Phase behavior in the CdTe–CdS pseudobinary system

Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films - Tập 20 Số 4 - Trang 1462-1467 - 2002
Brian E. McCandless1, Gregory M. Hanket1, D. G. Jensen1, Robert W. Birkmire1
1Institute of Energy Conversion, University of Delaware, Newark, Delaware 19716

Tóm tắt

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 CdTe1−xSx and CdS1−yTey phases from the original alloy phase. The equilibrium miscibility gap between the resulting CdTe1−xSx and CdS1−yTey alloy phases is determined for CdTe1−xSx 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.

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Thông tin xuất bản

Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films

Tập 20 Số 4

1462-1467

Thông tin tác giả