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Modeling of Flux Composition for Thermal CdCl2:O2 Annealing of Polycrystalline CdTe

Published online by Cambridge University Press:  01 February 2011

Jaan Hiie ,
Vello Valdna  and
Andres Taklaja
Jaan Hiie
Affiliation:
Department of Materials Science, Tallinn Technical University, 5 Ehitajate Street, 19086 Tallinn, Estonia
Vello Valdna
Affiliation:
Department of Materials Science, Tallinn Technical University, 5 Ehitajate Street, 19086 Tallinn, Estonia
Andres Taklaja
Affiliation:
Department of Radio and Communication Engineering
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Abstract

Differential thermal analysis (DTA) measurements were carried out in order to investigate thermal properties of model flux compositions of CdTe-CdCl2 with CdTeO3, the last recognized as a main oxidation product of CdTe. The composition of the flux was chosen to obtain larger quantity of residual flux phases for analyses and the presence of solid CdTe phase (about 20 mol%) at the fusion temperature 520 °C in a vacuum-closed isothermal quartz ampoule. Quantity of CdTeO3 constituted 20 mol % of the whole sample mass. DTA curves taken in the 300-700°C interval reveal considerable lowering of melting and solidification temperatures for the flux with addition of CdTeO3. The fused batches were vacuum annealed at 470 °C in a long narrow quartz tube for separation and deposition of volatile components CdCl2 and Te at the room temperature part of the tube. After vacuum annealing the residual CdTe phase on the batch with tellurite was coated with transparent platelike crystals morphologically typical to the CdTeO3, while oxide-free batch had no alien phases. In the flux, CdCl2 has a role of catalytic agent forming low melting point composition with native oxides and CdTe. After processing, CdCl2 can be separated by vacuum annealing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 763: Symposium B – Compound Semiconductor Photovoltaics , 2003 , B8.22
Copyright
Copyright © Materials Research Society 2003

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