Publication
Title
Effects of hole self-trapping by polarons on transport and negative bias illumination stress in amorphous-IGZO
Author
Abstract
The effects of hole injection in amorphous indium-gallium-zinc-oxide (a-IGZO) are analyzed by means of first-principles calculations. The injection of holes in the valence band tail states leads to their capture as a polaron, with high self-trapping energies (from 0.44 to 1.15 eV). Once formed, they mediate the formation of peroxides and remain localized close to the hole injection source due to the presence of a large diffusion energy barrier (of at least 0.6 eV). Their diffusion mechanism can be mediated by the presence of hydrogen. The capture of these holes is correlated with the low off-current observed for a-IGZO transistors, as well as with the difficulty to obtain a p-type conductivity. The results further support the formation of peroxides as being the root cause of Negative Bias Illumination Stress (NBIS). The strong self-trapping substantially reduces the injection of holes from the contact and limits the creation of peroxides from a direct hole injection. In the presence of light, the concentration of holes substantially rises and mediates the creation of peroxides, responsible for NBIS. Published by AIP Publishing.
Language
English
Source (journal)
Journal of applied physics / American Institute of Physics. - New York, N.Y., 1937, currens
Publication
Melville : Amer inst physics , 2018
ISSN
0021-8979 [print]
1089-7550 [online]
Volume/pages
123 :16 (2018) , 7 p.
Article Reference
161513
ISI
000431147200043
Note
29th International Conference on Defects in Semiconductors (ICDS), JUL 31-AUG 04, 2017, Matsue, JAPAN
Medium
E-only publicatie
Full text (Publisher's DOI)
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UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 12.06.2018
Last edited 17.09.2021
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