Changes of the Molecular Structure in Organic Thin Film Transistors during Operation

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• 作者：Fabiola Liscio ; Laura Ferlauto ; Micaela Matta ; Raphael Pfattner ; Mauro Murgia ; Concepci贸 Rovira ; Marta Mas-Torrent ; Francesco Zerbetto ; Silvia Milita ; Fabio Biscarini
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：July 16, 2015
• 年：2015
• 卷：119
• 期：28
• 页码：15912-15918
• 全文大小：336K
• ISSN：1932-7455

文摘

Thin films of organic semiconductors have been widely studied at different length scales for improving the electrical response of devices based on them. Hitherto, a lot of knowledge has been gained about how molecular packing, morphology, grain boundaries, and defects affect the charge transport in organic thin film transistors. However, little is known about the impact of an electric field on the organic semiconductor microstructure and the consequent effect on the device performances. To fill this gap, we investigated the evolution of the structure of pentacene thin film transistors during device operation by in situ real time X-ray diffraction measurements and theoretical calculations. We observed for the first time the occurrence of a reversible structural strain taking place during the bias application mainly due to reorientation at the terrace edges of monolayer islands under the effect of electrical field. Strain exhibits the same trend of the threshold voltage hinting to the existence of a direct correlation between the phenomenon of bias stress and the structural modification.