Methods and apparatus for producing a semiconductor on glass (SOG) structure include: subjecting an implantation surface of a donor semiconductor wafer to multiple ion implantation processes to create an exfoliation layer in the donor semiconductor wafer, wherein at least one of: (i) the type of ion, (ii) the dose, and/or (iii) the implantation energy of at least two of the multiple ion implantation processes differ from one another.