Journal ArticleDOI
Effect of Domain Boundary on Carrier Transport of Calamitic Liquid Crystalline Photoconductive Materials
TLDR
In this paper, the effect of defects in the bulk and at the domain boundary on carrier transport was investigated by measuring transient photocurrents in thick cells up to 120 μm in thickness and in the cells of different domain sizes of 10−100s μm.Abstract:
Smectic mesophases in the calamitic liquid crystalline materials such as 2-phenylnaphthalene derivatives exhibit fast ambipolar carrier transport, whose mobility is up to 10−2 cm2/Vs. For these mesophases, we have investigated the effect of defects in the bulk and at the domain boundary on these carrier transport by measuring transient photocurrents in thick cells up to 120 μm in thickness and in the cells of different domain sizes of 10–100s μm. It was found that non-dispersive carrier transports was observed for all the cells and the carrier transport was affected neither by cell thickness nor by domain sizes. Thus, it was concluded that there are few deep defects in the bulk and that the domain boundary is electrically inactive in these mesophases, demonstrating their high potential for practical application to large-area electronic devices.read more
Citations
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Journal ArticleDOI
High Carrier Mobility up to 0.1 cm2 V–1 s–1 at Ambient Temperatures in Thiophene‐Based Smectic Liquid Crystals
Journal ArticleDOI
Enhanced Hole‐Transporting Behavior of Discotic Liquid‐Crystalline Physical Gels
Yuki Hirai,Hirosato Monobe,Norihiro Mizoshita,Masaya Moriyama,Kenji Hanabusa,Yo Shimizu,Takashi Kato +6 more
TL;DR: The hole mobilities of the discotic liquid-crystalline (LC) physical gels measured by a time-of-flight method become higher than those of LC triphenylenes alone.
Journal ArticleDOI
Bipolar carrier transport in a lamello-columnar mesophase of a sanidic liquid crystal
Stéphane Méry,Denis Haristoy,Jean-François Nicoud,Daniel Guillon,Siegmar Diele,Hirosato Monobe,Yo Shimizu +6 more
TL;DR: In this article, the lamello-columnar mesophase of a [1]benzothieno[3,2-b]b][1] benzothiophene-2,7-dicarboxylate (BTBT) derivative has been investigated by means of X-rays on an aligned sample.
Journal ArticleDOI
Three-chain truxene discotic liquid crystal showing high charged carrier mobility
TL;DR: A new truxene discotic liquid crystal possessing only three octyloxy chains was studied on the mesomorphic and semiconducting properties to reveal that it exhibits a high drift mobility of positive carriers in the hexagonal ordered columnar (Col(ho)) mesophase.
Journal ArticleDOI
Electronic and ionic carrier transport in discotic liquid crystalline photoconductor
TL;DR: In this article, the negative charge carrier transport in discotic columnar phases of triphenylene derivatives, 2,3,6,7,10,11-hexapentyloxytriphenylene (H5T) and its related derivatives such as H4T and H6T, was investigated by time-of-flight experiments.
References
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Organic photoreceptors for xerography
TL;DR: Xerographic photoreceptors charge acceptance and potential discharge models experimental methods photogeneration theories photogneration charge transport theories hole transport electron and bipolar transport photoreceptor summary and concluding remarks.
Journal ArticleDOI
Transient photoconductivity in a discotic liquid crystal.
D. Adam,D. Adam,F. Closs,F. Closs,T. Frey,T. Frey,D. Funhoff,D. Funhoff,D. Haarer,D. Haarer,Peter Schuhmacher,Peter Schuhmacher,K. Siemensmeyer,K. Siemensmeyer +13 more
TL;DR: Using a time-of-flight technique, different transport mechanisms, deep trapping, multiple shallow trapping, and ideal itrinsic transport, can be observed in the different temperature and phase regions of the liquid-crystalline photoconductor hexapentyloxytriphenylene.
Journal ArticleDOI
Fast Hole Transport in a New Calamitic Liquid Crystal of 2-(4′-Heptyloxyphenyl)-6-Dodecylthiobenzothiazole
TL;DR: In this article, the carrier transport in different phases of a new photoconductive calamitic liquid crystal, 2-(4\ensuremath{'}-heptyloxyphenyl)-6-dodecylthiobenzothiazole was studied by the time-of-flight technique.
Journal ArticleDOI
Fiber‐optic evanescent field absorption sensor
Phillip H. Paul,George Kychakoff +1 more
TL;DR: In this paper, the authors measured evanescent field absorption as a function of cladding refractive index and bulk absorption coefficient, and a simple theory for interpreting these results has been developed.
Journal ArticleDOI
Fast ambipolar carrier transport in smectic phases of phenylnaphthalene liquid crystal
TL;DR: In this paper, the carrier transport of a calamitic liquid crystal, i.e., 2-(4′-octylphenyl)6-dodecyloxynaphthalene (8-PNP-O12), was investigated by the time-of-flight technique.