Phase behavior in the CdTe–CdS pseudobinary system

Phase behavior in the CdTe–CdS pseudobinary system

Polycrystalline thin films deposited by coevaporation of CdTe and CdS form metastable single-phase CdTe–CdS alloys. Subsequent heating in a kinetic-enhancing ambient segregates CdTe 1−x S x and CdS 1−y Te y phases from the original alloy phase. The equilibrium miscibility gap between the resulting C...

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Veröffentlicht in:Journal of vacuum science & technology. A, Vacuum, surfaces, and films Vacuum, surfaces, and films, 2002-07, Vol.20 (4), p.1462-1467
Hauptverfasser: McCandless, Brian E., Hanket, Gregory M., Jensen, D. Garth, Birkmire, Robert W.
Format: Artikel
Sprache:eng
Schlagworte:
Binary alloys
Deposition
Evaporation
Heating
Phase equilibria
Phase transitions
Polycrystalline materials
Solubility
Thermodynamics
Thin films
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Zusammenfassung:Polycrystalline thin films deposited by coevaporation of CdTe and CdS form metastable single-phase CdTe–CdS alloys. Subsequent heating in a kinetic-enhancing ambient segregates CdTe 1−x S x and CdS 1−y Te y phases from the original alloy phase. The equilibrium miscibility gap between the resulting CdTe 1−x S x and CdS 1−y Te y alloy phases is determined for CdTe 1−x S x films with initial x ∼ 0.4 treated from 360 to 700 °C. At 625 °C, the equilibrium compositions correspond to published results for mixed crystals. Below 625 °C the miscibility gap widens asymmetrically due to different mixing free energies for S in CdTe and Te in CdS. The solubility thermodynamics are modeled with an excess mixing free energy to account for nonideal mixing behavior.
ISSN:0734-2101
1520-8559
DOI:10.1116/1.1487872