Interface resistivity and lifetime of thin film transistors exposed to ambient air

Petrovic, Andrazˇ; Bratina, Gvido
March 2009
Applied Physics Letters;3/23/2009, Vol. 94 Issue 12, p123301
Academic Journal
We found that different contributions to the resistivity in pentacene-based organic thin film transistors exhibit different time dependences upon extended exposure to ambient air. Our Kelvin force microscopy data show that contact resistance at the drain/source interface and the resistance of the pentacene channel initially decrease and after approximately 6 h monotonically increase. The contact resistance at the source/pentacene interface, on the other hand, initially decreases and exhibits only minor increase after 6 h. Such behavior is interpreted in terms of competing effect of oxygen and water penetration in the pentacene channel and in the interfacial region.


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