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Themed collection Celebrating 50 years of Professor Fred Wudl’s contributions to the field of organic semiconductors

33 items
Editorial

Fred Wudl's fifty-year contribution to organic semiconductors

Guest editors Qichun Zhang, Dmitrii Perepichka and Zhenan Bao introduce this Journal of Materials Chemistry C themed issue on organic semiconductors, in celebration of Professor Fred Wudl's fifty-year contribution to the field.

Graphical abstract: Fred Wudl's fifty-year contribution to organic semiconductors
Highlight

Organic electronics by design: the power of minor atomic and structural changes

Case studies of minor structural variations highlight the fundamental relationship between structure and function to offer design rules with which to develop the next generation of organic electronic materials.

Graphical abstract: Organic electronics by design: the power of minor atomic and structural changes
Review Article

One-dimensional conjugated polymer nanomaterials for flexible and stretchable electronics

Recent development of one-dimensional conjugated polymer nanomaterials for flexible and stretchable electronics and their perspectives are introduced in this study.

Graphical abstract: One-dimensional conjugated polymer nanomaterials for flexible and stretchable electronics
Review Article

Modification of acenes for n-channel OFET materials

Various strategies to chemically modify acenes for n-channel OFETs are discussed. Such strategies could also be useful for design of efficient n-type organic semiconductors based on other π-systems.

Graphical abstract: Modification of acenes for n-channel OFET materials
Review Article

Development of fullerenes and their derivatives as semiconductors in field-effect transistors: exploring the molecular design

A review to explore how to design fullerenes and their derivatives as semiconductors in field-effect transistors.

Graphical abstract: Development of fullerenes and their derivatives as semiconductors in field-effect transistors: exploring the molecular design
Review Article

Recent advances in organic near-infrared photodiodes

Both broadband and narrowband organic photodetectors can be realized due to the easily tunable optical/electronic properties of organic semiconductors.

Graphical abstract: Recent advances in organic near-infrared photodiodes
Review Article

Recent progress on organic donor–acceptor complexes as active elements in organic field-effect transistors

The recent progress on the methods to prepare donor (D)–acceptor (A) co-crystals and their potential applications in OFETs has been reviewed.

Graphical abstract: Recent progress on organic donor–acceptor complexes as active elements in organic field-effect transistors
Communication

Molecular engineering of phosphacycle-based thermally activated delayed fluorescence materials for deep-blue OLEDs

Deep-blue thermally activated delayed fluorescence materials based on dibenzo-fused phosphacycles are developed.

Graphical abstract: Molecular engineering of phosphacycle-based thermally activated delayed fluorescence materials for deep-blue OLEDs
Open Access Communication

Synthesis, crystal structure, magnetic and electronic properties of the caesium-based transition metal halide Cs3Fe2Br9

A 0D perovskite-related material Cs3Fe2Br9 is shown to have a low bandgap of 1.65 eV and exhibit antiferromagnetic behaviour.

Graphical abstract: Synthesis, crystal structure, magnetic and electronic properties of the caesium-based transition metal halide Cs3Fe2Br9
Paper

Solution-processed broadband polymer photodetectors with a spectral response of up to 2.5 μm by a low bandgap donor–acceptor conjugated copolymer

Solution-processed polymer PDs with a spectral response ranging from 350 nm to 2500 nm.

Graphical abstract: Solution-processed broadband polymer photodetectors with a spectral response of up to 2.5 μm by a low bandgap donor–acceptor conjugated copolymer
Paper

Structure engineering: extending the length of azaacene derivatives through quinone bridges

A novel quinone bridged large azaacene exhibits an electron mobility of 0.22 cm2 V−1 s−1 through molecular stacking structure engineering.

Graphical abstract: Structure engineering: extending the length of azaacene derivatives through quinone bridges
Paper

Naphthalimide end capped anthraquinone based solution-processable n-channel organic semiconductors: effect of alkyl chain engineering on charge transport

A series of electron deficient small molecules using fused anthraquinone and naphthalimide conjugated backbone with different alkyl chain length with lower LUMO for n-channel organic thin film transistor.

Graphical abstract: Naphthalimide end capped anthraquinone based solution-processable n-channel organic semiconductors: effect of alkyl chain engineering on charge transport
Paper

Studies of spin related processes in fullerene C60 devices

We have investigated spin related processes in fullerene C60 devices using a several experimental techniques, which include magnetic field effect of photocurrent and electroluminescence in C60-based diodes; spin polarized carrier injection in C60-based spin-valves; and pure spin current generation in NiFe/C60/Pt trilayer devices.

