Charge transport in phenazine-fused triphenylene discotic mesogens doped with CdS nanowires

2020 ◽  
Vol 44 (35) ◽  
pp. 14872-14878
Author(s):  
Asmita Shah ◽  
Benoit Duponchel ◽  
Ashwathanarayana Gowda ◽  
Sandeep Kumar ◽  
Matthieu Becuwe ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Charge Transport ◽  
Temperature Dependent ◽  
Discotic Liquid Crystal ◽  
Cds Nanowires ◽  
Discotic Mesogens

We report the synthesis of oleylamine capped CdS nanowires and we have dispersed a small optimized amount of these NWs in the Colh phase of a recently synthesized phenazine-fused-triphenylene discotic liquid crystal to understand the temperature-dependent charge transport.

scholarly journals 3D Charge Transport Pathway in Organic Solar Cells via Incorporation of Discotic Liquid Crystal Columns

Solar RRL ◽  
2020 ◽  
Vol 4 (5) ◽  
pp. 2070056
Author(s):  
Tong Wang ◽  
Meng-Si Niu ◽  
Jia-Jia Guo ◽  
Kang-Ning Zhang ◽  
Zhen-Chuan Wen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Liquid Crystal ◽  
Charge Transport ◽  
Organic Solar Cells ◽  
Transport Pathway ◽  
Discotic Liquid Crystal

scholarly journals Substrate Induced Polymorphism in Organic Thin Films

2014 ◽  
Vol 70 (a1) ◽  
pp. C728-C728
Author(s):  
Basab Chattopadhyay ◽  
Yves Geerts
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Liquid Crystal ◽  
Charge Transport ◽  
Field Effect Transistors ◽  
Crystal Packing ◽  
Morphological Changes ◽  
Solid Substrate ◽  
Experimental Proof ◽  
Discotic Liquid Crystal

The presence of substrate induced polymorphic phases in thin films is an intriguing phenomenon with the physical and chemical factors responsible for its formation are not yet clearly understood. In particular, this is really crucial in the field of organic electronics, where the charge-transport properties are highly dependent on crystal packing, especially for organic field-effect transistors where charge transport occurs at the interface between the organic semiconductor and the dielectric. In pharmaceutical sector, thin film drug delivery is the new emerging alternative to traditional tablets and oral suspensions. The need to identify and control polymorphism induced by the substrate is thus very crucial. In this presentation, we report the structure and morphological changes associated with a substrate induced polymorphic phases in a discotic liquid crystal and a rod shaped DPP-thiophene-based molecule [1, 2]. The bulk compound and the thin films are characterized by a combination of various X-ray diffraction methods to investigate the structural properties. Atomic force microscopy and polarized optical microscopy are used to determine the thin film morphologies. This is the first experimental proof of presence of a substrate induced phase in discotic liquid crystal showcasing an unique example where the 2-D liquid crystalline phase converts to a 3-D crystal plastic phase due to nucleation caused by the solid substrate over a time scale of a month or longer. The presentation also highlights the importance of polymorphism in DPP-thiophene-based material and the specific organization that could arise from the interaction with the substrate depending on the growing conditions. Here the exact structural and the spectroscopic signatures of different polymorphic forms in bulk and in thin films could be identified. These are clearly factors to consider to induce the formation of a particular polymorph and to help to design deposition methodologies.

scholarly journals Charge transport properties of a metal-free phthalocyanine discotic liquid crystal

2006 ◽  
Vol 7 (6) ◽  
pp. 495-499 ◽  
Author(s):  
C. Deibel ◽  
D. Janssen ◽  
P. Heremans ◽  
V. De Cupere ◽  
Y. Geerts ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Charge Transport ◽  
Transport Properties ◽  
Metal Free ◽  
Discotic Liquid Crystal

Conformation, Defects, and Dynamics of a Discotic Liquid Crystal and Their Influence on Charge Transport

2011 ◽  
Vol 115 (47) ◽  
pp. 13809-13816 ◽  
Author(s):  
Lucas A. Haverkate ◽  
Mohamed Zbiri ◽  
Mark R. Johnson ◽  
Bruno Deme ◽  
Fokko M. Mulder ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Charge Transport ◽  
Discotic Liquid Crystal

