates: liquid-crystalline properties, photoconductivities and ion-responsive emission of their nanoscale assemblies

2018 ◽  
Vol 9 (3) ◽  
pp. 576-585 ◽  
Author(s):  
Kian Ping Gan ◽  
Masafumi Yoshio ◽  
Yuki Sugihara ◽  
Takashi Kato
Keyword(s):  
Phase Transition ◽  
Transport Properties ◽  
Liquid Crystalline ◽  
Carrier Transport ◽  
Colour Change ◽  
Carrier Transport Properties

Liquid-crystalline conjugated guanine–oligothiophene derivatives show electron or ambipolar carrier transport properties and ion-induced phase transition accompanied by a luminescence colour change.

Hole Transport in Self-Organized Oligosilane Thin Films with Highly Ordered Hopping Sites

2001 ◽  
Vol 707 ◽  
Author(s):  
H. Okumoto ◽  
T. Yatabe ◽  
A. Richter ◽  
M. Shimomura ◽  
A. Kaito ◽  
...  
Keyword(s):  
Thin Films ◽  
Transport Properties ◽  
Carrier Transport ◽  
Hole Mobility ◽  
Multilayered Structure ◽  
Hole Transport ◽  
Conjugated Molecules ◽  
Disordered Structures ◽  
Self Organized ◽  
Carrier Transport Properties

ABSTRACTSelf-organized oligosilane thin films possess molecular orientation normal to substrates with multilayered structure. This unique order of σ-conjugated molecules results in good hole transport properties. In the present work, carrier transport properties at low temperature are studied for 1,10-diethyldecamethylsilane polycrystalline films. Even at a temperature as low as 173 K, a time-of-flight transient photocurrent waveform showed a clear plateau and a sharp decay, whose shape is similar to that at room temperature. Their hole mobility followed Arrhe-nius type temperature dependence with a small activation energy of 0.09 eV. The hole mobility of 6.3×10-5cm-2/Vs at 193 K was more than 2 orders of magnitude higher than that of typical polysilanes, which inevitably contain disordered structures hindering smooth carrier transport.

Interfacial chemistry in self-assembled nanoscale materials with structural orderin

2000 ◽  
Vol 72 (1-2) ◽  
pp. 269-279 ◽  
Author(s):  
Jun Liu ◽  
Glen E. Fryxell ◽  
Maoxu Qian ◽  
Li-Qiong Wang ◽  
Yong Wang
Keyword(s):  
Self Assembly ◽  
Liquid Crystalline ◽  
Inorganic Materials ◽  
The Self ◽  
Nanoscale Materials ◽  
Interfacial Chemistry ◽  
Crystalline Structures ◽  
Atomic Structures ◽  
Potential Applications ◽  
Inorganic Nanocomposites

This paper discusses the interfacial chemistry encountered in the self-assembly of ordered nanoscale materials based on surfactant liquid crystalline structures. The paper contains three sections. The first section gives a brief introduction to the interfacial chemistry in the co-assembly of surfactants and inorganic materials. The second section discusses the formation of inorganic–inorganic nanocomposites, the properties of such materials, and the interfacial atomic structures. The last section discusses hybrid nanoscale materials with functional monolayers, their interfacial chemistry, and their potential applications.

Hole Transport In Self-Organized Oligosilane Thin Films With Highly Ordered Hopping Sites

2001 ◽  
Vol 708 ◽  
Author(s):  
H. Okumoto ◽  
T. Yatabe ◽  
A. Richter ◽  
M. Shimomura ◽  
A. Kaito ◽  
...  
Keyword(s):  
Thin Films ◽  
Transport Properties ◽  
Carrier Transport ◽  
Hole Mobility ◽  
Multilayered Structure ◽  
Hole Transport ◽  
Conjugated Molecules ◽  
Disordered Structures ◽  
Self Organized ◽  
Carrier Transport Properties

ABSTRACTSelf-organized oligosilane thin films possess molecular orientation normal to substrates with multilayered structure. This unique order of -conjugated molecules results in good hole transport properties. In the present work, carrier transport properties at low temperature are studied for 1,10-diethyldecamethylsilane polycrystalline films. Even at a temperature as low as 173 K, a time-of-flight transient photocurrent waveform showed a clear plateau and a sharp decay, whose shape is similar to that at room temperature. Their hole mobility followed Arrhenius type temperature dependence with a small activation energy of 0.09 eV. The hole mobility of 6.3×10-5cm2/Vs at 193 K was more than 2 orders of magnitude higher than that of typical polysilanes, which inevitably contain disordered structures hindering smooth carrier transport.

Availability of Liquid Crystalline Materials for Organic Polycrystalline Semiconductor Thin Films

2006 ◽  
Vol 965 ◽  
Author(s):  
Hiroaki Iino ◽  
Jun-ichi Hanna
Keyword(s):  
Thin Films ◽  
Liquid Crystals ◽  
Grain Boundaries ◽  
Transport Properties ◽  
Liquid Crystalline ◽  
Carrier Transport ◽  
Polycrystalline Films ◽  
Semiconductor Thin Films ◽  
Polycrystalline Semiconductor ◽  
Carrier Transport Properties

ABSTRACTWe have investigated the charge carrier transport properties of polycrystalline films fabricated with discotic and calamitic liquid crystals. The polycrystalline films of these liquid crystals exhibiting particular textures under a polarized microscope, i.e., hexagonal and co-circular patterns for discotic and calamitic liquid crystals, respectively, which indicate that the molecular alignment in the liquid crystalline phase is well preserved exhibit clear hole transport along with molecular stacks even in a 15 μm thick film, judging from transient photocurrents by time of flight method. The hole mobilities are over 0.1 cm2/Vs at room temperature. These results indicate formation of fewer grain boundaries across conduction channels. On the other hand, the carrier transport properties in the polycrystalline films of non-liquid crystalline molecules with the same molecular shape exhibit no particular patterns as described and photocurrents are annihilated in the bulk as a function of time, indicating many deep trap sites in grain boundaries. The present results indicate that the liquid crystalline molecule is a good candidate for preparing quality organic polycrystalline semiconductor thin films in opto-electronic applications.

Molecular design of benzothienobenzothiophene-cored columnar mesogens: facile synthesis, mesomorphism, and charge carrier mobility

2018 ◽  
Vol 6 (16) ◽  
pp. 4471-4478 ◽  
Author(s):  
Chun-Xia Liu ◽  
Hu Wang ◽  
Jun-Qi Du ◽  
Ke-Qing Zhao ◽  
Ping Hu ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Transport Properties ◽  
Carrier Mobility ◽  
Liquid Crystalline ◽  
Carrier Transport ◽  
Molecular Design ◽  
Charge Carrier Mobility ◽  
Charge Carrier Transport ◽  
Facile Synthesis ◽  
Carrier Transport Properties

Benzothienobenzothiophene (BTBT) liquid-crystalline semiconductors are arousing a lot of interest due to their long-range ordered, self-organizational abilities and high-charge carrier transport properties.

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