Modulation and evaluation of the charge carrier mobility in a polymer alloy of polythiophene and an insulating matrix with an electron accepting molecule

2015 ◽  
Vol 6 (32) ◽  
pp. 5860-5868 ◽  
Author(s):  
Takahiro Fukumatsu ◽  
Akinori Saeki ◽  
Shu Seki
Keyword(s):  
Charge Carrier ◽  
Absorption Spectroscopy ◽  
Carrier Mobility ◽  
Charge Carrier Mobility ◽  
Direct Access ◽  
Microwave Conductivity ◽  
Time Resolved ◽  
Polymer Alloy ◽  
Contact Measurements

Non-contact measurements with time-resolved microwave conductivity and absorption spectroscopy offer direct access to the charge carrier mobility in conjugated backbones.

Charge carrier mobility in poly[methyl(phenyl)silylene] studied by time-resolved terahertz spectroscopy and molecular modelling

2011 ◽  
Vol 13 (7) ◽  
pp. 2850-2856 ◽  
Author(s):  
Hynek Němec ◽  
Irena Kratochvílová ◽  
Petr Kužel ◽  
Jakub Šebera ◽  
Anna Kochalska ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Molecular Modelling ◽  
Carrier Mobility ◽  
Terahertz Spectroscopy ◽  
Charge Carrier Mobility ◽  
Time Resolved ◽  
Methyl Phenyl

scholarly journals Effects of Molecular Structure on Intramolecular Charge Carrier Transport in Dithieno [3,2-b: -d] Pyrrole-Based Conjugated Copolymers

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Yoshihito Honsho ◽  
Akinori Saeki ◽  
Shu Seki
Keyword(s):  
Charge Carrier ◽  
Conjugated Polymer ◽  
Carrier Mobility ◽  
Carrier Transport ◽  
Hole Mobility ◽  
Charge Carrier Mobility ◽  
Charge Carriers ◽  
Coupling Reactions ◽  
Time Resolved ◽  
Yamamoto Coupling

Intramolecular mobility of positive charge carriers in conjugated polymer films based on dithieno [2,3-b: -d] pyrrole (DTP) is studied by time-resolved microwave conductivity (TRMC). A series of DTP homopolymer and copolymers combined with phenyl, 2,-biphenyl, thiophene, 2,-bithiophene, and 9,-dioctylfluorene were synthesized by Suzuki-Miyaura and Yamamoto coupling reactions. Polymers containing DTP unit are reported to show high value of hole mobility measured by FET method, and this type of polymers is expected to have stable HOMO orbitals which are important for hole transportation. Among these copolymers, DTP coupled with 9,-dioctylfluorene copolymer showed the highest charge carrier mobility as high as 1.7 cm2/Vs, demonstrating an excellent electrical property on rigid copolymer backbones.

Mesomorphic phthalocyanines, tetraazaporphyrins, porphyrins and triphenylenes as charge-transporting materials

2000 ◽  
Vol 04 (01) ◽  
pp. 88-102 ◽  
Author(s):  
H. EICHHORN
Keyword(s):  
Charge Carrier ◽  
Carrier Mobility ◽  
Charge Carrier Mobility ◽  
Point Of View ◽  
Time Resolved ◽  
Homeotropic Alignment ◽  
Flight Measurements ◽  
High Charge Carrier Mobility ◽  
Very High ◽  
Potential Use

The columnar mesomorphism of triphenylene-, phthalocyanine-, tetraazaporphyrin- and porphyrin-based compounds is briefly reviewed and the potential use of this particular supramolecular structure for charge-conducting devices is discussed. Suitably substituted triphenylenes exhibit ideal material properties for photoconducting devices, and well-aligned layers have been shown to give a very high charge carrier mobility of 0.1 × 10-4 m 2 V -1 s -1 (time-of-flight measurements). From a molecular point of view, porphyrin systems should be superior to triphenylenes, but the properties of their mesophases do not support the advantageous homeotropic alignment of the columnar stacks. However, pulse radiolysis time-resolved microwave conductivity measurements revealed the highest charge carrier mobility value of 0.28 × 10-4 m 2 V -1 s -1 for mesomorphic phthalocyanines.

The Influence of Nitrogen Position on Charge Carrier Mobility in Enantiopure Aza[6]helicene Crystals

2018 ◽  
Author(s):  
Francesco Salerno ◽  
Beth Rice ◽  
Julia Schmidt ◽  
Matthew J. Fuchter ◽  
Jenny Nelson ◽  
...  
Keyword(s):  
Solid State ◽  
Charge Carrier ◽  
Carrier Mobility ◽  
Chemical Structure ◽  
Crystal Packing ◽  
Charge Carrier Mobility ◽  
Individual Factor ◽  
Charge Mobility ◽  
Order Of Magnitude ◽  
Small Change

<p>The properties of an organic semiconductor are dependent on both the chemical structure of the molecule involved, and how it is arranged in the solid-state. It is challenging to extract the influence of each individual factor, as small changes in the molecular structure often dramatically change the crystal packing and hence solid-state structure. Here, we use calculations to explore the influence of the nitrogen position on the charge mobility of a chiral organic molecule when the crystal packing is kept constant. The transfer integrals for a series of enantiopure aza[6]helicene crystals sharing the same packing were analysed in order to identify the best supramolecular motifs to promote charge carrier mobility. The regioisomers considered differ only in the positioning of the nitrogen atom in the aromatic scaffold. The simulations showed that even this small change in the chemical structure has a strong effect on the charge transport in the crystal, leading to differences in charge mobility of up to one order of magnitude. Some aza[6]helicene isomers that were packed interlocked with each other showed high HOMO-HOMO integrals (up to 70 meV), whilst molecules arranged with translational symmetry generally afforded the highest LUMO-LUMO integrals (40 - 70 meV). As many of the results are not intuitively obvious, a computational approach provides additional insight into the design of new semiconducting organic materials.</p>

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