Designing π-conjugated polymers for organic electronics

Guo, Xin; Baumgarten, Martin; Müllen, Kläus

doi:10.1016/j.progpolymsci.2013.09.005

Cited by 757 publications

(626 citation statements)

References 536 publications

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“…9 In particular star polymers have attracted particular attention due to their unique structure and relatively easy synthetic route 9 . They show a range of different behaviours, both in bulk solution and at interfaces, and have found use in areas such as organic electronics 10 and drug delivery 11 . The use of hyper-branched polymers in interfacial science is also becoming popular, as it is generally thought that the presence of side chains should enhance the adhesion and mobility of polymers on interfaces (mainly solid).…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of linear and star polymers at fluid interfaces

2015

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Performing molecular dynamics simulations on model systems we study the structural changes and thermodynamic stability of polymers of varying topology (linear and starshaped) at interface between two liquids. We find that homopolymers are attracted to the interface in both good and poor solvent conditions showing that they are surface active molecules even though not amphiphilic. In most cases changing polymer topology had only a minor effect on the desorption free energy. A noticeable dependence on polymer topology is only seen for relatively high molecular weight polymers at interface between two good solvents. Examining separately the enthalpic and entropic components of the desorption free energy suggests that its largest contribution is the decrease in the interfacial free energy caused by the adsorption of the polymer at the interface. Finally we propose a simple method to qualitatively predict the trend of the interfacial free energy as a function of the polymer molecular weight.2

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Section: Introductionmentioning

confidence: 99%

Thermodynamics of linear and star polymers at fluid interfaces

2015

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“…Nanostructured films of organic materials have played central role in the design of new electronic devices 1 . In this context, perylene derivatives stand out due to their suitable optical and electrical properties besides the low cost of processing in comparison to the conventional semiconducting materials [2][3][4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

Supramolecular Architecture and Electrical Properties of a Perylene Derivative in Physical Vapor Deposited Films

et al. 2015

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The supramolecular structure of organic thin films is a key factor in their optical and electrical properties and, consequently, in the technological applications involving organic electronic. Here, thin films of a perylene derivative, the bis butylimido perylene (BuPTCD), were produced by vacuum thermal evaporation (PVD, physical vapor deposition). The main objective is to investigate the supramolecular structure of the BuPTCD in these PVD films, which implies to control their thickness at nanometer scale and to determine their molecular organization, morphology at micro and nanometer scales and crystallinity. The ultraviolet-visible absorption reveals a uniform growth of the PVD films. The optical and atomic force microscopy images show a homogeneous surface of the film at micro and nanometer scales, respectively. The X-ray diffraction indicates that both powder and PVD film are in the crystalline form. Complementary, a preferential head-on orientation of the molecules in the PVD films is determined via infrared absorption spectroscopy. Besides, the annealing process (200 o C) did not affect the molecular organization of the PVD films, revealing a thermal stability of the BuPTCD molecules within the PVD films. Through DC electrical measurements, an electrical conductivity of 7.45x10 -10 S/m was determined for BuPTCD PVD films onto Au interdigitated electrodes (IDE-structured devices), which can be enhanced, under illumination, by two orders of magnitude (photoconductivity effect). As proof-of-concept, the IDE-structured devices are tested as gas sensor for trifluoroacetic acid.

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“…In recent years, it has been applied in high-mobility organic eld-effect transistors (OFETs), 23,24 highly sensitive ammonia sensors, 25 and also been used as building block of semiconducting polymers. 26,27 These works inspired us to exploit it as a p-spacer to yield new organic dyes for DSSCs. Herein, we report two new D-p-A type organic sensitizers ( Fig.…”

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confidence: 99%