Abstract
The application of dinaphthothienothiophene (DNTT) molecules, a novel organic semiconductor material, has recently increased due to its high charge carrier mobility and thermal stability. Since the structural properties of DNTT molecules, such as the molecular density distribution and molecular orientations, significantly affect their charge carrier mobility in organic field-effect transistors devices, investigating these properties would be important. Here, we report Raman spectroscopic studies on DNTT in a transistor device, which was further analyzed by the density functional theory. We also show a perspective of this technique for orientation analysis of DNTT molecules within a transistor device.
Highlights
Organic field-effect transistors (OFETs) are important electronic devices that are often used in digital screens [1], electronic papers [2], plastic circuits [3], and sensors [4] because of their unique properties, such as flexibility, light weight, ease of large area fabrication, and low-cost production
We demonstrated that it was possible to analyze the molecular orientation of pentacene, a molecule similar to DNTT, where the tilt angle of the pentacene on the substrate was investigated by using polarization-dependent Raman analysis [28,29]
We report Raman spectroscopic studies of DNTT molecules on an actual transistor device to comprehensively understand the fundamental properties of molecular vibrations of DNTT
Summary
Organic field-effect transistors (OFETs) are important electronic devices that are often used in digital screens [1], electronic papers [2], plastic circuits [3], and sensors [4] because of their unique properties, such as flexibility, light weight, ease of large area fabrication, and low-cost production. In terms of better performance due to their high charge carrier mobilities, pentacene molecules and their derivatives in acene series have been widely used in organic electronics [7,8]. A number of publications on the application of DNTT molecules have appeared [12,13,14,15,16] These investigations on DNTT were primarily focused on the practical realizations of the OFET devices and demonstration of their potential applications. The possible effects of the fundamental structural properties of DNTT—such as the molecular density distribution and molecular orientations—on the device performance have not been investigated extensively. For the best possible charge carrier mobility, the DNTT molecules should be densely packed and aligned on the substrate in such a way that the aromatic rings
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