scholarly journals Diketopyrrolopyrrole based organic semiconductors with different numbers of thiophene units: symmetry tuning effect on electronic devices

2018 ◽  
Vol 42 (6) ◽  
pp. 4017-4028 ◽  
Author(s):  
Qian Liu ◽  
Abhijith Surendran ◽  
Krishna Feron ◽  
Sergei Manzhos ◽  
Xuechen Jiao ◽  
...  
Keyword(s):  
Small Molecules ◽  
Organic Semiconductors ◽  
Electronic Devices

Three new DPP small molecules were synthesized and used them in OFET devices.

scholarly journals Global Aromaticity at the Nanoscale

2019 ◽  
Author(s):  
Michel Rickhaus ◽  
Michael Jirasek ◽  
Lara Tejerina ◽  
Henrik Gotfredsen ◽  
Martin D. Peeks ◽  
...  
Keyword(s):  
Small Molecules ◽  
Organic Semiconductors ◽  
Oxidation State ◽  
Single Molecule ◽  
Ring Current ◽  
Electronic Devices ◽  
Three Dimensional ◽  
Average Oxidation State ◽  
Ring Currents ◽  
Cyclic Molecule

<div><p>Aromaticity is an important concept for predicting electronic delocalisation in molecules, particularly for designing organic semiconductors and single-molecule electronic devices. It is most simply defined by the ability of a cyclic molecule to sustain a ring current when placed in a magnetic field. Hückel’s rule states that if a ring has [4n+2] π-electrons, it will be aromatic with an induced magnetisation that opposes the external field inside the ring, whereas if it has 4n π-electrons, it will be antiaromatic with the opposite magnetisation. This rule reliably predicts the behaviour of small molecules, typically with circuits of less than about 22 π-electrons (n = 5). It is not clear whether aromaticity has a size limit and whether Hückel’s rule is valid in much larger macrocycles. Here, we present evidence for global aromaticity in a wide variety of porphyrin nanorings, with circuits of up to 162 π-electrons (n = 40; diameter 5 nm). We show that aromaticity can be controlled by changing the molecular structure, oxidation state and three-dimensional conformation. Whenever a global ring current is observed, its direction is correctly predicted by Hückel’s rule. The magnitude of the current is maximised when the average oxidation state of the porphyrin units is around 0.5–0.7, when the system starts to resemble a conductor with a partially filled valence band. Our results show that aromaticity can arise in large macrocycles, bridging the size gap between ring currents in molecular and mesoscopic rings.</p></div>

scholarly journals Global Aromaticity at the Nanoscale

2019 ◽  
Author(s):  
Michel Rickhaus ◽  
Michael Jirasek ◽  
Lara Tejerina ◽  
Henrik Gotfredsen ◽  
Martin D. Peeks ◽  
...  
Keyword(s):  
Small Molecules ◽  
Organic Semiconductors ◽  
Oxidation State ◽  
Single Molecule ◽  
Ring Current ◽  
Electronic Devices ◽  
Three Dimensional ◽  
Average Oxidation State ◽  
Ring Currents ◽  
Cyclic Molecule

<div><p>Aromaticity is an important concept for predicting electronic delocalisation in molecules, particularly for designing organic semiconductors and single-molecule electronic devices. It is most simply defined by the ability of a cyclic molecule to sustain a ring current when placed in a magnetic field. Hückel’s rule states that if a ring has [4n+2] π-electrons, it will be aromatic with an induced magnetisation that opposes the external field inside the ring, whereas if it has 4n π-electrons, it will be antiaromatic with the opposite magnetisation. This rule reliably predicts the behaviour of small molecules, typically with circuits of less than about 22 π-electrons (n = 5). It is not clear whether aromaticity has a size limit and whether Hückel’s rule is valid in much larger macrocycles. Here, we present evidence for global aromaticity in a wide variety of porphyrin nanorings, with circuits of up to 162 π-electrons (n = 40; diameter 5 nm). We show that aromaticity can be controlled by changing the molecular structure, oxidation state and three-dimensional conformation. Whenever a global ring current is observed, its direction is correctly predicted by Hückel’s rule. The magnitude of the current is maximised when the average oxidation state of the porphyrin units is around 0.5–0.7, when the system starts to resemble a conductor with a partially filled valence band. Our results show that aromaticity can arise in large macrocycles, bridging the size gap between ring currents in molecular and mesoscopic rings.</p></div>

