Mass spectroscopic characterization of the GeSe: GeI4 vapor transport system

The GeSe: GeI4 vapor crystal growth system was characterized mass spectroscopically. A steady-state Knudsen effusion technique was developed to simulate the equilibrium conditions at one end of a vapor transport ampoule. It was found that the previously neglected equilibrium GeSe2(s) = GeSe(v)+12Se2(v) reduces the Se2(v) concentration to an extent that sublimation/ condensation of GeSe becomes the dominant transport mechanism. At total pressure...