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Optica Publishing Group
  • Journal of Display Technology
  • Vol. 5,
  • Issue 12,
  • pp. 515-519
  • (2009)

Self-Aligned Top-Gate Coplanar In-Ga-Zn-O Thin-Film Transistors

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Abstract

Self-aligned techniques are often used in conventional CMOS and Si-based thin-film transistors (TFTs) technologies due to various merits. In this paper, we report self-aligned coplanar top-gate InGaZnO TFTs using PECVD a-SiN<sub><i>x</i></sub>:H patterned to have low hydrogen content in the channel region and high hydrogen content in the source/drain region. After annealing to induce hydrogen diffusion from a-SiN<sub><i>x</i></sub>:H into the oxide semiconductor, the source–drain regions become more conductive and yet the channel region remains suitable for TFT operation, yielding a working self-aligned TFT structure. Such fabrication involves neither back-side exposure nor ion implantation, and thus may be compatible with the typical and cost-effective TFT manufacturing.

© 2009 IEEE

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