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Organic semiconductors, conductors and superconductors
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TLDR
In this article, the ionization energy and carrier mobility measurements for the purpose of elucidating the conduction mechanism were performed for a series of single component organic semiconductors called molecular fasteners.Abstract:
The two major categories of organic solids are known to offer the present of good electrical conduction. The first group consists of charge-transfer complexes. Conductivity measurements on a large number of the charge-transfer complexes have been carried out. Among them, organic conductors (synthetic metals) and also organic superconductors have been discovered. The other group comprises single component materials; typical examples are polycyclic aromatic compounds and phthalocyanines. Their conductivities, generally speaking, are not as good as those of the charge transfer kind. We recently discovered a series of single component organic semiconductors having fairly good conductivity, which we called molecular fasteners. We also present, in this article, the experimental work on the ionization energy and carrier mobility measurements for the purpose of elucidating the conduction mechanism.read more
Citations
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Synthetic Principles for Bandgap Control in Linear pi-Conjugated Systems.
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Intermolecular energy-band dispersion in oriented thin films of bis(1,2,5-thiadiazolo)-p-quinobis(1,3-dithiole) by angle-resolved photoemission
Shinji Hasegawa,Takehiko Mori,K. Imaeda,Shoji Tanaka,Yoshiro Yamashita,Hiroo Inokuchi,Hitoshi Fujimoto,K. Seki,Nobuo Ueno +8 more
TL;DR: In this paper, the authors measured the intermolecular dispersion of bis(1,2,5thiadiazolo) and quinobis (1,3dithiole) on graphite.
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Structures and Energetics Study of Tetrathiafulvalene-Based Donors of Organic Superconductors
TL;DR: In this article, the authors present ab initio quantum mechanical calculations (HF, MP2, and DFT using the 6-31G** basis) for the optimized structures and other properties of TTF-based organic donors X and X+.
Journal ArticleDOI
Optical Second Harmonic Generation in Achiral Bis(n-alkylamino)dicyanoquinodimethanes: Alkyl Chain Length as the Design Element
Palash Gangopadhyay,S P Sharma,A. Jaganmohan Rao,D. Narayana Rao,Shmuel Cohen,Israel Agranat,T. P. Radhakrishnan +6 more
TL;DR: In this article, the chain length of substituted n-alkyl groups is proposed as a convenient design element for the generation of non-centrosymmetric crystal lattices of interest in optical second harmonic generation (SHG).
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Influence of alkyl chain length on the crystal structures and optical SHG of N-n-alkyl-2,4-dinitroanilines: Role of dipolar and dispersion energies
TL;DR: In this article, a series of N-nalkyl-2,4-dinitroanilines is investigated along with crystal structure analysis of the propyl, butyl, and pentyl derivatives.
References
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Journal ArticleDOI
Studies of polaron motion: Part I. The molecular-crystal model
TL;DR: In this paper, a model for polaron motion is described, in simplified form, incorporating the principal physical features of the problem, and the conditions under which the size of the polaron becomes comparable to a lattice spacing (small) are discussed.
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Studies of polaron motion: Part II. The “small” polaron
TL;DR: In this article, the authors considered the case in which the electronic-overlap term of the total Hamiltonian is a small perturbation, and showed that the probability of off-diagonal transitions goes up exponentially with increasing temperature.
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Electron transfer in a new highly conducting donor-acceptor complex
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Superconducting fluctuations and the Peierls instability in an organic solid
L. B. Coleman,Marshall J. Cohen,D.J. Sandman,F.G. Yamagishi,Anthony F. Garito,Alan J. Heeger +5 more
TL;DR: In this article, the discovery of extraordinary conductivity maxima in a class of organic charge transfer salts is interpreted as resulting from superconducting fluctuations at high temperatures, and a possible mechanism for achieving high temperature superconductivity is suggested based on the electron-phonon interaction, in the strong coupling limit, and the Peierls soft-mode instability in pseudo-one-dimensional systems.
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Charge Carrier Production and Mobility in Anthracene Crystals
TL;DR: The drift mobilities of electrons and holes in anthracene crystals have been measured using a pulsed photoconductivity technique as mentioned in this paper, and the results indicate that the charge carriers are not produced in the interior of the crystal, but that they are released from a surface layer of a crystal either directly by photons or by excitons which migrate to the surface.