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Self-rectifying resistance switching memory based on a dynamic p-n junction.

Changjin Wu1,2, Xiaoli Li3, Xiaohong Xu3

  • 1Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, Yongin 17035, Republic of Korea.

Nanotechnology
|November 4, 2020
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Summary
This summary is machine-generated.

Researchers developed a novel self-rectifying resistance switching memory using a dynamic p-n junction in Li-doped ZnO. This breakthrough addresses sneak-path issues in high-density memory arrays.

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Area of Science:

  • Materials Science
  • Solid-State Electronics
  • Semiconductor Devices

Background:

  • Resistance Random Access Memory (RRAM) is a promising next-generation memory technology.
  • High-density RRAM crossbar arrays face challenges due to sneak-path currents.
  • Integrating rectifying effects with resistance switching is a potential solution.

Purpose of the Study:

  • To develop a self-rectifying resistance switching (SR-RS) device to suppress sneak-path currents.
  • To investigate a novel Li-ion migration-induced dynamic p-n junction for memory applications.
  • To assess the feasibility of the proposed structure for high-density RRAM.

Main Methods:

  • Fabrication of an Au/Li-ZnO/ZnO/Pt device structure.
  • Characterization of resistance switching and rectification properties.
  • Analysis of the dynamic p-n junction formation mechanism via Li-ion migration and defect complex dynamics.

Main Results:

  • The SR-RS device demonstrated forming-free and stable switching with a high resistance ratio (R_OFF/R_ON ~ 10^4).
  • A large rectification ratio of approximately 10^6 was achieved.
  • The Li-ZnO/ZnO bilayer facilitated a dynamic p-n junction by electric-field-driven Li-ion transport and defect complex recombination.

Conclusions:

  • The proposed SR-RS device effectively suppresses sneak-path currents, enabling selection-device-free operation.
  • The dynamic p-n junction mechanism provides a viable route for high-density RRAM.
  • The structure shows potential for realizing high-density RRAM applications, with a calculated maximum array size of ~16 Mbit.