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1 April 2005 InGaN laser diodes by molecular beam epitaxy
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Semiconductor nitrides have many applications for optoelectronic devices; particularly, blue-violet laser diodes (LDs) are required for blu-ray optical disc systems. Molecular beam epitaxy (MBE) with its fine control of growth parameters and capability for in-situ growth monitoring is a well-established technique for depositing III-V heterostructures. Indeed, many commercial infrared LDs are grown very successfully by MBE. However, MBE-growth of nitrides is much more difficult, because providing enough nitrogen atoms at the growth surface, sustaining the high growth temperatures as well as finding the right growth parameters have proved to be very challenging. We recently reported the first InGaN LDs by MBE, showing that those problems can be solved in practice as well as demonstrating the capability of MBE to produce high-quality optoelectronic devices. As the efficiency of nitrides depends strongly on the growth process, structural differences of MBE over metal-organic vapor phase epitaxy (MOVPE)-material may also lead to device advantages. Our first InGaN LDs were grown on sapphire templates, with a pulsed room-temperature threshold current-density of 30 kA/cm2 and a threshold voltage of 33 V. Here, we report on MBE-grown 405 nm InGaN LDs on freestanding GaN substrates, with threshold current-densities <10 kA/cm2 and threshold voltages <10 V, approaching state-of-the-art values. We will report on details of the material quality and LD structure; and will discuss the advantages of MBE-grown LDs over MOVPE-LDs, resulting from fine growth control and no requirement for p-dopant activation. Therefore, the MBE-growth of nitrides has opened a new approach to efficient optoelectronic devices.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Kauer, J. Heffernan, S. E. Hooper, V. Bousquet, K. Johnson, and C. Zellweger "InGaN laser diodes by molecular beam epitaxy", Proc. SPIE 5738, Novel In-Plane Semiconductor Lasers IV, (1 April 2005);

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