Abstract
As a modification to the insoluble and herringbone-structured pentacene, bis(triisopropylsilylethynyl) (TIPS) pentacene has two bulky side groups, leading to good solubility in common organic solvents and regular π-π stacking arrangements in the crystalline state. Solution processing of TIPS-pentacene thin films was investigated as a function of various process parameters in this work. Electron diffraction results suggested that TIPS-pentacene molecules tended to align with the acene unit edge on to the substrate, touching down with their bulky side groups. In a TIPS-pentacene polycrystalline film, the long axis of individual crystallite is [2 1 0], while the shorter axis is [1 2̄ 0]. High-resolution electron microscopy was used to study the local crystal structure and characteristic defects of TIPS-pentacene thin films. Due to the nonaromatic side groups, TIPS-pentacene was found to be significantly more sensitive to the electron beam (critical dose Jc = 0.05 C/cm2 at 300 kV) than pentacene itself (Jc = 0.2 C/cm2 at 100 kV).
Original language | English |
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Pages (from-to) | 1701-1709 |
Number of pages | 9 |
Journal | Journal of Materials Research |
Volume | 22 |
Issue number | 6 |
DOIs | |
State | Published - Jun 2007 |
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering