The Relationship between Threshold Voltage and Dipolar Character of Self-Assembled Monolayers in Organic Thin-Film Transistors

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• 作者：Michael Salinas ; Christof M. J盲ger ; Atefeh Y. Amin ; Pavlo O. Dral ; Timo Meyer-Friedrichsen ; Andreas Hirsch ; Timothy Clark ; Marcus Halik
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：August 1, 2012
• 年：2012
• 卷：134
• 期：30
• 页码：12648-12652
• 全文大小：366K
• 年卷期：v.134,no.30(August 1, 2012)
• ISSN：1520-5126

文摘

We report a quantitative study that describes and correlates the threshold voltage of low-voltage organic field-effect transistors with the molecular structure of self-assembled monolayer dielectrics. We have observed that the component of the dipole moment of such self-assembled molecules perpendicular to the surface correlates linearly with the threshold voltage shift in devices. The model was validated using three different organic semiconductors (pentacene, 伪,伪鈥?dihexylsexithiophene, and fullerene鈥揅₆₀) on six different self-assembled monolayers. The correlation found can help optimize future devices, by tuning the dipole moments of the molecules that constitute the self-assembled monolayer.