Effects of Interfacial Charge Depletion in Organic Thin-Film Transistors with Polymeric Dielectrics on Electrical StabilityReportar como inadecuado


Effects of Interfacial Charge Depletion in Organic Thin-Film Transistors with Polymeric Dielectrics on Electrical Stability


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1

School of Electrical Engineering, Seoul National University, Seoul 151-600, Korea

2

School of Electronic and Electrical Engineering, Hongik University, Seoul 121-791, Korea





*

Author to whom correspondence should be addressed.



Abstract We investigated the electrical stabilities of two types of pentacene-based organic thin-film transistors OTFTs with two different polymeric dielectrics: polystyrene PS and poly4-vinyl phenol PVP, in terms of the interfacial charge depletion. Under a short-term bias stress condition, the OTFT with the PVP layer showed a substantial increase in the drain current and a positive shift of the threshold voltage, while the PS layer case exhibited no change. Furthermore, a significant increase in the off-state current was observed in the OTFT with the PVP layer which has a hydroxyl group. In the presence of the interfacial hydroxyl group in PVP, the holes are not fully depleted during repetitive operation of the OTFT with the PVP layer and a large positive gate voltage in the off-state regime is needed to effectively refresh the electrical characteristics. It is suggested that the depletion-limited holes at the interface, i.e., interfacial charge depletion, between the PVP layer and the pentacene layer play a critical role on the electrical stability during operation of the OTFT. View Full-Text

Keywords: organic thin-film transistors; stability; polymer; dielectrics; hydroxyl group organic thin-film transistors; stability; polymer; dielectrics; hydroxyl group





Autor: Jaehoon Park 1, Jin-Hyuk Bae 1, Won-Ho Kim 1, Min-Hoi Kim 1, Chang-Min Keum 1, Sin-Doo Lee 1,* and Jong Sun Choi 2

Fuente: http://mdpi.com/



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