کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9821590 | 1518988 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydrogen behaviour in novel materials for spintronic: GaFeN codoped with Mg, Si and Al
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
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چکیده انگلیسی
Hydrogen plays an important role in GaN and related alloys. It is often a part of the growth environment and can be incorporated in GaN during different processing steps. Its behaviour is rather complicated and poorly understood. GaN doped with Fe has currently gained an increasing interest as a suitable magnetic semiconductor for spintronic applications. Here, we report results of the study on GaN doped with Fe and codoped with Mg for deep acceptors, Si for shallow donors and isoelectronic Al. Samples were grown by the chemical transport process in the form of small (â¼0.3Â mm) crystallites and subsequently pressed to form platelets. As-grown samples and after annealing in different atmospheres (successively with N2 and NH3) were studied. Hydrogen concentrations were determined by NRA using the 15N profiling method. Hydrogen release due to the analysing beam was evaluated using the molecular recombination model. Effective H-release cross section was found to be the same for all GaFeN samples, independent of codoping. The lowest concentration of hydrogen among as-grown materials was revealed in GaFeN samples. Codoped materials showed higher hydrogen concentration, increasing in the following sequence: Mg, Si and Al. Hydrogen concentration can be substantially reduced by annealing in N2 atmosphere, whereas subsequent annealing in NH3 produces hydrogenation, however, to concentrations below that for pristine samples. The model of these processes has been proposed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 78, Issues 2â4, 30 May 2005, Pages 285-290
Journal: Vacuum - Volume 78, Issues 2â4, 30 May 2005, Pages 285-290
نویسندگان
Andrzej Turos, A.M. Abdul-Kader, SÅawomir PodsiadÅo, Beata Strojek, Ireneusz StrzaÅkowski, Dieter Grambole,