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Suppression of temperature instability in InGaZnO thin-film transistors by in situ nitrogen doping

2013; IOP Publishing; Volume: 28; Issue: 11 Linguagem: Inglês

10.1088/0268-1242/28/11/115010

1361-6641

Jayapal Raja, Kyungsoo Jang, Nagarajan Balaji, Junsin Yi,

Silicon and Solar Cell Technologies

We have investigated the effect of nitrogen doping on the behavior of hysteresis curve and its suppression of temperature instability in amorphous InGaZnO thin-film transistors (a-IGZO TFTs). The in situ nitrogen doping reduced the temperature induced abnormal sub threshold leakage current and traps generation. Large falling-rate (FR) ∼ 0.26 eV V−1, low activation energy (Ea) ∼ 0.617 eV and a small hysteresis compared to the pure a-IGZO TFTs, shows the best immunity to thermal instability. This is mainly attributed to the reduction of interface trap density and oxygen vacancies due to the passivation of defects and/dangling bonds.