Correction to “Conformation, Defects, and Dynamics of a Discotic Liquid Crystal and Their Influence on Charge Transport”

2012 ◽  
Vol 116 (12) ◽  
pp. 3908-3908 ◽  
Author(s):  
Lucas A. Haverkate ◽  
Mohamed Zbiri ◽  
Mark R. Johnson ◽  
Bruno Deme ◽  
Fokko M. Mulder ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Charge Transport ◽  
Discotic Liquid Crystal

3D Charge Transport Pathway in Organic Solar Cells via Incorporation of Discotic Liquid Crystal Columns

Solar RRL ◽  
2020 ◽  
Vol 4 (5) ◽  
pp. 2000047 ◽  
Author(s):  
Tong Wang ◽  
Meng-Si Niu ◽  
Jia-Jia Guo ◽  
Kang-Ning Zhang ◽  
Zhen-Chuan Wen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Liquid Crystal ◽  
Charge Transport ◽  
Organic Solar Cells ◽  
Transport Pathway ◽  
Discotic Liquid Crystal

scholarly journals Temperature Characterization of Liquid Crystal Dielectric Image Line Phase Shifter for Millimeter-Wave Applications

Crystals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 63
Author(s):  
Henning Tesmer ◽  
Rani Razzouk ◽  
Ersin Polat ◽  
Dongwei Wang ◽  
Rolf Jakoby ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Millimeter Wave ◽  
Insertion Loss ◽  
Phase Shifter ◽  
Ground Plane ◽  
Temperature Dependent ◽  
Differential Phase ◽  
Dependent Behavior ◽  
The Impact ◽  
Temperature Dependent Behavior

In this paper we investigate the temperature dependent behavior of a liquid crystal (LC) loaded tunable dielectric image guide (DIG) phase shifter at millimeter-wave frequencies from 80 GHz to 110 GHz for future high data rate communications. The adhesive, necessary for precise fabrication, is analyzed before temperature dependent behavior of the component is shown, using the nematic LC-mixture GT7-29001. The temperature characterization is conducted by changing the temperature of the LC DIG’s ground plane between −10∘C and 80 ∘C. The orientation of the LC molecules, and therefore the effective macroscopic relative permittivity of the DIG, is changed by inserting the temperature setup in a fixture with rotatable magnets. Temperature independent matching can be observed, while the insertion loss gradually increases with temperature for both highest and lowest permittivity of the LC. At 80 ∘C the insertion loss is up to 1.3dB higher and at −10∘C it is 0.6dB lower than the insertion loss present at 20 ∘C. In addition, the achievable differential phase is reduced with increasing temperature. The impact of molecule alignment to this reduction is shown for the phase shifter and an estimated 85% of the anisotropy is still usable with an LC DIG phase shifter when increasing the temperature from 20 ∘C to 80 ∘C. Higher reduction of differential phase is present at higher frequencies as the electrical length of the phase shifter increases. A maximum difference in differential phase of 72∘ is present at 110 GHz, when increasing the temperature from 20 ∘C to 80 ∘C. Nevertheless, a well predictable, quasi-linear behavior can be observed at the covered temperature range, highlighting the potential of LC-based dielectric components at millimeter wave frequencies.

Synthesis and mesomorphism of diacetylene-bridged triphenylene discotic liquid crystal dimers

2009 ◽  
Vol 52 (7) ◽  
pp. 975-985 ◽  
Author(s):  
Hong Ji ◽  
KeQing Zhao ◽  
WenHao Yu ◽  
BiQin Wang ◽  
Pin Hu
Keyword(s):  
Liquid Crystal ◽  
Discotic Liquid Crystal

scholarly journals Tailoring Pore Size and Chemical Interior of near 1 nm Sized Pores in a Nanoporous Polymer Based on a Discotic Liquid Crystal

2017 ◽  
Vol 50 (7) ◽  
pp. 2777-2783 ◽  
Author(s):  
Subham Bhattacharjee ◽  
Jody A. M. Lugger ◽  
Rint P. Sijbesma
Keyword(s):  
Liquid Crystal ◽  
Pore Size ◽  
Discotic Liquid Crystal
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