Structure and thermochromic solid-state phase transition of poly(3-alkylthiophene): [3] effects of alkyl side chain length on the phase transitional behavior

Tashiro, Kohji; Minagawa, Yasuhisa; Kobayashi, Masamichi; Morita, Shigenori; Kawai, Tsuyoshi; Yoshino, Katsumi

doi:10.1016/0379-6779(93)90952-s

Cited by 53 publications

(26 citation statements)

References 9 publications

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“…According to Tashiro et al, 32 In fact, P3DDT has a larger intermolecular interaction than P3HT and P3OT in the film as evidenced by the intensity of the shoulder peak at 610 nm in the UV-vis spectra.…”

Section: Influence Of the Solubility On The Molecular Orientationmentioning

confidence: 90%

“…The correlation between the primary molecular structure and the final molecular orientation in a thin film is, however, still ambiguous and experiences are needed. For instance, the molecular orientation as a function of the alkyl sidechain length is not systematically revealed, although the length is known to significantly influence the thermal behavior 28 and the device performance [29][30][31] via the conjugate length 32 etc. The molecular mechanism, in addition, to explain the reason the "hexyl" chain yields a best result for both OPV and OFET devices is also still unclear.…”

Section: Introductionmentioning

confidence: 99%

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A new schematic for poly(3-alkylthiophene) in an amorphous film studied using a novel structural index in infrared spectroscopy

Shioya

Shimoaka

Eda

et al. 2015

Phys. Chem. Chem. Phys.

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The molecular structure of poly(3-alkylthiophene-2,5-diyl) in an amorphous film reveals that the short axis of the thiophene ring is kept highly oriented parallel to the substrate, whereas the long axis along the polymer chain is largely disordered. This is unveiled by infrared p-polarized multiple-angle incidence resolution spectroscopy (pMAIRS), achieved by analyzing the orientation angles of three mutually orthogonal vibrational modes localized on the thiophene ring with the aid of a newly developed structural index. This new analytical technique is useful irrespective of the crystallinity of the thin film. As a result, the intrinsic chemical parameters controlling the molecular orientation are understood in a unified manner, and the reason that the hexyl group gives the best results for a photovoltaic cell is also revealed.

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Section: Influence Of the Solubility On The Molecular Orientationmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

A new schematic for poly(3-alkylthiophene) in an amorphous film studied using a novel structural index in infrared spectroscopy

Shioya

Shimoaka

Eda

et al. 2015

Phys. Chem. Chem. Phys.

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“…The existence of the polymorphic modifications indicates that the energetic stabilities of the two packing structures are very similar. Since the polythiophene backbones and alkyl chains adopt fully planar and all-trans conformations, respectively, at room temperature [ 25 , 26 ], the stability of a packing structure is determined by nonbonded attractions between polymer backbones and between alkyl chains [ 27 – 29 ]. The ones between a backbone and an alkyl chain are minor so that they are usually ignored [ 28 , 29 ].…”

Section: Resultsmentioning

confidence: 99%

Photoluminescence Properties of Polymorphic Modifications of Low Molecular Weight Poly(3-hexylthiophene)

et al. 2017

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The structural and photoluminescence (PL) properties of thin films of poly(3-hexylthophene) (P3HT) with molecular weights (MWs) of 3000 and 13,300 have been investigated. Although high MW P3HT always self-organizes into one packing structure (form I), low MW P3HT forms two different packing structures (forms I and II) depending on the fabrication conditions. In this work, several fabrication techniques have been examined to obtain form II samples with little inclusion of a form I component. It is found that drop-cast thin films of low MW P3HT (form II) exhibit a PL spectrum that is different from that of form I and does not contain the form I component. The PL spectrum can thus be attributed to form II. The differences in PL properties between forms I and II can be understood in terms of weakened interchain interactions due to the longer interchain distance in form II.

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“…In this respect, the alkyl side-chain in polyalkylthiophene may play a major role in determining the structure, and therefore the properties of the polymers. In the literature, there are many articles which showed the effects of these alkyl chains, such as variable temperature conductivity, 18 optical, 19,20 mechanical, 21 and magnetic properties, 22 oxidation potential 23 and phase transition. 24 However, those articles discussed only how the side-chain affects those specific properties; there does not yet exist a conclusion which integrates all the data reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Steric effect and mobility of the alkyl chain in regio-irregular poly-3-alkylthiophenes

Lin

Chan

et al. 1999

J. Polym. Sci. B Polym. Phys.

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Structure and thermochromic solid-state phase transition of poly(3-alkylthiophene): [3] effects of alkyl side chain length on the phase transitional behavior

Cited by 53 publications

References 9 publications

A new schematic for poly(3-alkylthiophene) in an amorphous film studied using a novel structural index in infrared spectroscopy

A new schematic for poly(3-alkylthiophene) in an amorphous film studied using a novel structural index in infrared spectroscopy

Photoluminescence Properties of Polymorphic Modifications of Low Molecular Weight Poly(3-hexylthiophene)

Steric effect and mobility of the alkyl chain in regio-irregular poly-3-alkylthiophenes

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