Improving performance of gaas-based vertical-cavity surface- emitting lasers by employing thermally conductive metal substrate

Woong Sun Yum, Sang Youl Lee, Myung Sub Kim, Su Jung Yoon, Jeong Tak Oh, Hwan Hee Jeong, Tae Yeon Seong

Research output: Contribution to journalArticlepeer-review

Abstract

We investigated the effect of the conducting substrate on the performance of GaAs-based VCSELs, where the substrates were 230 μm-GaAs (reference), 10 μm-GaAs/metal, and 0.5 μm-GaAs/metal. The VCSELs with the 10 μm- and 0.5 μm thick GaAs/metal-substrates produced higher light output power than the reference. For example, the thin GaAs/metal substrate samples showed 16.3%-16.7% higher light output power at 3.0 A than the reference. It was shown that the thin GaAs samples produced 12.2%-14.0% higher power conversion efficiency at 3.0 A than the reference. At a high current region, the metal-substrate samples yielded lower junction temperature than the reference, namely, the thin GaAs samples gave 42 °C-47.4 °C lower junction temperature at 2.0 A than the reference. Further, the thin GaAs samples revealed better light output degradation characteristics than the reference. For instance, the light output of the reference was degraded by 30.2% at 85 °C, whereas the thin GaAs samples were degraded by 20.1%-20.5%. Near-field images and emission profiles demonstrated that the metal-substrate samples suffered from no damage incurred during the VCSEL fabrication process.

Original languageEnglish
Article number015001
JournalECS Journal of Solid State Science and Technology
Volume10
Issue number1
DOIs
Publication statusPublished - 2021 Jan

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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