Journal
JOURNAL OF MATERIALS RESEARCH
Volume 22, Issue 6, Pages 1701-1709Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/JMR.2007.0220
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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 pi-pi 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 2 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 J(c) = 0.05 C/cm(2) at 300 kV) than pentacene itself (J(c) = 0.2 C/cm(2) at 100 kV).
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