Improved Stability of Atomic Layer Deposited ZnO Thin Film Transistor by Intercycle Oxidation

Himchan Oh
2012 ETRI Journal  
By inserting H 2 O treatment steps during atomic layer deposition of a ZnO layer, the turn-on voltage shift from negative bias stress (NBS) under illumination was reduced considerably compared to that of a device that has a continuously grown ZnO layer without any treatment steps. Meanwhile, treatment steps without introducing reactive gases, and simply staying under a low working pressure, aggravated the instability under illuminated NBS due to an increase of oxygen vacancy concentration in
more » ... ZnO layer. From the experiment results, additional oxidation of the ZnO channel layer is proven to be effective in improving the stability against illuminated NBS.
doi:10.4218/etrij.11.0211.0186 fatcat:otkj4vnuerccngppqfejx5m6si