Orientation Control of Solution-Processed Organic Semiconductor Crystals to Improve Out-of-Plane Charge Mobility

Xiaoshen Bai, Kai Zong, Jack Ly, Jeremy S. Mehta, Megan Hand, Kaitlyn Molnar, Sangchul Lee, Bart Kahr, Jeffrey M. Mativetsky, Alejandro Briseno, Stephanie S. Lee

Research output: Contribution to journalArticle

Abstract

The crystallization of a series of triisopropylsilylethynyl (TIPS)-derivatized acene-based organic semiconductors drop cast from solution onto substrates was investigated as a function of the size of their conjugated cores. When drop cast onto a substrate, the molecules in TIPS-pentacene crystals adopt a "horizontal" orientation, with the long axis of the pentacene core parallel to the substrate surface. For crystals comprising molecules with dibenzopyrene, anthanthrene, and pyranthrene cores, two-dimensional X-ray diffraction patterns revealed the existence of a second population of crystals adopting a "vertical" molecular orientation with the long axis of the acene core perpendicular to the substrate surface. The ratio of the population of TIPS-pyranthrene crystals with molecules adopting horizontal versus vertical orientations was controlled by varying the surface energy of the underlying substrate. These crystals displayed orientation-dependent linear birefringence and linear dichroism, as observed by differential polarizing optical microscopy. Conductive atomic force microscopy (C-AFM) revealed a 42-fold improvement in out-of-plane hole mobility through crystals adopting the vertical molecular orientation compared to those adopting the horizontal molecular orientation.

Original languageEnglish (US)
Pages (from-to)7571-7578
Number of pages8
JournalChemistry of Materials
Volume29
Issue number17
DOIs
StatePublished - Sep 12 2017

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Semiconducting organic compounds
Crystal orientation
Molecular orientation
Crystals
Substrates
Molecules
Hole mobility
Dichroism
Crystallization
Birefringence
Interfacial energy
Diffraction patterns
Optical microscopy
Atomic force microscopy
X ray diffraction

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

Orientation Control of Solution-Processed Organic Semiconductor Crystals to Improve Out-of-Plane Charge Mobility. / Bai, Xiaoshen; Zong, Kai; Ly, Jack; Mehta, Jeremy S.; Hand, Megan; Molnar, Kaitlyn; Lee, Sangchul; Kahr, Bart; Mativetsky, Jeffrey M.; Briseno, Alejandro; Lee, Stephanie S.

In: Chemistry of Materials, Vol. 29, No. 17, 12.09.2017, p. 7571-7578.

Research output: Contribution to journalArticle

Bai, X, Zong, K, Ly, J, Mehta, JS, Hand, M, Molnar, K, Lee, S, Kahr, B, Mativetsky, JM, Briseno, A & Lee, SS 2017, 'Orientation Control of Solution-Processed Organic Semiconductor Crystals to Improve Out-of-Plane Charge Mobility', Chemistry of Materials, vol. 29, no. 17, pp. 7571-7578. https://doi.org/10.1021/acs.chemmater.7b02771
Bai, Xiaoshen ; Zong, Kai ; Ly, Jack ; Mehta, Jeremy S. ; Hand, Megan ; Molnar, Kaitlyn ; Lee, Sangchul ; Kahr, Bart ; Mativetsky, Jeffrey M. ; Briseno, Alejandro ; Lee, Stephanie S. / Orientation Control of Solution-Processed Organic Semiconductor Crystals to Improve Out-of-Plane Charge Mobility. In: Chemistry of Materials. 2017 ; Vol. 29, No. 17. pp. 7571-7578.
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