Selective photo-thermal modulation of ZnO/Pt interface for monolithic 3D integration of oxide-based resistive random access memory

Chul Jin Park, Jin Whan Kim, Seok Daniel Namgung, Jang Yeon Kwon, Moo Whan Shin

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5 Citations (Scopus)


Selective and localized process technology is a key enabler for the monolithic three-dimensional (M3D) integration of high-performance oxide-based resistive random access memory (RRAM) which is emerging as a post-flash nonvolatile memory solution. In this work, a photo-thermal laser process in a ZnO/Pt multi-layered structure is proposed as a new strategy to modulate the crystallinity at the ZnO/Pt interface and the oxygen vacancy (VO) distribution in the ZnO layer. Intensive optical and thermal simulation has been utilized for the optimized laser processing of the ZnO/Pt interface. It is verified that the optimized laser process can produce a thin ZnO crystallized layer on the ZnO/Pt interface and a significant concentration gradient of VO within the ZnO layer, without any deformation of the multi-layered structure. The switching characteristics of the laser-processed Pt/ZnO/Pt RRAM reveal that the laser process can increase the RHRS/RLRS ratio by up to tenfold and decrease the VSET by about 25%. The reliability of the RRAMs is also considerably improved. Our research demonstrates that the photo-thermal approach is a very promising method for improving oxide-based RRAM performance while meeting the critical requirements of M3D integration.

Original languageEnglish
Article number146380
JournalApplied Surface Science
Publication statusPublished - 2020 Aug 1

Bibliographical note

Funding Information:
This research was supported by the MIST (Ministry of Science and ICT), Korea , under the “ICT Consilience Creative Program” (IITP-2019-2017-0-01015) supervised by the IITP (Institute for Information & communications Technology Planning & Evaluation) .

Publisher Copyright:
© 2020 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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