Alpha 303 i

Machines of the thermal and diffusion class are process tools used to apply controlled heat to semiconductor wafers in an enclosed environment. They are used to drive material changes that depend on temperature, time, and the surrounding atmosphere inside the process chamber.

Such systems are part of mature wafer processing where thermal energy is used to form, modify, or stabilize films and device structures. The class includes equipment that supports diffusion-related steps as well as other furnace-based thermal treatments.

A thermal and diffusion furnace heats wafers in a controlled chamber using a programmed temperature profile and a selected process atmosphere. The heat may be supplied in a tube or similar enclosed process region, and the wafers are exposed to the thermal environment long enough for diffusion, oxidation, annealing, or related reactions to occur.

The process depends on uniform temperature control, stable gas flow, and repeatable wafer positioning or transport within the hot zone. By controlling these conditions, machines of this class can produce predictable changes in film chemistry, dopant behavior, stress state, or crystal quality.

Machines of this class are generally used for diffusion-related processing, thermal annealing, oxidation, drive-in treatments, and other furnace-based heat steps in semiconductor manufacturing. They are also used wherever controlled thermal exposure is needed to change electrical or structural properties of wafer materials.