Graphical abstract: Studies of spin related processes in fullerene C60 devices
Paper

Face-on vs. edge-on: tuning the structure of tetrathiafulvalene monolayers with solvent

Molecular orientation and supramolecular structure of tetrathiafulvalene derivative on graphite can be controlled by the change of deposition solvent, as revealed by scanning probe microscopy study.

Graphical abstract: Face-on vs. edge-on: tuning the structure of tetrathiafulvalene monolayers with solvent
Paper

4,5-Diazafluorene co-oligomers as electron-deficient light-emitting materials and selective fluorescence sensors for mercury(II) cations

4,5-Diazafluorene co-oligomers combine improved electron affinity with strong fluorescence and can be used as electron transporting and light-emitting materials, as well as fluorescent sensors for Hg2+ cations.

Graphical abstract: 4,5-Diazafluorene co-oligomers as electron-deficient light-emitting materials and selective fluorescence sensors for mercury(ii) cations
Paper

Oxidation of rubrene, and implications for device stability

In studying the formation and thermally activated cycloreversion of oxidized rubrene to pristine rubrene, we observed an irreversible, second stage oxidized product. Understanding the formation of the irreversible adduct will help one design more chemically robust rubrene derivatives.

Graphical abstract: Oxidation of rubrene, and implications for device stability
Paper

Tuning electrical properties of phenanthroimidazole derivatives to construct multifunctional deep-blue electroluminescent materials

With enhanced electrical properties, TPAPOPPA can deliver decent efficiencies in non-doped, doped, single-layer, yellow and white OLEDs.

Graphical abstract: Tuning electrical properties of phenanthroimidazole derivatives to construct multifunctional deep-blue electroluminescent materials
Paper

Photophysics and phosphate fluorescence sensing by poly(phenylene ethynylene) conjugated polyelectrolytes with branched ammonium side groups

Conjugated polyelectrolytes (CPEs) have been applied as sensors for various small molecules and ions including biologically important ions.

Graphical abstract: Photophysics and phosphate fluorescence sensing by poly(phenylene ethynylene) conjugated polyelectrolytes with branched ammonium side groups
Paper

Thiacycle-fused benzo[1,2-b:4,5-b′]dithiophenes (BDTs): synthesis, packing, molecular orientation and semiconducting properties

Functionalization of benzo[1,2-b:4,5-b′]dithiophenes (BDTs) with thiacycles to selectively tune the packing, molecular orientation and semiconducting properties is systematically studied.

Graphical abstract: Thiacycle-fused benzo[1,2-b:4,5-b′]dithiophenes (BDTs): synthesis, packing, molecular orientation and semiconducting properties
Paper

3,4-Phenylenedioxythiophenes (PheDOTs) functionalized with electron-withdrawing groups and their analogs for organic electronics

A facile one-pot, microwave-assisted synthesis of novel functionalized arylenedioxythiophenes as promising building blocks for conjugated polymers with tuneable electronic properties is presented.

Graphical abstract: 3,4-Phenylenedioxythiophenes (PheDOTs) functionalized with electron-withdrawing groups and their analogs for organic electronics
Paper

A Friedländer route to 5,7-diazapentacenes

New 5,7-diazapentacene-based materials have been made by means of a Friedländer reaction, which could be promising candidates for optoelectronic applications.

Graphical abstract: A Friedländer route to 5,7-diazapentacenes
Paper

Investigating the effect of heteroatom substitution in 2,1,3-benzoxadiazole and 2,1,3-benzothiadiazole compounds for organic photovoltaics

Subtle changes in the choice of the chalcogen atom in benzochalcogenadiazole ‘small molecules’ can lead to a marked difference in the PCE of bulk heterojunction organic solar cells.

Graphical abstract: Investigating the effect of heteroatom substitution in 2,1,3-benzoxadiazole and 2,1,3-benzothiadiazole compounds for organic photovoltaics
Paper

One step facile synthesis of a novel anthanthrone dye-based, dopant-free hole transporting material for efficient and stable perovskite solar cells

A new dopant free stable HTM using anthanthrone dye has been reported with 11.5% efficiency.

Graphical abstract: One step facile synthesis of a novel anthanthrone dye-based, dopant-free hole transporting material for efficient and stable perovskite solar cells
Paper

Effects of meso-M(PPh3)2Cl (M = Pd, Ni) substituents on the linear and third-order nonlinear optical properties of chalcogenopyrylium-terminated heptamethines in solution and solid states

Pd(PPh3)2Cl groups hinder aggregation and afford promising solid-state NLO properties.

