High-performance polysilicon thin film transistors on steel substrates

Ming Wu, Yu Chen, Kiran Pangal, James C. Sturm, Sigurd Wagner

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


We fabricated thin film transistors in polycrystalline silicon on steel substrates. The polycrystalline silicon films were made by thermally annealing hydrogenated amorphous silicon precursor films, which had been deposited on stainless steel coated with ∼0.5 μm thick 810°C-annealed SiO2. We employed annealing temperatures ranging from 600°C, which is the furnace annealing temperature limit for conventional glass substrates, to 750°C. Films were crystallized at 650°C in 1 h with 1-h hydrogen plasma seeding, at 700°C in 10 min either with or without hydrogen plasma seeding, and at 750°C in 2 min. The best top-gate transistors were made from films crystallized at 650°C and had an average electron field-effect mobility of 64 cm2/V s in both the linear and saturated regimes. Thus steel substrates permit a substantial reduction in crystallization time over conventional glass substrates, and produce polycrystalline silicon with an electron mobility greater than other substrates.

Original languageEnglish (US)
Pages (from-to)1284-1288
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume266-269 B
StatePublished - May 1 2000
Event18th International Conference on Amorphous and Microcrystalline Semiconductors - Sicence and Technology (ICAMS 18) - Snowbird, UT, United States
Duration: Aug 23 1999Aug 27 1999

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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