Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5466448 | Thin Solid Films | 2016 | 21 Pages |
Abstract
Hafnium-aluminum zinc oxide (HAZO) films as an active layer of oxide-transistors with different hafnium (Hf) contents were deposited via co-sputtering of separate targets. The effects of the sputtering power during co-sputtering on the structural, optical, electrical, and chemical properties of the HAZO films were examined. As the sputtering power increased, the structure of the HAZO films changed from polycrystalline to amorphous, and the HfO bonds in the HAZO films increased, but the ZnO bonds decreased. Also, a bottom-gate-type thin-film transistor (TFT) using the HAZO film as its channel layer was fabricated and characterized. The TFTs using HAZO layer at room temperature as channel layer exhibited the device characteristics, such as a field effect mobility of 0.45 cm2/V·s, a threshold voltage of 17.18 V, a subthreshold swing of 0.85 V/decade, an on/off current ratio of 3.68 Ã 107, and a visible transmittance of 82.7%. It was discovered that the changes of the electrical characteristics of the HAZO TFTs were closely related to the changes of the ZnO/HfO bonding ratio.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Sang-Hyuk Lee, Hyun-Sik Jun, Ju-Hee Park, Won Kim, Saeroonter Oh, Jin-Seok Park,