Significant dependence of morphology and charge carrier mobility on substrate surface chemistry in high performance polythiophene semiconductor films

2007 ◽  
Vol 90 (6) ◽  
pp. 062117 ◽  
Author(s):  
R. Joseph Kline ◽  
Dean M. DeLongchamp ◽  
Daniel A. Fischer ◽  
Eric K. Lin ◽  
Martin Heeney ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Surface Chemistry ◽  
High Performance ◽  
Carrier Mobility ◽  
Substrate Surface ◽  
Charge Carrier Mobility ◽  
Semiconductor Films ◽  
Significant Dependence

scholarly journals Orientation analysis of pentacene molecules in organic field-effect transistor devices using polarization-dependent Raman spectroscopy

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Bishwajeet Singh Bhardwaj ◽  
Takeshi Sugiyama ◽  
Naoko Namba ◽  
Takayuki Umakoshi ◽  
Takafumi Uemura ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Charge Carrier ◽  
Molecular Orientation ◽  
Field Effect ◽  
High Performance ◽  
Carrier Mobility ◽  
Field Effect Transistors ◽  
Charge Carrier Mobility ◽  
Orientation Distribution ◽  
High Resolution Technique

Abstract Pentacene, an organic molecule, is a promising material for high-performance field effect transistors due to its high charge carrier mobility in comparison to usual semiconductors. However, the charge carrier mobility is strongly dependent on the molecular orientation of pentacene in the active layer of the device, which is hard to investigate using standard techniques in a real device. Raman scattering, on the other hand, is a high-resolution technique that is sensitive to the molecular orientation. In this work, we investigated the orientation distribution of pentacene molecules in actual transistor devices by polarization-dependent Raman spectroscopy and correlated these results with the performance of the device. This study can be utilized to understand the distribution of molecular orientation of pentacene in various electronic devices and thus would help in further improving their performances.

Cleaning of III-V Materials: Surface Chemistry Considerations

2012 ◽  
Vol 195 ◽  
pp. 98-99 ◽  
Author(s):  
Dennis H. van Dorp ◽  
Daniel Cuypers ◽  
Sophia Arnauts ◽  
Paul W. Mertens ◽  
Stefan de Gendt
Keyword(s):  
Charge Carrier ◽  
Surface Chemistry ◽  
Carrier Mobility ◽  
Compound Semiconductors ◽  
Charge Carrier Mobility ◽  
Group Iii ◽  
Acidic Solutions ◽  
Chemical Solutions ◽  
Wet Chemical ◽  
High Charge Carrier Mobility

Compound semiconductors based on group III and V elements of the periodic system have high charge carrier mobility and are, therefore, candidates for channel material in future CMOS devices [1]. In order to design wet chemical solutions that lead to appropriate surface pre-conditioning and allow for nanoscale processing and minimal substrate loss, a thorough understanding of the interactions between the substrate and the chemical solutions is needed and the basic etching mechanisms needs to be resolved. The focus of this research is on InP in acidic solutions. ESH aspects are also considered.

A bowl-shaped sumanene derivative with dense convex–concave columnar packing for high-performance organic field-effect transistors

2017 ◽  
Vol 53 (83) ◽  
pp. 11407-11409 ◽  
Author(s):  
Beibei Fu ◽  
Xueqing Hou ◽  
Cong Wang ◽  
Yu Wang ◽  
Xiaotao Zhang ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Single Crystal ◽  
Field Effect ◽  
High Performance ◽  
Carrier Mobility ◽  
Field Effect Transistors ◽  
Charge Carrier Mobility ◽  
Organic Field Effect Transistors ◽  
Crystal Field Effect ◽  
First Time

The charge carrier mobility of a sumanene derivative was probed using single-crystal field-effect transistors for the first time.

Measurement of the Charge Carrier Mobility in MEH-PPV and MEH-PPV-POSS Organic Semiconductor Films

2015 ◽  
Vol 57 (11) ◽  
pp. 1584-1592 ◽  
Author(s):  
I. V. Romanov ◽  
A. V. Voitsekhovskii ◽  
K. M. Dyagterenko ◽  
T. N. Kopylova ◽  
A. P. Kokhanenko ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Organic Semiconductor ◽  
Carrier Mobility ◽  
Charge Carrier Mobility ◽  
Semiconductor Films

Electron transporting organic materials with an exceptional large scale homeotropic molecular orientation

2016 ◽  
Vol 18 (12) ◽  
pp. 8554-8560 ◽  
Author(s):  
Huan Zhao ◽  
Zhiqun He ◽  
Min Xu ◽  
Chunjun Liang ◽  
Sandeep Kumar
Keyword(s):  
Charge Carrier ◽  
Molecular Orientation ◽  
Carrier Mobility ◽  
Large Scale ◽  
Organic Materials ◽  
Substrate Surface ◽  
Charge Carrier Mobility ◽  
Anthraquinone Derivative ◽  
Homeotropic Alignment

An electron transporting anthraquinone derivative demonstrated a stable large-scale homeotropic alignment on an open substrate surface, which substantially improved its charge carrier mobility.

scholarly journals Nanoporous and nonporous conjugated donor–acceptor polymer semiconductors for photocatalytic hydrogen production

2021 ◽  
Vol 12 ◽  
pp. 607-623
Author(s):  
Zhao-Qi Sheng ◽  
Yu-Qin Xing ◽  
Yan Chen ◽  
Guang Zhang ◽  
Shi-Yong Liu ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Electronic Properties ◽  
High Performance ◽  
Carrier Mobility ◽  
Material Design ◽  
Charge Carrier Mobility ◽  
Polymer Semiconductors ◽  
Optical And Electronic Properties ◽  
Donor Acceptor ◽  
Catalytic Mechanisms

Conjugated polymers (CPs) as photocatalysts have evoked substantial interest. Their geometries and physical (e.g., chemical and thermal stability and solubility), optical (e.g., light absorption range), and electronic properties (e.g., charge carrier mobility, redox potential, and exciton binding energy) can be easily tuned via structural design. In addition, they are of light weight (i.e., mainly composed of C, N, O, and S). To improve the photocatalytic performance of CPs and better understand the catalytic mechanisms, many strategies with respect to material design have been proposed. These include tuning the bandgap, enlarging the surface area, enabling more efficient separation of electron–hole pairs, and enhancing the charge carrier mobility. In particular, donor–acceptor (D–A) polymers were demonstrated as a promising platform to develop high-performance photocatalysts due to their easily tunable bandgaps, high charge carrier mobility, and efficient intramolecular charge transfer. In this minireview, recent advances of D–A polymers in photocatalytic hydrogen evolution are summarized with a particular focus on modulating the optical and electronic properties of CPs by varying the acceptor units. The challenges and prospects associated with D–A polymer-based photocatalysts are described as well.

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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