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11 October 2005 Potential of MBE for gallium nitride based lasers
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Up until recently the successful growth of nitride optoelectronic devices had been demonstrated only with Metal Organic Vapor Phase Epitaxy (MOVPE) due to the possibility of growth of GaN at temperatures which exceed 1000C. Molecular Beam Epitaxy (MBE) seemed to be less adapted for this purpose. It was believed that MBE can give good results only if the growth conditions are close to these used in MOVPE reacotors. Indeed, the first successful growth of laser diode (LDs) was obtained using ammonia MBE at temperatures as high as 950oC. The new perspective has been opened recently by successful growth of LD structures on nearly dislocation free GaN bulk substrates using Plasma Assisted MBE at much lower temperatures of 590-710oC. The laser structures are deposited on the high-pressure-grown low dislocation bulk GaN substrates taking full advantage of the so called adlayer enhanced lateral diffusion channel for adatoms below the dynamic metallic cover. Devices grown by PAMBE on bulk substrates compare very favorably to the early laser diodes fabricated using the MOVPE technique, providing evidence that the relatively low growth temperatures used in this process pose no intrinsic limitations on the quality of the optoelectronic components. This opened up a number of new possibilities to the low temperature PAMBE including high power blue LDs, green and UV LDs, and quantum cascade lasers.
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S. Porowski and C. Skierbiszewski "Potential of MBE for gallium nitride based lasers", Proc. SPIE 5958, Lasers and Applications, 59580Z (11 October 2005);

Gallium nitride

Semiconductor lasers



Quantum wells

Optoelectronic devices


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