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Growth and Electron Microscopical Investigations of (CaBa)F2 Epitaxial Layers on GaAs and InP Substrates

✍ Scribed by Dr. B. Schumann; Prof. Dr. sc. nat. G. Kühn; Dr. G. Wagner


Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
668 KB
Volume
21
Category
Article
ISSN
0232-1300

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✦ Synopsis


Growth and Electron Microscopical Investigations of (CaBa)Fs Epitaxial Layers on GaAs and InP Substrates (CaBa)Fa layers have been grown on (100)-oriented GaAs and I n P substrates by flash evaporation technique. They were investigated by means of electron microscopical methods (RHEED, TED, TEM). Epitaxial growth was found a t temperatures in the range of 725 to 825 K for GaAs Substrates and 700 to 800 K for InP substrates, respectively. The films showed a fine-grained structure end consisted of two phases always with a composition of approximately Cao.ggBao.olF, and Cao.o8Bao.g2F2. This is in accordance with the occurrence of a miscibility gap observed in the binary CaF,-BaF, system.

(Ca, Ba)Fa-Schichten wurden auf (lOO)-orientierte GaAs-und InP-Substrate abgescliieden (Flash-Verdampfung) und mittels elektronenmikroskopischer Verfahren untersucht. Epitaktisches Wachstum trat bei Substrattemperaturen zwischen 726 und 825 K (GaAs) bzw. 700 und 800 K (InP) auf. Die Schichten bestanden immer BUS zwei Phaaen und wiesen eine feinkornige Struktur auf. Die Zusammensetzung betrug etwa Cao,saBao,oiF, und Cao,osBao,o2F2. Dies entspricht dem binaren CaF,-BaF, System mit einer ausgedehnten Mischungslucke im Phasendiagramm.


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A-oriented GaAs substrates by flash evaporation in the substrate temperature range Tsub = 570 ... 870 K. Epitaxialgrowth begins at Tsub = 645 K. The films had always the chalcopyrite structure. Indications to a transition from the chalcopyrite phase to the sphalerite phase were observed at Tsub = 87