Structural modification of Ge-Se amorphous films with the addition of Sb

Extended X-ray absorption fine-structure (EXAFS) measurements were undertaken to understand the structural modi. cation of amorphous Ge - Se films that occurs with the addition of Sb. We found that Ge - Ge bonds exist along with Ge - Se bonds in Ge-rich Ge - Se films. These bonds disappear with increasing Se content, to the extent that Ge - Se bonds predominate in stoichiometric GeSe2 films. When Ge is replaced by Sb, stable Sb - Se bonds are formed; concurrently, the proportion of Ge - Ge bonds is decreased at the expense of Ge - Se bonds. As a result, GeSbSe glasses have a more stable and stronger network structure.