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.

Time-resolved Photoconductivity as a Probe of Carrier Transport in Microcrystalline Silicon

2006 ◽  
Vol 910 ◽  
Author(s):  
Steve Reynolds
Keyword(s):  
Density Of States ◽  
Carrier Mobility ◽  
Carrier Transport ◽  
Film Growth ◽  
Hole Mobility ◽  
Transport Parameters ◽  
Microcrystalline Silicon ◽  
Time Resolved ◽  
Transient Photoconductivity ◽  
Transport Measurements

AbstractThe use of transient photoconductivity techniques in the investigation of carrier transport in microcrystalline silicon is described. Results are presented which highlight variations in transport parameters such as carrier mobility and density of states with structure composition. Hole mobility is significantly enhanced by crystalline content in the film of 10% or less. The density of states inferred from transport measurements parallel to and at right angles to the direction of film growth differ somewhat, suggesting that transport may be anisotropic.

Phase Segregation via Etching-Induced Cation Migration in CoSx-ZnS Nanoarchitectures for Solar Hydrogen Evolution

2022 ◽  
Author(s):  
Zirong Shen ◽  
Junmin Huang ◽  
Junying Chen ◽  
Yingwei Li
Keyword(s):  
Photocatalytic Activity ◽  
Charge Carrier ◽  
Hydrogen Evolution ◽  
Carrier Mobility ◽  
Phase Segregation ◽  
Charge Carrier Mobility ◽  
Charge Carriers ◽  
Solar Hydrogen ◽  
Cation Migration ◽  
Low Charge

Low charge carrier mobility limits the development of highly efficient semiconductor-based photocatalysis. Heterointerface engineering is a promising approach to spatially separate the photoexcited charge carriers and thus enhance photocatalytic activity....

Design Rules to Maximize Charge-Carrier Mobility along Conjugated Polymer Chains

2020 ◽  
Vol 11 (16) ◽  
pp. 6519-6525
Author(s):  
Suryoday Prodhan ◽  
Jing Qiu ◽  
Matteo Ricci ◽  
Otello M. Roscioni ◽  
Linjun Wang ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Conjugated Polymer ◽  
Carrier Mobility ◽  
Charge Carrier Mobility ◽  
Polymer Chains ◽  
Design Rules ◽  
Conjugated Polymer Chains

scholarly journals Population dependence of THz charge carrier mobility and non-Drude-like behavior in short semiconductor nanowires

Nanoscale ◽  
2021 ◽  
Author(s):  
Alexander W. Achtstein ◽  
Nina Owschimikow ◽  
Michael Tiberius Quick
Keyword(s):  
Charge Carrier ◽  
Carrier Mobility ◽  
Charge Carrier Mobility ◽  
Semiconductor Nanowires ◽  
Charge Carriers ◽  
Radiation Absorption ◽  
Thz Radiation

We investigate THz radiation absorption by charge carriers, focusing on the mobility in nanorods and wires. We show that for short rods the mobility is limited by the high spacing...

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

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.

scholarly journals Charge carrier mobility dynamics in organic semiconductors and solar cells

2020 ◽  
Vol 60 (1) ◽  
Author(s):  
Vidmantas Gulbinas
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
Organic Semiconductors ◽  
Organic Solar Cells ◽  
Carrier Mobility ◽  
Charge Carrier Mobility ◽  
Charge Carriers ◽  
Organic Layer ◽  
Stoichiometric Ratio ◽  
Donor And Acceptor

Charge carrier mobility in organic semiconductors is not a constant value unambigously characterizing some particular material, but depends on the electric field, temperature and even on time after it was generated or injected. The time dependence is particularly important for the thin-film devices where charge carriers pass the organic layer before mobility reaching its stationary value. Here we give a review of experimental techniques with ultrafast timeresolution enabling one to address the mobility kinetics and analyse properties of the time-dependent mobility in conjugated polymers and organic solar cells. We analyse kinetics during the charge carrier generation and extraction of free charge carriers. The mobility typically decreases by several orders of magnitude on a picosecond-nanosecond time scale; however, its kinetics also depends on the investigation technique. The mobility kinetics in blends for bulk heterojunction solar cells strongly depends on the stoichiometric ratio of donor and acceptor materials.

scholarly journals Charge carrier transport and recombination in disordered materials

2016 ◽  
Vol 56 (3) ◽  
pp. 182-189 ◽  
Author(s):  
Gytis Juška ◽  
Kęstutis Arlauskas ◽  
Kristijonas Genevičius
Keyword(s):  
Charge Carrier ◽  
Carrier Transport ◽  
Bulk Heterojunction ◽  
Charge Carrier Mobility ◽  
Thin Layers ◽  
Charge Carriers ◽  
Disordered Materials ◽  
Charge Carrier Transport ◽  
Bulk Heterojunctions ◽  
The Impact

In this brief review the methods for investigation of charge carrier transport and recombination in thin layers of disordered materials and the obtained results are discussed. The method of charge carrier extraction by linearly increasing voltage (CELIV) is useful for the determination of mobility, bulk conductivity and density of equilibrium charge carriers. The extraction of photogenerated charge carriers (photo-CELIV) allows one to independently investigate relaxation of both the mobility and density of photogenerated charge carriers. The extraction of injected charge carriers (i-CELIV) is effective for the independent investigation of transport peculiarities of both injected holes and electrons in bulk heterojunctions. For the investigation of charge carrier recombination we proposed integral time-of-flight (TOF) and double-injection (DI) current transient methods. The methods allowed us to obtain the following significant results: to determine the reason of the conductivity dependence on electric field strength and temperature in the amorphous and microcrystalline hydrogenated silicon and π-conjugated polymers, the time dependent Langevin recombination, the impact of morphology on charge carrier mobility, the reason of reduced Langevin recombination in RR-PHT (regioregular poly(3-hexylthiophene))/PCBM (1-(3-methoxycarbonyl)propyl-1phenyl-[6,6]-methanofullerene) bulk heterojunction structures – 2D Langevin recombination; and to evaluate that the mobility of holes is predetermined by off-diagonal dispersion in poly-PbO.

Charge carrier mobility in one-dimensional aligned π-stacks of conjugated small molecules with a benzothiadiazole central unit

2017 ◽  
Vol 19 (12) ◽  
pp. 8330-8339 ◽  
Author(s):  
Deyan Raychev ◽  
Olga Guskova
Keyword(s):  
Charge Carrier ◽  
Small Molecules ◽  
Carrier Mobility ◽  
Charge Carrier Mobility ◽  
Charge Carriers ◽  
Central Unit ◽  
Dft Methods ◽  
Crystalline Materials ◽  
One Dimensional ◽  
Mobility Of Charge Carriers

The hopping mobility of charge carriers in organic crystalline materials consisting of benzothiadiazole-cored molecules with thiophene or furan flanks was analyzed using DFT methods.

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