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Equilibrium vapor composition in the Pb - I2 system and mass transport in the PbI2 - I2 system

Ivan V. Kurilo 1Oksana V. Rybak 2Ivan M. Bordun 2

1. Lviv Polytechnic National University, Semiconductor Electronics Department, Bandera Street, 12, Lviv 79013, Ukraine
2. Lviv Polytechnic National University, Physics Department, Stepan Bandera Street, 12, Lviv 79013, Ukraine


The wide band gap semiconductor lead iodide (PbI2) present interest from the practical point of view, since the perspective of their utilization for optical recording of information has been established, they are used in detectors of X-ray and gamma-rays, as well as in some other devices.
Large stoichiometric PbI2 single crystals with a low dislocation density can be grown from the vapor phase in the presence of excess iodine. This process, however, has not yet been studied in sufficient detail.
The equilibrium vapor composition in the Pb - I2 system at temperatures from 400 to 2000 K and total pressures from 102 to 105 Pa was assessed by thermodynamic analysis. The results show that the dominant vapor species is PbI2. PbI2 dissociation is significant starting at 1000 - 1300 K depending on the total pressure in the system.
PbI2 transport in the PbI2 - I2 system is analyzed using a model of mass transport in a nonisothermal one-dimensional system of constant volume containing one or two vapor species. The derived equations provide a self-consistent solution to the problem of mass transport and pressure distribution in the system. Experimental results confirm that the rate of mass transport is governed by the source and deposition temperatures and iodine vapor pressure. The optimal conditions of PbI2 crystal growth from the vapor phase are established.


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Presentation: poster at E-MRS Fall Meeting 2004, Symposium D, by Ivan V. Kurilo
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-04-20 11:30
Revised:   2009-06-08 12:55