Electrical Conduction of Regioregular and Regiorandom Poly(3-hexylthiophene) Doped with Iodine

Ukai, Sota; Ito, Hiroshi; Marumoto, Kazuhiro; Kuroda, Shin–ichi

doi:10.1143/jpsj.74.3314

Cited by 33 publications

(30 citation statements)

References 30 publications

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“…The VRH conduction mechanism occurs with the help of the overlap of carrier wavefunctions at high carrier densities; therefore, observation of VRH processes is a signature of a delocalized electronic state. The 2D VRH process in the highly conductive samples contrasts with the case for P3HT, where a 1D VRH process was observed in the iodine‐doped or electrochemically doped thin films . This could originate from larger interchain interaction in PBTTT molecules due to a shorter π−π stacking distance than that in P3HT .…”

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confidence: 73%

Microscopic Signature of Metallic State in Semicrystalline Conjugated Polymers Doped with Fluoroalkylsilane Molecules

et al. 2013

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Fluoroalkylsilane (FTS) acts as an efficient p-type dopant for organic semiconductors. FTS-doped films of the semicrystalline PBTTT polymer exhibit relatively high conductivities. We demonstrate that highly doped PBTTT films exhibit a metallic nature with clear Pauli paramagnetism as observed microscopically using electron spin resonance spectroscopy. The metallic state is realized within crystalline grains, as confirmed from the anisotropy of the ESR signal.

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confidence: 73%

Microscopic Signature of Metallic State in Semicrystalline Conjugated Polymers Doped with Fluoroalkylsilane Molecules

et al. 2013

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“…2 Furthermore, by using iodine as dopant the conduction in rr-P3HT films could be enhanced, and within specific doping regimes the dependence of the conductivity on temperature has been investigated. 3 However, for organic semiconducting devices molecular doping is preferable, since field-induced drift of the relative large-size charged molecular dopants can be suppressed. Recently, rr-P3HT based OFETs doped with the strong acceptor 3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane ͑F4-TCNQ͒ have been reported.…”

Section: Enhancement Of the Hole Injection Into Regioregular Poly"3-hmentioning

confidence: 99%

Enhancement of the hole injection into regioregular poly(3-hexylthiophene) by molecular doping

Zhang

Blom

2010

Applied Physics Letters

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The hole injection in Schottky barriers formed between p-type doped regioregular poly(3-hexylthiophene-2,5-diyl) (rr-P3HT) and silver (Ag) is investigated. The rr-P3HT is controllably doped using the acceptor 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ). We demonstrate that only one order of magnitude increase in the background hole density p0, from 2×1016 to 2×1017 cm−3, enhances the hole injection with two orders of magnitude. The hole injection barrier is lowered by 0.5 eV and exhibits a linear dependence on p0, which can be explained by doping induced surface charges.

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“…[14] Regio-regular means that alkyl side-chains on adjacent PT backbones are ordered in a "head to tail" conformation. [15,16] Semi-crystalline polymers exhibit highly ordered crystalline regions with disordered amorphous regions. [17] In the family of P3ATs, two polymorphs, called Form I and II, have been observed, which differ mainly by the sidechain conformations.…”

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Linear optical properties and electronic structures of poly(3-hexylthiophene) and poly(3-hexylselenophene) crystals from first principles

2012

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Linear optical properties of regio-regular-poly(3-hexythiophene) (rr-P3HT) and regio-regularpoly(3-hexyselenophene) (rr-P3HS) are investigated in relation to their anisotropic crystal structure by means of first-principles density functional calculations. The optical spectra are evaluated by calculating its dielectric functions, focusing on the frequency dependence of the imaginary part. The optical transition along the π-conjugation connecting backbone direction is found to be the most significant at the band edges. A group-theoretical analysis of the matrix elements is given to explain the interband transitions. The optical spectra, electronic structures and structural stabilities are calculated using the all-electron full-potential linearized augmented plane wave (FLAPW) method within the local-density approximation. We proposed several possible crystal structures of rr-P3HT, and performed structural optimizations to determine a stable structure. Comparing the total energy differences among these relaxed structures, a base-centered monoclinic structure belonging to the space group A2 is found to be the most stable structure. In the electronic structure, C and S orbitals belonging to polythiophene backbones are the biggest contributors at the valence band maximum and conduction band minimum, but there is almost no contribution from the hexyl sidechains. Lastly, the differences in electronic and optical properties between rr-P3HT and rr-P3HS are discussed. * Electronic address: tsumu@riken.jp; Present address: RIKEN, Wako, Saitama 351-0198, Japan † Jung-Hwan Song is deceased 1

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Electrical Conduction of Regioregular and Regiorandom Poly(3-hexylthiophene) Doped with Iodine

Cited by 33 publications

References 30 publications

Microscopic Signature of Metallic State in Semicrystalline Conjugated Polymers Doped with Fluoroalkylsilane Molecules

Microscopic Signature of Metallic State in Semicrystalline Conjugated Polymers Doped with Fluoroalkylsilane Molecules

Enhancement of the hole injection into regioregular poly(3-hexylthiophene) by molecular doping

Linear optical properties and electronic structures of poly(3-hexylthiophene) and poly(3-hexylselenophene) crystals from first principles

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