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Organic Electronic Materials
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Organic Electronic Materials

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (31 January 2010) | Viewed by 73029

Special Issue Editor

Prof. Dr. Johannes Gierschner

E-Mail Website
Guest Editor
Madrid Institute for Advanced Studies IMDEA in Nanoscience C/ Faraday 9 Ciudad Universitaria de Cantoblanco 28049, Madrid, Spain
Interests: conjugated organic materials; organic optoelectronics; optical spectroscopy; quantum chemistry

Special Issue Information

Dear Colleagues,

Since the discovery of conducting polymers more than forty years ago, organic electronic materials are making their way to everyday\'s life, promising tunable, cheap and flexible materials for displays, lighting, solar panels and microchips. To improve the performance in these devices, several processes have to be optimized, i.e optical absorption, exciton diffusion, charge generation, recombination and transport. These processes are governed by the electronic nature of the film-constituting molecules as well as by their mutual arrangement, which in turn is controlled by the intra-molecular geometrical and electronic properties. A full understanding of these processes to exploit the richness of organic synthesis thus demands intense collaboration of material science, theory, spectroscopy, device physics and engineering.

To reflect the latest developments in the field, we feature a special issue on "Organic Electronic Materials", covering different aspects like synthesis, characterization, processes and devices.

Johannes Gierschner, Ph. D.
Guest Editor

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Published Papers (6 papers)

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Research

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646 KiB  
Article
Computational Study of Ferrocene-Based Molecular Frameworks with 2,5-Diethynylpyridine as a Chemical Bridge
by Feizhi Ding, Shaowei Chen and Haobin Wang
Materials 2010, 3(4), 2668-2683; https://doi.org/10.3390/ma3042668 - 13 Apr 2010
Cited by 39 | Viewed by 10366
Abstract
A computational study was carried out to examine the electronic and optical properties of the experimentally proposed ferrocene-based molecular diode that used 2,5-diethynylpyridine as a bridging unit. Density functional theory, time-dependent density functional theory, and constrained density functional theory were applied to investigate [...] Read more.
A computational study was carried out to examine the electronic and optical properties of the experimentally proposed ferrocene-based molecular diode that used 2,5-diethynylpyridine as a bridging unit. Density functional theory, time-dependent density functional theory, and constrained density functional theory were applied to investigate various aspects of the underlying electron transfer mechanism. The results not only advance our understanding of the experimental observations, but also demonstrate the usefulness of computational approaches for the design of new electronic materials. Full article
(This article belongs to the Special Issue Organic Electronic Materials)
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641 KiB  
Article
A Mechanism of DC-AC Conversion in the Organic Thyristor
by Tomohiro Suko, Ichiro Terasaki, Hatsumi Mori and Takehiko Mori
Materials 2010, 3(3), 2027-2036; https://doi.org/10.3390/ma3032027 - 19 Mar 2010
Cited by 7 | Viewed by 9093
Abstract
The charge ordered organic salt θ-(BEDT-TTF)2CsZn(SCN)4 exhibits a giant nonlinear conduction at low temperatures. The voltage-current characteristics of this compound are similar to those of a thyristor device, after which we named it the organic thyristor. This material shows [...] Read more.
The charge ordered organic salt θ-(BEDT-TTF)2CsZn(SCN)4 exhibits a giant nonlinear conduction at low temperatures. The voltage-current characteristics of this compound are similar to those of a thyristor device, after which we named it the organic thyristor. This material shows current oscillation in the presense of dc voltage, which arises from a mechanism different from conventional oscillating circuits, because the oscillation appears in a sample that does not show negative derivative resistance. We have performed a standard circuit analysis, and show that the voltage-current curve is “blurred” in the high current region, and the oscillation occurs in the blurred region. This type of oscillation has never been reported, and a possible origin for this is suggested. Full article
(This article belongs to the Special Issue Organic Electronic Materials)
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Review

