Pulse-Driven Nonvolatile Perovskite Memory with Photovoltaic Read-Out Characteristics

Shu Jui Chang, Syuan Ye Chen, Po Wen Chen, Szu Jung Huang, Yuan Chieh Tseng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

This paper presents a unique GdFe0.8Ni0.2O3 perovskite thin film for use in pulse-controlled nonvolatile memory devices (combined with a SrTiO3 (STO) substrate) without the need for an electrical-stressing read-out process. The use of pulse voltage imposes permanent downward/upward polarization states on GFNO, which enables greater energy density and higher energy efficiency than the unpoled state for memory. The two polarization states produce carrier migrations in opposing directions across the GFNO/STO interface, which alter the depletion region of the device, as reflected in photovoltaic short-circuit current density (Jsc) values. Modulating the duration (varying the number of sequential pulses but fixing the pulse width and delay time) and direction of continuous pulse voltage is an effective method for controlling Jsc, thereby allowing the fabrication of nondestructive, light-tunable, nonvolatile memory devices. In experiments, Jsc in the downward polarized state was approximately 6 times greater than that in the upward polarized state. It is promising that more memory states can be enabled by the proposed heterostructure by selecting appropriate pulse trains. Real-time interfacial changes (relative to the nonvolatile characteristics of the device) were obtained by applying synchrotron X-ray techniques simultaneously with pulse characterization. This made it possible to separately probe the electronic and chemical states of the GFNO (a p-type-like semiconductor) and STO (an n-type-like semiconductor) while varying the pulse direction, thereby making it possible to identify the mechanisms underlying the observed phenomena.

Original languageEnglish
Pages (from-to)33803-33810
Number of pages8
JournalACS Applied Materials and Interfaces
Volume11
Issue number37
DOIs
StatePublished - 18 Sep 2019

Keywords

  • nonvolatile memory
  • perovskite
  • photovoltaic
  • pulse
  • synchrotron

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