Reinvestigation of Carrier Transport Properties in Liquid Crystalline 2-Phenylbenzothiazole Derivatives

2007 ◽  
Vol 111 (42) ◽  
pp. 12041-12044 ◽  
Author(s):  
Keiji Tokunaga ◽  
Hiroaki Iino ◽  
Jun-ichi Hanna
Keyword(s):  
Transport Properties ◽  
Liquid Crystalline ◽  
Carrier Transport ◽  
Carrier Transport Properties

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.

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.

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.

Carrier Transport Properties in Crosslinked Polymer / Liquid Crystalline Semiconductor Composite

2001 ◽  
Vol 709 ◽  
Author(s):  
Naoki Yoshimoto ◽  
Masahiro Funahashi ◽  
Jun-ichi Hanna
Keyword(s):  
Electric Field ◽  
Transport Properties ◽  
Liquid Crystalline ◽  
Carrier Transport ◽  
Composite System ◽  
Pure Liquid ◽  
Crosslinked Polymer ◽  
Crystalline Semiconductor ◽  
Doped Polymers ◽  
Carrier Transport Properties

ABSTRACTA novel composite system containing of liquid crystalline semiconductor and crosslinked polymer exhibited high hole mobilities with comparison of that of pure liquid crystalline molecules. The carrier transport properties were influenced by the polymerized conditions. The mobilities were independent on temperature and electric field in the case of mesophases polymerized samples. These carrier transport properties were essentially different of those of well-known molecularly doped polymers.

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