Some embodiments include a method. The method can include: providing a carrier substrate; forming a first device material over the carrier substrate; and after forming the first device material over the carrier substrate, transforming the first device material into a second device material. Meanwhile, the transforming the first device material into the second device material can include: causing a cationic exchange in the first device material; and causing an anionic exchange in the first device material. The causing the cationic exchange in the first device material and the causing the anionic exchange in the first device material can occur approximately simultaneously. Other embodiments of related methods and systems are also disclosed.