Laser-induced nondestructive patterning of a thin ferroelectric polymer film with controlled crystals using Ge8Sb2Te11alloy layer for nonvolatile memory

Insung Bae, Richard Hahnkee Kim, Sun Kak Hwang, Seok Ju Kang, Cheolmin Park

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We present a simple but robust nondestructive process for fabricating micropatterns of thin ferroelectric polymer films with controlled crystals. Our method is based on utilization of localized heat arising from thin Ge8Sb2Te11(GST) alloy layer upon exposure of 650 nm laser. The heat was generated on GST layer within a few hundred of nanosecond exposure and subsequently transferred to a thin poly(vinylidene fluoride-co-trifluoroethylene) film deposited on GST layer. By controlling exposure time and power of the scanned laser, ferroelectric patterns of one or two microns in size are fabricated with various shape. In the micropatterned regions, ferroelectric polymer crystals were efficiently controlled in both degree of the crystallinity and the molecular orientations. Nonvolatile memory devices with laser scanned ferroelectric polymer layers exhibited excellent device performance of large remnant polarization, ON/OFF current ratio and data retention. The results are comparable with devices containing ferroelectric films thermally annealed at least for 2 h, making our process extremely efficient for saving time. Furthermore, our approach can be conveniently combined with a number of other functional organic materials for the future electronic applications.

Original languageEnglish
Pages (from-to)15171-15178
Number of pages8
JournalACS Applied Materials and Interfaces
Volume6
Issue number17
DOIs
Publication statusPublished - 2014 Sep 10

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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