Effects of point defect distribution on arsenic precipitation in low-temperature grown III-V arsenides

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Title:	Effects of point defect distribution on arsenic precipitation in low-temperature grown III-V arsenides
Authors:	Chang,MN;Hsieh,KC;Nee,TE;Chyi,JI
Contributors:	電機工程研究所
Keywords:	MOLECULAR-BEAM EPITAXY;CHARGED GA VACANCIES;POSITRON BEAM;LAYERS;DEVICES;MESFETS;MBE
Date:	1999
Issue Date:	2010-06-29 20:20:29 (UTC+8)
Publisher:	中央大學
Abstract:	The behavior of As precipitation in low-temperature grown III-V arsenides is investigated and correlated with the doping level, crystal bond strength, and dislocation density. Experimental results reveal that the doping level affects the concentration of charged defects, such as vacancy and antisite point defects, and hence leads to the selective precipitation of excess As in homojunctions. For heterostructures, As precipitates tend to condense in materials with a lower bond strength due to differences in point defect concentrations between the materials. In addition, dislocations are found to be a vacancy source that facilitates As precipitation around them. These results indicate that column III vacancies play an important role in As precipitation of low-temperature grown III-V arsenides. (C) 1999 American Institute of Physics. [S0021-8979(99)07917-7].
Relation:	JOURNAL OF APPLIED PHYSICS
Appears in Collections:	[Graduate Institute of Electrical Engineering] journal & Dissertation

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