scholarly journals Global Aromaticity at the Nanoscale

2019 ◽  
Author(s):  
Michel Rickhaus ◽  
Michael Jirasek ◽  
Lara Tejerina ◽  
Henrik Gotfredsen ◽  
Martin D. Peeks ◽  
...  
Keyword(s):  
Small Molecules ◽  
Organic Semiconductors ◽  
Oxidation State ◽  
Single Molecule ◽  
Ring Current ◽  
Electronic Devices ◽  
Three Dimensional ◽  
Average Oxidation State ◽  
Ring Currents ◽  
Cyclic Molecule

<div><p>Aromaticity is an important concept for predicting electronic delocalisation in molecules, particularly for designing organic semiconductors and single-molecule electronic devices. It is most simply defined by the ability of a cyclic molecule to sustain a ring current when placed in a magnetic field. Hückel’s rule states that if a ring has [4n+2] π-electrons, it will be aromatic with an induced magnetisation that opposes the external field inside the ring, whereas if it has 4n π-electrons, it will be antiaromatic with the opposite magnetisation. This rule reliably predicts the behaviour of small molecules, typically with circuits of less than about 22 π-electrons (n = 5). It is not clear whether aromaticity has a size limit and whether Hückel’s rule is valid in much larger macrocycles. Here, we present evidence for global aromaticity in a wide variety of porphyrin nanorings, with circuits of up to 162 π-electrons (n = 40; diameter 5 nm). We show that aromaticity can be controlled by changing the molecular structure, oxidation state and three-dimensional conformation. Whenever a global ring current is observed, its direction is correctly predicted by Hückel’s rule. The magnitude of the current is maximised when the average oxidation state of the porphyrin units is around 0.5–0.7, when the system starts to resemble a conductor with a partially filled valence band. Our results show that aromaticity can arise in large macrocycles, bridging the size gap between ring currents in molecular and mesoscopic rings.</p></div>

scholarly journals Functionalization Strategies of PEDOT and PEDOT:PSS Films for Organic Bioelectronics Applications

Chemosensors ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 212
Author(s):  
Gonzalo E. Fenoy ◽  
Omar Azzaroni ◽  
Wolfgang Knoll ◽  
Waldemar A. Marmisollé
Keyword(s):  
Small Molecules ◽  
Conducting Polymer ◽  
Organic Semiconductors ◽  
Synthesis Method ◽  
Polymer Synthesis ◽  
Preparation Methods ◽  
Electrophysiological Signals ◽  
Organic Bioelectronics ◽  
Biological Interfaces ◽  
Living Organisms

Organic bioelectronics involves the connection of organic semiconductors with living organisms, organs, tissues, cells, membranes, proteins, and even small molecules. In recent years, this field has received great interest due to the development of all kinds of devices architectures, enabling the detection of several relevant biomarkers, the stimulation and sensing of cells and tissues, and the recording of electrophysiological signals, among others. In this review, we discuss recent functionalization approaches for PEDOT and PEDOT:PSS films with the aim of integrating biomolecules for the fabrication of bioelectronics platforms. As the choice of the strategy is determined by the conducting polymer synthesis method, initially PEDOT and PEDOT:PSS films preparation methods are presented. Later, a wide variety of PEDOT functionalization approaches are discussed, together with bioconjugation techniques to develop efficient organic-biological interfaces. Finally, and by making use of these approaches, the fabrication of different platforms towards organic bioelectronics devices is reviewed.

Acene-based organic semiconductors for organic light-emitting diodes and perovskite solar cells

2018 ◽  
Vol 6 (33) ◽  
pp. 9017-9029 ◽  
Author(s):  
Hong Duc Pham ◽  
Hongwei Hu ◽  
Fu-Lung Wong ◽  
Chun-Sing Lee ◽  
Wen-Cheng Chen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecules ◽  
Organic Semiconductors ◽  
Light Emitting Diodes ◽  
Perovskite Solar Cells ◽  
Organic Light Emitting Diodes ◽  
Strong Electron ◽  
Light Emitting ◽  
Organic Light

A series of strong electron-rich small molecules based on acenes were designed and synthesized for application in green/blue organic light-emitting diodes and perovskite solar cells.

