A phase change material is formed over a dielectric material. An impurity is introduced into the dielectric to improve the adherence of said dielectric to said phase change material.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a divisional of U.S. patent application Ser. No. 10/965,129, filed Oct. 14, 2004, now U.S. Pat. No. 7,338,857.
