Azeotropic binary solvent mixtures for preparation of organic single crystals

Xiaoran Li, B. K.C. Kjellander, John E. Anthony, Cornelis W.M. Bastiaansen, Dirk J. Broer, Gerwin H. Gelinck

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Here, a new approach is introduced to prepare large single crystals of π-conjugated organic molecules from solution. Utilizing the concept of azeotropism, single crystals of tri-isopropylsilylethynyl pentacene (TIPS-PEN) with dimensions up to millimeters are facilely self-assembled from homogeneous solutions comprising two solvents with opposing polarities and a positive azeotropic point At solvent compositions close to the azeotropic point, an abrupt transition of morphology from polycrystalline thin-films to large single crystals is found. How to adjust the initial ratio of the binary solvents so that the change in solvent composition during evaporation favors the specific H-aggregation and promotes an efficient self-assembly of TIPS-PEN is explained. The charge-carrier (hole) mobilities are substantially enhanced by a factor of 4 from the morphology of thin-films to large single crystals used as active layer in field-effect transistors. Additionally this approach is extended to other π-π stacked organic molecules to elucidate its broad applicability.

Original languageEnglish
Pages (from-to)3610-3617
Number of pages8
JournalAdvanced Functional Materials
Volume19
Issue number22
DOIs
StatePublished - Nov 23 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Condensed Matter Physics
  • General Materials Science
  • Electrochemistry
  • Biomaterials

Fingerprint

Dive into the research topics of 'Azeotropic binary solvent mixtures for preparation of organic single crystals'. Together they form a unique fingerprint.

Cite this