Stable electrical performance of AlGaInP-based red micro-light emitting diode by controlling interfacial morphologies of metal contacts

Da Hoon Lee, Tae Yeon Seong, Hiroshi Amano

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The stable electrical performance of micro-light-emitting diodes (micro-LEDs) is critical to display application. We investigated the effect of the interface morphologies of contacts to n-AlInP on the electrical stability of AlGaInP-based red micro-LEDs. Regardless of chip sizes (100 µm or 10 µm-size), micro-LEDs with Pd/Ge contacts gave lower and stable forward voltages than those with AuGe/Ni/Au contacts. When annealed at 450 °C, the AuGe/Ni/Au contact underwent seriously inhomogeneous interfacial reactions, resulting in a large variation of interfacial morphologies across the whole contact/AlInP interface. However, the Pd/Ge contact exhibited similar morphologies across the whole interface when annealed. Further, when operated at 800 A/cm2, micro-LEDs with the Pd/Ge contacts underwent less electrical degradation than the ones with the AuGe/Ni/Au contacts. Based on the electrical and scanning transmission electron microscope (STEM) results, the unstable electrical behavior of red micro-LEDs with the AuGe/Ni/Au contact is discussed.

Original languageEnglish
Article number159629
JournalJournal of Alloys and Compounds
Volume872
DOIs
Publication statusPublished - 2021 Aug 15

Keywords

  • AlGaInP-based red micro-LED
  • AuGe/Ni/Au
  • Interfacial morphology
  • Pd/Ge
  • Unstable electrical property

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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