InP p-type epitaxial layers grown with the addition of rare-earth elements for use in radiation detection

被引:0
|
作者
Zavadil, J. [1 ]
Prochazkova, O. [1 ]
Zdansky, K. [1 ]
Gladkov, P. [1 ]
机构
[1] Acad Sci Czech Republ, Inst Radioengn & Elect, Prague 18251 8, Czech Republic
来源
关键词
rare-earth elements; InP epitaxial layers; Hall measurements; low-temperature photoluminescence;
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中图分类号
T [工业技术];
学科分类号
08 ;
摘要
InP single crystal layers were grown by liquid phase epitaxy on semi-insulating InP:Fe and n-type InP:Sn substrates with Ce, Pr, Tm, Tm2O3 and Yb additions to the growth melt. Grown layers were examined by low-temperature photoluminescence spectroscopy, C-V and temperature dependent Hall measurements. An efficient purification due to rare earth (RE) admixture has been observed and all reported layers exhibit the change of electrical conductivity from n to p at certain RE concentration in the melt. The highest purifying effect has been found for Pr and Tm2O3, where the impurity concentration was decreased by up to three orders of magnitude and fine luminescence spectral features were revealed. Ce and Yb were found as dominant acceptor impurities responsible for n to p type electrical conductivity change, while the dominant acceptor responsible for the conductivity crossover in the case of Tm and Tm2O3 admixtures remains to be identified.
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页码:1221 / 1226
页数:6
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