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Self-Heating-Effect-Induced Degradation Behaviors in a-InGaZnO Thin-Film Transistors

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9 Author(s)
Tien-Yu Hsieh ; Dept. of Phys., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan ; Ting-Chang Chang ; Te-Chih Chen ; Yu-Te Chen
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This letter investigates degradation behaviors induced by the self-heating effect for amorphous indium-gallium-zinc-oxide (IGZO) (a-IGZO) thin-film transistors (TFTs). Both the surrounding oxide and other thermal insulating material and the low thermal conductivity of the IGZO layer itself cause the self-heating effect in a-IGZO TFTs. The heated channel layer enhances threshold voltage shift, and the evolution of threshold voltage shift is found to be dominated by charge-trapping effect. Further verifications indicate that the degree of threshold voltage shift is dependent on stress power only, and a wider channel leads to more severe self-heating effect.

Published in:

Electron Device Letters, IEEE  (Volume:34 ,  Issue: 1 )

Date of Publication:

Jan. 2013

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