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http://dx.doi.org/10.4313/JKEM.2017.30.3.180

Annealing Effects on Ambipolar Characteristics of Diketopyrrolopyrrole-Based Polymer Thin-Film Transistors  

Yoon, Gyu Bok (Department of Graphic Arts Information Engineering, Pukyong National University)
Lee, Jiyoul (Department of Graphic Arts Information Engineering, Pukyong National University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.30, no.3, 2017 , pp. 180-184 More about this Journal
Abstract
In this study, we examine the electrical properties of diketopyrrolopyrrole (DPP) containing polymer semiconductors that have been reported to show high performance with ambipolar characteristics. We prepared three different DPP based polymer semiconductors (PDPPTPT, PDPP3T, and PDPP2T-TT) and fabricated organic thin film transistors (OTFTs) with ambipolar polymer semiconductors as an active layer. All three DPP polymers showed only p-type properties at initial measurements. However, after annealing in vacuum oven for 24 hours, it was found that the DPP based polymers have both p-type and n-type properties. It is speculated that the residual impurities supposedly regarded as a strong electron trap source were eliminated during the vacuum process.
Keywords
Annealing effect; Polymer semiconductor; Thin-film transistors; Ambipolar behavior;
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