Preparation of Bulk AlN Seeds by Spontaneous Nucleation of Freestanding Crystals

Autor:	Carsten Hartmann, Andrea Dittmar, Klaus Irmscher, Frank Langhans, Albert Kwasniewski, Tom Neugut, Matthias Bickermann, Juergen Wollweber
Rok vydání:	2013
Předmět:	Core (optical fiber) Secondary ion mass spectrometry Full width at half maximum Crystallography Materials science Reflection (mathematics) Edge region General Engineering General Physics and Astronomy Spontaneous nucleation Facet Crystal habit
Zdroj:	Japanese Journal of Applied Physics. 52:08JA06
ISSN:	1347-4065 0021-4922
DOI:	10.7567/jjap.52.08ja06
Popis:	Freestanding AlN single crystals are grown in a RF-heated furnace by physical vapor transport (PVT). Three different growth regimes with growth temperatures between 2080–2200°C result in different crystal habits and very high structural quality. The Rocking curves show FWHM < 21 arcsec in the 0002 and 101̄0 Reflection on the as-grown facets. Isometric AlN crystals with sizes up to 10 × 10 × 12mm3 show a zonar structure consisting of a yellowish core area which is grown on the N-polar (0001̄) facet and a nearly colorless edge region grown on prismatic {101̄0} facets. In the two growth zones nearly the same C concentrations but different amounts of O and Si are measured by secondary ion mass spectrometry (SIMS). The yellowish core area show a very low defect density (EPD ⩽ 100 cm−2) and a higher deep UV transparency compared to the edge region.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c6050dc5a5e26be000bc74ce7a0e568c https://doi.org/10.7567/jjap.52.08ja06 Zobrazit plný text záznamu