4.5 Article

Giant organic single-crystals of a thiophene/phenylene co-oligomer toward device applications

Journal

SYNTHETIC METALS
Volume 161, Issue 17-18, Pages 1869-1877

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2011.06.026

Keywords

Giant organic single-crystal; Crystal growth; Thiophene/phenylene co-oligomer; Organic FET; Spectrally narrowed emission; Device application

Funding

  1. Ministry of Education, Culture, Sports, Science and Technology, Japan [17067009, 20655041]
  2. Grants-in-Aid for Scientific Research [23550208, 20655041, 22350082] Funding Source: KAKEN

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We present the preparation of giant organic thin single-crystals of 2,5-bis(4-biphenylyl)thiophene (BP1T), a thiophene/pbenylene co-oligomer (TPCO). Large-size well-defined hexagon crystals of BP1T were obtained by recrystallization from 1,2,4-trichlorobenzene solution using the constant-volume decreasing-temperature method under various conditions. The largest crystal had a size of 7.6 x 4.4 mm. We describe the detailed growth procedure and characterization of the resulting crystals. The polarizing microscope observation of the crystals confirms that they are present as single-crystals. In virtue of the large size of the crystal we were able to fabricate three field-effect transistor (FET) devices on one single crystal. The devices showed normal p-type FET characteristics. Furthermore, the emission features are examined. Major emission peaks were spectrally narrowed with increasing excitation energies. Several crystals exhibited the narrowed emission lines accompanied by many concentric fringes of various sizes. These observations strongly indicate that the emission is a coherent radiation. (C) 2011 Elsevier B.V. All rights reserved.

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