Back-Contacted Carrier Injection for Scalable GaN Light Emitters

Iurii Kim*, Christoffer Kauppinen, Ivan Radevici, Pyry Kivisaari, Jani Oksanen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
57 Downloads (Pure)

Abstract

It has recently been proposed that back-contacted III-V light-emitting diodes (LEDs) could offer improved current spreading as compared to conventional mesa or double side contacted structures. This has inspired also experimental efforts to realize such structures, but fabrication methods for them have not yet been fully established. Herein, the use of unintentionally doped and partially carrier-selective contacts (SC) is studied to realize back-contacted indium gallium nitride (InGaN) LEDs. The sharp electroluminescence peak at 439 nm from the multiquantum well stack demonstrates that the approach allows fabricating back-contacted InGaN LEDs without intentionally doped n-GaN layers and without inflicting damage in the active region, often observed in alternative approaches relying on lateral doping and the use of high energy particles during fabrication. The samples are fabricated on a finger configuration with several finger widths between 1 and 20 mu m. It is observed that the emission spreads most uniformly throughout the structure for fingers with the width of 5 mu m. As shown by the simulations, with improved contact resistances, the structures reported herein could enable fabricating back-contacted LEDs with unity injection efficiency and improved current spreading, offering a path toward large-area LEDs without contact shading even in materials where n-doping is elusive.

Original languageEnglish
Article number2100461
Number of pages7
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume219
Issue number2
Early online date23 Nov 2021
DOIs
Publication statusPublished - Jan 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • diffusion injection
  • III-nitrides
  • light-emitting diodes (LEDs)
  • metalorganic vapour-phase epitaxy (MOVPE)

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