Partial pressures of zinc(gas) and selenium(2)(gas) over zinc selenide(solid) from optical density measurement
ZnSe has been the primary candidate for blue light emitting diode and laser applications for years due to its wide and direct energy band gap. A major constraint in the full exploitation of ZnSe is the lack of high quality substrates on which high quality epitaxy can be achieved. With a knowledge of the complete thermodynamic data for the ZnSe compound, the most favorable conditions for growing good quality crystals can then be determined. Due to the apparent controversy between some of the thermodynamic data of ZnSe(s), the partial pressures of Zn(g) and Se$\sb2$(g) coexisting with ZnSe(s) samples are derived from the optical density measurements, and the Gibbs energy of formation of ZnSe(s) is calculated. Combined with other thermodynamic data, a third-law analysis is performed, and the results are used to fit the phase diagram data of the Zn-Se system in a self-consistent way with the associated solution model. The agreement with available thermodynamic data and phase diagram data of the Zn-Se system is very good.
"Partial pressures of zinc(gas) and selenium(2)(gas) over zinc selenide(solid) from optical density measurement"
(January 1, 1995).
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