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Heat Spreader Design for Improved Performance and Reliability of II-V Quantum Dot Lasers


We designed heat spreaders to efficiently transfer heat from a III-V epitaxially grown quantum dot laser to a heat sink. This will efficiently remove excess heat and improve many aspects of the laser’s performance including increased output power, improved slope efficiency, decreased threshold current, better wavelength stability, and extended device lifetime. For this project, we simulated the thermal impedance of the laser with an attached diamond or AlN heat spreader using COMSOL. We also designed laser and heat spreader masks and designed a fabrication process for the lasers. In future work, we will manufacture the lasers, flip chip bond them to the heat spreaders, and characterize their performance and reliability.

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