Thermal management and interfacial properties in high-power GaN-based light-emitting diodes employing diamond-added Sn-3 wt.%Ag-0.5 wt.%Cu solder as a die-attach material

Chia Ju Chen*, Chih Ming Chen, Ray-Hua Horng, Dong Sing Wuu, Jhih Sin Hong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The thermal management of high-power GaN-based light-emitting diodes (LEDs) soldered with Sn-3 wt.%Ag-0.5 wt.%Cu (SAC305) solder and diamond-added SAC305 solder was evaluated. Diamond addition was found to significantly reduce the surface temperature and total thermal resistance of the LEDs, revealing that diamond-added SAC305 solder is a promising die-attach material for high-power LED packaging. Interfacial reactions in the LED solder joints were also investigated. The thin Au wetting layer in the chip's backside metallization was rapidly consumed in the initial stage of reflow, forming an AuSn 4 phase at the interface. Subsequently, the AuSn 4 phase detached from the interface, leading to dewetting of the SAC305 solder from the LED chip. To avoid dewetting, a new backside metallization of LED chips should be developed for SAC305 solder.

Original languageEnglish
Pages (from-to)2618-2626
Number of pages9
JournalJournal of Electronic Materials
Volume39
Issue number12
DOIs
StatePublished - 1 Dec 2010

Keywords

  • diamond
  • die-attach materials
  • interfacial reaction
  • light-emitting diodes
  • Thermal resistance

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