Final answer:
True, a wafer refers to a thin slice of semiconductor material like silicon, used for constructing microcircuits via processes of diffusion and deposition, and is integral to creating semiconductor devices such as integrated circuits.
Step-by-step explanation:
A wafer, in the context of semiconductor manufacturing, indeed refers to a thin slice of semiconductor material, such as silicon, which serves as the substrate for the construction of integrated microcircuits. The production of these microcircuits involves precision processes such as diffusion and deposition of various materials onto the silicon wafer.
Purity is paramount in wafer preparation to ensure the proper functioning of the semiconductor devices. The process of doping introduces controlled impurities into the silicon to alter its electrical properties, enabling the creation of components like transistors and diodes within an integrated circuit (IC).