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Thin Film Transistors with Ink-Jet Printed Amorphous Oxide Semiconductors

2010; Institute of Physics; Volume: 49; Issue: 5S1 Linguagem: Inglês

10.1143/jjap.49.05eb06

1347-4065

Dongjo Kim, Youngmin Jeong, Chang Young Koo, Keunkyu Song, Jooho Moon,

ZnO doping and properties

We investigated the influence of the thickness of printed Ga–In–Zn-O (GIZO) channel on transistor performance. Semiconductor layers were ink-jet printed using sol–gel derived GIZO solution and the thickness of the resulting active layers varied depending on the pre-heated substrate temperature. We found that GIZO film thickness significantly influences device performance. Thin film transistors (TFTs) with thicker active layers showed higher on-current/off-current mobility and a threshold voltage shift in the negative direction. The dependence of the electric characteristics on thickness resulted from the increased intrinsic free charge carriers as the active layer thickness increased. Ink-jet printing conditions need to be carefully controlled to maximize device performance.