geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Study on growing thick AlGaN layer on c-plane sapphire substrate and free-standing GaN substrate


, : Study on growing thick AlGaN layer on c-plane sapphire substrate and free-standing GaN substrate. SCIENCE CHINA Physics, Mechanics & Astronomy 55(12): 2383-2388

In this study, the thick AlGaN epilayers have been grown on the c-plane sapphire substrate and the free-standing GaN substrate using low-temperature AlN nucleation layers by low-pressure metal-organic chemical vapor deposition (LPMOCVD). High resolution X-ray diffraction (HRXRD), atom force microscopy (AFM), scanning electron microscopy (SEM), photoluminescence (PL) and Raman scattering measurements have been employed to study the crystal quality, threading dislocation density, surface morphology, optical properties and phonon properties of thick AlGaN epifilms. The results indicate that AlGaN epifilms crystal quality can be improved greatly when grown on the free-standing GaN substrate. We calculated the threading dislocation density and found that thick AlGaN epifilm grown on the free-standing GaN substrate is much lower in total threading dislocation density than that grown on the sapphire substrate, although the surface morphology is rougher than that of sapphire substrate.

US$19.90

DOI: 10.1007/s11433-012-4926-z


Other references

D.I.rio Mimi; Richmond Bruce M.; Moore Laura J., 2003: A GIS-based approach to coastal change assessment in Santa Cruz County. Along the tectonically active Santa Cruz County coastline, the natural processes and human activities influencing coastal change are dynamic, complex, and often difficult to quantify. The advancement of Geographic Information System (GIS) technolo...

Piechotowski, I.; Weidner, U.; Zöllner, I.; Gabrio, T.; Link, B.; Schwenk, M., 2002: Serum selenium levels in school children: results and health assessment. In Germany, where geogenic selenium concentrations are low, only few data on selenium status in children are available. Aim of the study was to investigate serum selenium concentrations of children in a population-based sample and to additionally...

Krell, Frank-Thorsten, 2002: Scarabaeus punctatus Villers, 1789 (currently Pentodon bidens punctatus; Insecta, Coleoptera): Proposed conservation of the specific name. The purpose of this application is to conserve the specific name of Scarabaeus punctatus Villers, 1789 (SCARABAEIDAE, DYNASTINAE), which is a junior primary homonym of S. punctatus Linnaeus, 1758 (SCARABAEIDAE, RUTELINAE). Despite the homonymy bot...

Brown, K.N.; Carlsson, J.; Jarra, W., 1990: Preferential invasion of malarial merozoites into young red blood cells. Commentary. Merozoite selection of erythrocytes by age and the induction of protective immunity. Brown, Carlsson and Jarra respond to an article by Mons (Blood Cells (1990) 16, 299- 312) concerning the variation in ability of Plasmodium to invade erythrocytes. They propose a strategy for further investigation, consisting of 3 stages: identifi...

Schroll, C., 2008: Fire detection and alarm systems: a brief guide. Inspection, testing, and maintenance requirements for these systems are extensive and ultimately are likely to cost more than the original installation. Occupational Health & Safety 76(12): 28, 30, 32 Passim-28, 30, 32 Passim

Menounos Brian; Slaymaker Olav, 1998: Duffey Lake sediment archive; the annual, fine-sediment response of a Pacific Northwest mountain catchment to 4000 years of climate change. Variations in sediment flux to a lacustrine basin were analyzed to assess the geomorphic implications of past climate change for a 250 km (super 2) mountain catchment in southwest British Columbia. Recovered lake sediment cores are composed of fin...

Markthaler, G., 2004: A safe method of detecting varroa-resistant colonies. American bee journal 144(10): 755-756

Taylor, J., 2012: Medicines management: The price of variation. Health Service Journal 122(6299): S2-S3

Insel, S.A.; Reese, C.S.; Alexander, B.B., 1968: Self-presentations in relation to internal and external referents. Journal of Consulting and Clinical Psychology 32(4): 389-395

Darrah, H.K.; MacKinnon, P.C.; Rogers, A.W., 1971: Sexual differentiation in the brain of the neonatal rat. Journal of Physiology 218 Suppl: 22p-23p