Date

Place

Room H (Room Hall 1, 1F)
P1. Poster Session I
August 20, 2015 (Thursday)
14:00 ~ 15:30

[P1-41]
14:00 ~ 15:30
Title:Role of Organometallic Interface on Dynamic Photoresponse of Organic Field-Effect-Transistor Under Illumination
Hea-Lim Park, Chang-Min Keum (Seoul Nat'l Univ., Korea), Min-Hoi Kim (Hanbat Nat'l Univ., Korea), and Sin-Doo Lee (Seoul Nat'l Univ., Korea)
Abstract: Organic field-effect-transistors (OFETs) have attracted enormous attention due to low cost, light weight, flexibility, and large area applications. In this study, we demonstrate how the organometallic interfaces affect the dynamic photoresponse of the OFET under light illumination. Three pentacene-based OFETs with three different source (S) and drain (D) electrodes of gold (Au), silver (Ag), and aluminum (Al), respectively, were fabricated using the same gate insulator of poly(4-vinylphenol) (PVP). It was found that upon the periodic illumination of light, for the Au case, the photo-generated current barely decayed and accumulated whereas for the Al case, it exhibited well-defined recovery processes. This phenomenon is mainly attributed to the interplay between the hydroxyl group at the organic semiconductor (OSC)/dielectric interface and the energy barrier at the OSC/SD in the OFET.??Our photo-dynamic approach to the characterization of the organometallic interface in the OFET will provide a useful guideline not only to deeply understand the charge transport-associated phenomena at the interfaces but also to select suitable SD electrodes for the optical applications of the OFET.
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