Because of their many superior properties, including a wide band-gap and high breakdown field, which are different to those of conventional semiconductors such as Si and GaAs, compounds such as SiC, III-Nitrides and related materials are currently attracting increasing attention and are being targeted as possible solutions in a variety of problematic fields of electronic application: including high temperature, high power, radiation-resistant and microwave use.
There is no doubt that, when it comes to the study of the structures and defects of materials, there is presently no technique that rivals positron annihilation. The increasing demands for higher accuracy and reliability provide a constant stimulus to the field, and the present work presents the newest and most important scientific discoveries made in the field of positron annihilation.