Abstract

Hydrogenated amorphous silicon (a-Si:H) thin-film transistors (TFTs) are widely used as controlling devices for picture pixels in liquid crystal displays. In addition to flat panel display applications, a significant research effort focuses on the extension of this technology to circuitry on flexible substrates to build flexible sensor systems. This study investigates the effect of anneal time on the performance of the a-Si:H TFTs on Polyethylene naphthalate (PEN). Off-current is reduced by two orders of magnitude for 48-hours annealed TFT, and the sub-threshold slope become steeper with longer annealing. For positive gate-bias-stress, ΔVt values are positive and exhibit a power-law time dependence (PLTD). The 48-hour annealed TFTs, however, display a turnaround phenomenon (TP) at longer stress times. For negative gate-bias-stress, TFTs annealed for ≥ 24 hours possess a smaller positive ΔVt. They do not follow a PLTD and the TP is observed at longer stress times. The observed ΔVt is explained in terms of the shift in the electron and hole transfer characteristics.

Original languageEnglish (US)
Article number5559345
Pages (from-to)306-310
Number of pages5
JournalIEEE/OSA Journal of Display Technology
Volume7
Issue number6
DOIs
StatePublished - 2011

Fingerprint

Thin film transistors
transistors
Display devices
thin films
time dependence
Flat panel displays
flat panel displays
Polyethylene
Amorphous silicon
Liquid crystal displays
amorphous silicon
Polyethylenes
polyethylenes
electron transfer
Pixels
pixels
liquid crystals
Annealing
slopes
annealing

Keywords

  • Flexible electronics
  • low temperature annealing
  • thin-film transistors (TFTs)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Effect of anneal time on the enhanced performance of a-Si : H TFTs for future display technology. / Indluru, A.; Venugopal, S. M.; Allee, David; Alford, Terry.

In: IEEE/OSA Journal of Display Technology, Vol. 7, No. 6, 5559345, 2011, p. 306-310.

Research output: Contribution to journalArticle

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