Graphical abstract: Effects of meso-M(PPh3)2Cl (M = Pd, Ni) substituents on the linear and third-order nonlinear optical properties of chalcogenopyrylium-terminated heptamethines in solution and solid states
Paper

A chrysene-based liquid crystalline semiconductor for organic thin-film transistors

Chrysene and [1]benzothieno[3,2-b][1]benzothiophene possess a similar electronic structure, and chrysene is expected to have better semiconductor device performance than BTBT, owing to the stronger electronic couplings.

Graphical abstract: A chrysene-based liquid crystalline semiconductor for organic thin-film transistors
Paper

Excellent n-type light emitters based on AIE-active silole derivatives for efficient simplified organic light-emitting diodes

New robust n-type light emitters are developed from AIE-active silole derivatives, enabling the OLEDs to operate efficiently in a simplified configuration.

Graphical abstract: Excellent n-type light emitters based on AIE-active silole derivatives for efficient simplified organic light-emitting diodes
Paper

Inversion of charge carrier polarity and boosting the mobility of organic semiconducting polymers based on benzobisthiadiazole derivatives by fluorination

The first fluorinated copolymers based on benzobisthiadiazole (BBT) and its derivatives are newly synthesized, which show an inversion of charge carrier polarity and dramatic improvement of the mobility.

Graphical abstract: Inversion of charge carrier polarity and boosting the mobility of organic semiconducting polymers based on benzobisthiadiazole derivatives by fluorination
Paper

Impact of side chain placement on thermal stability of solar cells in thiophene–thiazolothiazole polymers

We study the impact of side chain placement on the thermal stability of solar cells in thiophene–thiazolothiazole polymers.

Graphical abstract: Impact of side chain placement on thermal stability of solar cells in thiophene–thiazolothiazole polymers
Paper

Purely organic materials for extremely simple all-TADF white OLEDs: a new carbazole/oxadiazole hybrid material as a dual-role non-doped light blue emitter and highly efficient orange host

Extremely simple two-color all-TADF WOLEDs with a single-emissive-layer singe-host/dopant system provide a bright future for high-efficiency low-cost vacuum-deposited WOLEDs.

Graphical abstract: Purely organic materials for extremely simple all-TADF white OLEDs: a new carbazole/oxadiazole hybrid material as a dual-role non-doped light blue emitter and highly efficient orange host
Open Access Paper

Thermal behaviour of dicarboxylic ester bithiophene polymers exhibiting a high open-circuit voltage

Polythiophene derivatives with ester side chains enable high open-circuit voltages in polymer–fullerene solar cells. The side chains affect the solubility, thermal properties, tendency to aggregate, and photovoltaic performance by modulating the morphology of the blends.

Graphical abstract: Thermal behaviour of dicarboxylic ester bithiophene polymers exhibiting a high open-circuit voltage
Paper

Connecting two phenazines with a four-membered ring: the synthesis, properties and applications of cyclobuta[1,2-b:3,4-b′]diphenazines

This study puts forth a new π-electron molecular scaffold containing two phenazine moieties connected by a four-membered ring. It exhibits interesting optical and electronic properties and sheds light on the role of the four-membered ring in conjugation.

Graphical abstract: Connecting two phenazines with a four-membered ring: the synthesis, properties and applications of cyclobuta[1,2-b:3,4-b′]diphenazines
Paper

Characterization of the structural, mechanical, and electronic properties of fullerene mixtures: a molecular simulations description

We investigate mixtures of fullerenes and fullerene derivatives, the most commonly used electron accepting materials in organic solar cells, by using a combination of molecular dynamics and density functional theory methods.

Graphical abstract: Characterization of the structural, mechanical, and electronic properties of fullerene mixtures: a molecular simulations description
Paper

4H-1,2,6-Thiadiazine-containing donor–acceptor conjugated polymers: synthesis, optoelectronic characterization and their use in organic solar cells

A 4H-1,2,6-thiadiazine motif as a new acceptor for D–A conjugated polymers.

Graphical abstract: 4H-1,2,6-Thiadiazine-containing donor–acceptor conjugated polymers: synthesis, optoelectronic characterization and their use in organic solar cells
33 items

About this collection

Celebrating 50 years of Professor Fred Wudl’s contributions to the field of organic semiconductors

Guest edited by Qichun Zhang, Nanyang Technological University, Dmitrii Perepichka, McGill University, and Zhenan Bao, Stanford University.

This themed issue of Journal of Materials Chemistry C celebrates fifty years of Professor Fred Wudl’s contributions to the field of organic semiconductors.

Including friends and former co-workers, the issue covers all aspects of organic semiconductors, including experimental and theoretical investigations, properties and applications. 

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