Journal ArticleDOI
Polymorphism in pentacene
TLDR
Pentacene, C(22)H(14), crystallizes in different morphologies characterized by their d(001)-spacings of 14.1 and 14.5 A d-spacing morphologies grown by vapour transport and from solution.Abstract:
Pentacene, C22H14, crystallizes in different morphologies characterized by their d(001)-spacings of 14.1, 14.5, 15.0 and 15.4 A. We have studied the crystal structure of the 14.1 and 14.5 A d-spacing morphologies grown by vapour transport and from solution. We find a close correspondence between the 14.1 A structure reported by Holmes, Kumaraswamy, Matzeger & Vollhardt [Chem. Eur. J. (1999), 5, 3399–3412] and the 14.5 A structure reported by Campbell, Monteath Robertson & Trotter [Acta Cryst. (1961), 14, 705–711]. Single crystals commonly adopt the 14.1 A d-spacing morphology with an inversion centre on both molecules in the unit cell. Thin films grown on SiO2 substrates above 350 K preferentially adopt the 14.5 A d-spacing morphology, with a slightly smaller unit-cell volume.read more
Citations
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The larger acenes: versatile organic semiconductors.
TL;DR: New approaches to add functionality were developed to improve the processability of these materials in solution, allowing the synthesis of acenes larger than pentacene, which have hitherto been largely unavailable and poorly studied.
Journal ArticleDOI
Tetrathiafulvalenes, oligoacenenes, and their buckminsterfullerene derivatives: the brick and mortar of organic electronics.
Journal ArticleDOI
Integrated materials design of organic semiconductors for field-effect transistors
TL;DR: Some of the major milestones along the way are highlighted to provide a historical view of OFET development, introduce the integrated molecular design concepts and process engineering approaches that lead to the current success, and identify the challenges ahead to make OFETs applicable in real applications.
Journal ArticleDOI
Effect of electronic polarization on charge-transport parameters in molecular organic semiconductors.
Edward F. Valeev,Veaceslav Coropceanu,Demetrio A. da Silva Filho,Seyhan Salman,Jean-Luc Brédas +4 more
TL;DR: It is shown that the neglect of electronic polarization leads to qualitatively incorrect values and trends for the transfer integrals computed with the energy splitting method, even in simple prototypes such as ethylene or pentacene dimers.
Journal ArticleDOI
25th anniversary article: key points for high-mobility organic field-effect transistors.
TL;DR: In this review, the key points for development of high mobility OFETs are highlighted from aspects of molecular engineering, process engineering and interface engineering, and the importance of other factors, such as impurities and testing conditions is also addressed.
References
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ORTEP-3 for Windows - a version of ORTEP-III with a Graphical User Interface (GUI)
TL;DR: L Lists of software presented and~or reviewed in the Journal of Applied Crystallography are available on the World Wide Web at the above address, together with information about the availability of the software where this is known.
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SIR97: a new tool for crystal structure determination and refinement
Angela Altomare,Maria Cristina Burla,Mercedes Camalli,Giovanni Luca Cascarano,Carmelo Giacovazzo,Antonietta Guagliardi,Anna Moliterni,Giampiero Polidori,Riccardo Spagna +8 more
TL;DR: SIR97 is the integration of two programs, SIR92 and CAOS, the first devoted to the solution of crystal structures by direct methods, the second to refinement via least-squares–Fourier procedures.
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Physical vapor growth of organic semiconductors
TL;DR: Physical vapor growth in horizontal and vertical systems has been used to grow crystals of α-hexathiophene (α-6T), α-octithiophene, α-4T, pentacene, anthracene and copper phthalocyanine.
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The crystal structure of hexacene, and a revision of the crystallographic data for tetracene
TL;DR: Crys et al. as discussed by the authors have shown that, in spite of the decrease in crystallographic symmetry, the arrangements of molecules closely resemble that in the monoelinie naphthalene and anthracene crystals.
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Ambipolar pentacene field-effect transistors and inverters.
TL;DR: Organic field-effect transistors based on pentacene single crystals, prepared with an amorphous aluminum oxide gate insulator, are capable of ambipolar operation and can be used for the preparation of complementary inverter circuits.