Faceting in AlN bulk crystal growth and its impact on optical properties of the crystals

被引：57
作者：
Bickermann, Matthias [1 ]
Epelbaum, Boris M. [2 ]
Filip, Octavian [2 ]
Tautz, Barbara [1 ]
Heimann, Paul [2 ]
Winnacker, Albrecht [1 ]
机构：
[1] Univ Erlangen Nurnberg, Dept Mat Sci I MEET 6, Martensstr 7, D-91058 Erlangen, Germany
[2] CrystAl N GmbH, D-91058 Erlangen, Germany
来源：
PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 9, NO 3-4 | 2012年 / 9卷 / 3-4期
关键词：
AlN; growth from vapour; crystal facets; zonar structure; optical properties; SINGLE-CRYSTALS;
D O I：
10.1002/pssc.201100345
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
The surface of bulk AlN single crystals grown by PVT on Al-polar (0001) seeds is typically constructed from prismatic, pyramidal, and basal plane facets. Simultaneous growth on different facets with different surface kinetics leads to formation of a zonar structure which is visible due to local differences in coloration in the wafers. Four zones on an AlN wafer representing 1 growth on {10 (1) under bar3} pyramidal facets, 2 growth adjacent to ridges and (0001) basal plane facets, and 3+4 outer and centre areas corresponding to surface depressions are investigated. They show striking differences in optical absorption (OA) spectra, cathodoluminescence (CL) spectra and chemical analysis (SIMS). In areas near ridges and (0001) facets and in centres of depressions, deep-UV absorption as well as luminescence is significantly increased. We assign OA and CL bands observed in these zones to the presence of carbon and/or the lack of oxygen due to local segregation effects caused by faceting. (C ) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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收藏
页码：449 / 452
页数：4
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