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815 KiB  
Review
Charge-Transfer Interactions in Organic Functional Materials
by Hsin-Chieh Lin and Bih-Yaw Jin
Materials 2010, 3(8), 4214-4251; https://doi.org/10.3390/ma3084214 - 5 Aug 2010
Cited by 19 | Viewed by 11614
Abstract
Our goal in this review is three-fold. First, we provide an overview of a number of quantum-chemical methods that can abstract charge-transfer (CT) information on the excited-state species of organic conjugated materials, which can then be exploited for the understanding and design of [...] Read more.
Our goal in this review is three-fold. First, we provide an overview of a number of quantum-chemical methods that can abstract charge-transfer (CT) information on the excited-state species of organic conjugated materials, which can then be exploited for the understanding and design of organic photodiodes and solar cells at the molecular level. We stress that the Composite-Molecule (CM) model is useful for evaluating the electronic excited states and excitonic couplings of the organic molecules in the solid state. We start from a simple polyene dimer as an example to illustrate how interchain separation and chain size affect the intercahin interaction and the role of the charge transfer interaction in the excited state of the polyene dimers. With the basic knowledge from analysis of the polyene system, we then study more practical organic materials such as oligophenylenevinylenes (OPVn), oligothiophenes (OTn), and oligophenylenes (OPn). Finally, we apply this method to address the delocalization pathway (through-bond and/or through-space) in the lowest excited state for cyclophanes by combining the charge-transfer contributions calculated on the cyclophanes and the corresponding hypothetical molecules with tethers removed. This review represents a step forward in the understanding of the nature of the charge-transfer interactions in the excited state of organic functional materials. Full article
(This article belongs to the Special Issue Organic Electronic Materials)
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459 KiB  
Review
Fluorinated Poly(p-phenylenevinylene)s: Synthesis and Optical Properties of an Intriguing Class of Luminescent Polymers
by Gianluca M. Farinola, Antonio Cardone, Francesco Babudri, Carmela Martinelli, Francesco Naso, Giovanni Bruno and Maria Losurdo
Materials 2010, 3(5), 3077-3091; https://doi.org/10.3390/ma3053077 - 7 May 2010
Cited by 26 | Viewed by 12392
Abstract
This review is an overview of our previous work on the synthesis and properties of poly(p-phenylenevinylene)s (PPVs) selectively fluorinated in different positions of the conjugated backbone. Both the synthetic challenges and the effects of functionalization with fluorine atoms on the optical [...] Read more.
This review is an overview of our previous work on the synthesis and properties of poly(p-phenylenevinylene)s (PPVs) selectively fluorinated in different positions of the conjugated backbone. Both the synthetic challenges and the effects of functionalization with fluorine atoms on the optical behavior are discussed, highlighting the peculiarities and the interest of this class of conjugated polymers. A general polymerization protocol for PPVs, that is based on the Pd-catalyzed Stille cross-coupling reaction of bis-stannylated vinylene monomers with aromatic bis-halides, has been successfully extended to the synthesis of selectively fluorinated poly(p-phenylenevinylene)s. The properties of a series of these PPVs differing in the number and positions of the fluorine atoms on the conjugated backbone have been studied, even in comparison with the non-fluorinated counterparts. The intriguing optical features of the resulting materials are discussed considering not only the role of the electronic and steric effects induced by the fluorine substituents, but also the impact of the fluorination on the solid state organization and intermolecular interactions. Full article
(This article belongs to the Special Issue Organic Electronic Materials)
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3370 KiB  
Review
New Development in the Preparation of Micro/Nano-Wires of Molecular (Magnetic) Conductors
by Toyonari Sugimoto, Hisashi Tanaka, Dominique De Caro and Lydie Valade
Materials 2010, 3(3), 1640-1673; https://doi.org/10.3390/ma3031640 - 8 Mar 2010
Cited by 9 | Viewed by 13191
Abstract
A lot of molecular (magnetic) conductors are prepared largely using charge-transfer (CT) salts of donor molecules with acceptor molecules or nonmagnetic or magnetic anions such as metal halides and oxides; their CT salts are usually obtained as bulk crystals, which are used to [...] Read more.
A lot of molecular (magnetic) conductors are prepared largely using charge-transfer (CT) salts of donor molecules with acceptor molecules or nonmagnetic or magnetic anions such as metal halides and oxides; their CT salts are usually obtained as bulk crystals, which are used to elucidate the electrical conducting (magnetic) properties. In contrast, a small number of micro/nano-crystals of the molecular (magnetic) conductors, especially micro/nano-wires, are known, of which highly conducting nanowires are necessary as a key component in the development of the next generation of nano-size transistors and spin-transistors. Very recently, we succeeded in preparing highly conductive micro/nano-wires of CT salts between bent donor molecules developed by one of the author’s group and magnetic FeX4– (X = Cl, Br) ions: (1) by electrochemical oxidation of the bent donor molecules with a silicon wafer electrode coated with a phospholipid multi-lamellar structure as well as, (ii) by electrochemical oxidation of the bent donor molecules with a large arc structure, in the presence of NBu4FeX4 supporting electrolytes. This article reviews template-free and template-assisted methods developed so far for the preparation of micro/nano-wires of molecular (magnetic) conductors along with our new methods. The conducting properties of these micro/nano-wires are compared with those of the corresponding bulk crystals. Full article
(This article belongs to the Special Issue Organic Electronic Materials)
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970 KiB  
Review
Azine- and Azole-Functionalized Oligo´ and Polythiophene Semiconductors for Organic Thin-Film Transistors
by Rocío Ponce Ortiz, He Yan, Antonio Facchetti and Tobin J. Marks
Materials 2010, 3(3), 1533-1558; https://doi.org/10.3390/ma3031533 - 3 Mar 2010
Cited by 34 | Viewed by 15281
Abstract
In the organic electronics research field, several strategies have been used to modulate the transport properties of thiophene-derived semiconductors via sequential functionalization of their π-conjugated cores. This review summarizes the major design and synthetic strategies for tuning thiophene-containing small molecule and polymer properties [...] Read more.
In the organic electronics research field, several strategies have been used to modulate the transport properties of thiophene-derived semiconductors via sequential functionalization of their π-conjugated cores. This review summarizes the major design and synthetic strategies for tuning thiophene-containing small molecule and polymer properties by introducing electron-deficient nitrogen-containing azine and azole moieties. Several examples are presented which elucidate the structural, optical, and electronic consequences of incorporating these electron-deficient fragments in the conjugated skeletons, particularly relating to applications in organic thin-film transistors. Full article
(This article belongs to the Special Issue Organic Electronic Materials)
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