Physics – Condensed Matter – Materials Science
Scientific paper
2010-06-25
Appl. Phys. Lett. 97, 022108 (2010)
Physics
Condensed Matter
Materials Science
4 pages, 3 figures
Scientific paper
10.1063/1.3464964
We find that O-vacancy (Vo) acts as a hole trap and play a role in negative bias illumination stress instability in amorphous In-Ga-Zn-O thin film transistors. Photo-excited holes drifted toward the channel/dielectric interface due to small potential barriers and can be captured by Vo in the dielectrics. While Vo(+2) defects are very stable at room temperature, their original deep states are recovered via electron capture upon annealing. We also find that Vo(+2) can diffuse in amorphous phase, including hole accumulation near the interface under negative gate bias.
Chang Kee Joo
Choi Eun-Ae
Noh Hyeon-Kyun
Ryu Byungki
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