Alpha 808 SCN

Diffusion furnaces are thermal semiconductor processing tools. Diffusion furnaces expose wafer batches to controlled high temperature ambient conditions so dopants, oxidation reactions, anneals, or deposited films can be formed across many wafers in one process run. Thermal tools of this class are commonly used in front end wafer fabrication where uniformity, contamination control, and repeatable temperature history are important.

Diffusion furnaces process wafers in quartz tube assemblies inside heated zones. Process gases are introduced in controlled flows while temperature is ramped, held, and reduced according to the required thermal recipe. The thermal cycle and gas chemistry together determine whether the step performs diffusion, oxidation, annealing, or another furnace based transformation.

Thermal diffusion equipment sits in the wafer fabrication flow among other front end thermal and film forming steps. Furnace processing is commonly used after prior surface preparation or film deposition and before later lithography, etch, implantation, or metrology operations, depending on the device sequence. Batch thermal tools are typically selected where the process requires repeatable treatment of many wafers under the same temperature and ambient conditions.

Furnaces of this class are used for dopant drive in, thermal oxidation, annealing, and related high temperature wafer treatments. Furnace processing also supports polysilicon related and other film or material conditioning steps when the device flow calls for long, uniform thermal exposure across a wafer batch.