Photocarrier generation and transport in<i>σ</i>-bonded polysilanes

Kepler, R. G.; Zeigler, John M.; Harrah, L. A.; Kurtz, S. R.

doi:10.1103/physrevb.35.2818

Cited by 395 publications

(135 citation statements)

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“…1. Temperature dependence of free-volume fraction for PMPrS (1). Closed and open circles show heating and cooling processes, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Free-volume Characterization of Polysilanes Using Positron Annihilation Spectroscopy.

Tashiro

Seki

Pujari

et al. 1999

J. Photopol. Sci. Technol.

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“…1. Temperature dependence of free-volume fraction for PMPrS (1). Closed and open circles show heating and cooling processes, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Polysilanes have attracted considerable attention due to their interesting physical properties such as photoconductivity [1] and nonlinear optical property [2], having potential applications [3]. These polymers have silicon backbones with organic substituents as side chains.…”

Section: Introductionmentioning

confidence: 99%

Free-volume Characterization of Polysilanes Using Positron Annihilation Spectroscopy.

Tashiro

Seki

Pujari

et al. 1999

J. Photopol. Sci. Technol.

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“…This value is higher by the order of 10 3 than that for other side-chain aromatic vinyl polymers including poly(NVCz) and poly(1-vinylpyrene) (10 À7 cm 2 V À1 s À1 order), 78 and is the highest so far reported for a vinyl polymer, although mobility values higher than 10 À2 cm 2 V À1 s À1 have been reported for some other types of organic polymers. [79][80][81] The hole drift mobility of poly(DBF) is even higher than that of main-chain conjugating poly(p-phenylenevinylene) (1Â10 À5 cm 2 V À1 s À1 ), 82 is comparable to that of poly(methylphenylsilane) (1Â10 À4 cm 2 V À1 s À1 ), 83 and is slightly lower than Se (10 À4 cm 2 V À1 s À1 order), 73 an inorganic semiconductor.…”

Section: Charge Transport and Charge Delocalization Properties Of P-smentioning

confidence: 99%

Synthesis, structure and function of π-stacked polymers

Nakano

2010

Polym J

128

101

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Macromolecular conformation often has a significant effect on the properties of polymeric materials, and hence, conformational control in synthesizing a polymer is an important goal in polymer science. As a new conformational motif of vinyl polymers having side-chain p-electronic groups, we have introduced a 'p-stacked structure' in which side-chain chromophores are regularly stacked on top of each other and main-chain C-C bonds have a nearly all-trans, zigzag conformation. p-Stacked polymers can be prepared by vinyl polymerization of dibenzofulvene (DBF) and its derivatives. On the basis of the controlled structure, poly(DBF) and its derivatives exhibit unique photophysical and electronic properties as vinyl polymers. In addition, introduction of chirality to p-stacked polymers was also achieved. In this review, the synthesis of poly(DBF) and its derivatives and their structural analyses and properties are described. Polymer Journal (2010) 42, 103-123; doi:10.1038/pj.2009 Keywords: charge transport; chirality; dibenzofulvene; helix; photophysical properties; p-stacked structureIn designing functional organic materials with desired properties, spatial arrangement control of constituent molecules is an important factor because molecules in a regulated assembly often indicate properties different from those in solution or in gas phase because of specific intermolecular interactions. Effective molecular assembly control can be achieved by arrangement of functional molecules as a part of a polymer chain with a regulated conformation and configuration in which the polymer backbone functions as a structural template or scaffold. This is possible either by polymerizing functional molecules as monomers or by attaching functional molecules through a chemical reaction to a polymer chain. In the former case, the functional molecules to be aligned need to have a polymerizable moiety such as a vinyl group; they are a part of monomers and become constituents of a polymer chain as a part of monomeric units, typically as side-chain groups. The monomer structure itself may significantly contribute to the formation of a regulated polymer chain structure through intermolecular repulsion or attraction. An advantage of these polymer-based methods over other methodologies developed mainly for low-molecular-weight compounds based on the accumulation of relatively weak forces is that molecular orders formed along a polymer chain are generally stable due to covalent bonds. Moreover, using a polymer chain, a very tight or close packing of molecules (monomeric units), which is not plausible for the method based on weak intermolecular attractions, is possible when the enthalpy gain in covalent bond formation by polymerization or by polymer reaction outweighs the loss in free energy in packing molecules tightly into a small space around the polymer chain.Although these polymer-based methods generally require more synthetic efforts than intermolecular-force-based methods, a wider variety of molecular orders may be possible on the basis of re...

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“…Polysilanes (Scheme 1) [1] have attracted considerable attention due to their usefulness as the precursors for thermally stable ceramics [2,3] or a material for microlithography [4,5], and also due to their potentiality in the preparation of new types of material showing semiconducting, photoconducting, or nonlinear optical property [6][7][8]. In contrast to the growing interest with the polysilane, the method of preparation hitherto known is highly limited.…”

Section: Introductionmentioning

confidence: 99%

Electroreductive Synthesis of Polysilanes with Ordered Sequences

Ishifune¹

2012

New Polymers for Special Applications

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Photocarrier generation and transport inσ-bonded polysilanes

Cited by 395 publications

References 10 publications

Free-volume Characterization of Polysilanes Using Positron Annihilation Spectroscopy.

Free-volume Characterization of Polysilanes Using Positron Annihilation Spectroscopy.

Synthesis, structure and function of π-stacked polymers

Electroreductive Synthesis of Polysilanes with Ordered Sequences

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