Green solvent-processed organic electronic devices

2020 ◽  
Vol 8 (43) ◽  
pp. 15027-15047
Author(s):  
Filippo Campana ◽  
Choongik Kim ◽  
Assunta Marrocchi ◽  
Luigi Vaccaro
Keyword(s):  
Thin Film ◽  
Organic Semiconductors ◽  
Organic Photovoltaics ◽  
Thin Film Transistors ◽  
High Performance ◽  
Electronic Devices ◽  
Green Solvents ◽  
Green Solvent ◽  
Organic Electronic Devices ◽  
Organic Electronic

A review on the recent efforts to select green solvents for processing organic semiconductors for thin film transistors (TFT) and organic photovoltaics (OPV) applications. A guide for the safe fabrication of high-performance devices.

The Synthesis, Condensation, and Luminescence of Stilbenoid Oligomers with Alkoxysilane End Groups

2001 ◽  
Vol 665 ◽  
Author(s):  
H. Detert ◽  
E. Sugiono
Keyword(s):  
Small Molecules ◽  
Organic Semiconductors ◽  
Three Dimensional ◽  
Synthetic Route ◽  
Heck Reactions ◽  
Transparent Films ◽  
Cross Metathesis ◽  
Fluorescent Materials ◽  
End Groups ◽  
Hydrolysis Of

ABSTRACTA synthetic route to highly luminescent organic semiconductors with curable alkoxysilyl groups is described. Monodisperse oligo(phenylenevinylene)s are rigidly connected to di- and triethoxysilanes via Heck reactions or via cross-metathesis. Hydrolysis of the silicic esters yields silanols condensing to linear and cyclic oligo-OPV-siloxanes or to three-dimensional networks, thus allowing the transformation of small molecules to fluorescent materials with well-defined chromophores. Transparent films are obtained by casting of soluble cyclosiloxanes and from OPV-silanetriols, the latter can be cured to insoluble networks.

scholarly journals Intrinsically Elastic Organic Semiconductors (IEOSs)

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6130
Author(s):  
Fei Liu ◽  
Xueling Hou ◽  
Ben-Lin Hu ◽  
Run-Wei Li
Keyword(s):  
Organic Synthesis ◽  
Organic Semiconductors ◽  
Structural Engineering ◽  
Electronic Devices ◽  
Synthetic Methods ◽  
Chemical Structures ◽  
Mechanical And Electrical Properties ◽  
Wearable Electronic ◽  
Synthetic Routes ◽  
Wearable Electronic Devices

Elastic semiconductors are becoming more and more important to the development of flexible wearable electronic devices, which can be prepared by structural engineering design, blending, and the intrinsic elastification of organic semiconductors (intrinsically elastic organic semiconductor, IEOS). Compared with the elastic semiconductors prepared by structural engineering and blending, the IEOS prepared by organic synthesis has attracted numerous attentions for its solution processability and highly tunable chemical structures. For IEOSs, reasonable designs of synthetic routes and methods are the basis for realizing good mechanical and electrical properties. This brief review begins with a concise introduction of elastic semiconductors, then follows with several synthetic methods of IEOSs, and concludes the characteristics of each method, which provides guidance for the synthesis of IEOSs in the future. Furthermore, the properties of IEOSs are involved from the aspects of electrical, mechanical properties, and the applications of the IEOSs in elastic electronic devices. Finally, the challenge and an outlook which IEOSs are facing are presented in conclusion.

scholarly journals Tailoring Molecular Weight of Polymer Additives for Organic Semiconductors

2022 ◽  
Author(s):  
Zhengran He ◽  
Ziyang Zhang ◽  
Sheng Bi
Keyword(s):  
Molecular Weight ◽  
Binary System ◽  
Organic Semiconductors ◽  
Organic Semiconductor ◽  
High Performance ◽  
Electronic Devices ◽  
Polymer Additives ◽  
Flexible Substrates ◽  
Polymer Additive

A binary system comprising both an organic semiconductor and a polymer additive has attracted extensive research interests due to great potential for high-performance, solution-proccessable electronic devices on flexible substrates. The...

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