Specific Process Knowledge/Thermal Process/C1 Furnace Anneal-oxide

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Anneal-oxide furnace (C1)

Anneal-oxide furnace (C1). Positioned in cleanroom B-1

The Anneal-oxide furnace (C1) is a Tempress horizontal furnace for oxidation and annealing of silicon wafers. Both 100 mm and 150 mm wafers can be processed in the furnace.

The Anneal-oxide furnace is the top furnace tube in the C-stack furnaces, which positioned in cleanroom B-1. Most of wafers have to do RCA cleaned before they enter the furnace. The only exceptions are the brand new wafers, wafers from the A-stack furnaces, wafers from the LPCVD furnaces (B- and E-stack furnaces) and wafers from PECVD4. Please check the cross contamination information in LabManager before you use the furnace.

O2 is using as oxidant for dry oxidation, and for wet oxidation wafer vapour generated by a steamer is being used as oxidant. The oxidation recipes on the furnace are named e.g. "WET1000" and "DRY1000", where "WET" or "DRY" indicates whether it is a wet or dry oxidation process, and the number indicates the oxidation temperature.

Annealing can be done for silicon samples with layers of e.g. silicon oxide, silicon nitride, polysilicon or BPSG glass (deposited in PECVD4). The annealing recipes are named e.g. "ANN1000" (for annealing at 1000 C).

The oxidation and annealing temperature can be up to 1100 C.

The user manual, technical information and contact information can be found in LabManager:

Anneal-oxide furnace (C1)

Process knowledge

• WET oxidation: with steamer
• DRY oxidation: look at the Oxidation page
• Annealing: look at the Annealing page

Overview of the performance of Anneal Oxide furnace and some process related parameters

Purpose	Oxidation of 100 mm and 150 mm wafers Annealing of 100 mm and 150 mm wafers	Oxidation: Dry Wet: with RASIRC steamer
Performance	Film thickness	Dry SiO2: 50Å to ~2000Å (it takes too long to grow a thicker oxide) Wet SiO2: 50Å to ~5µm (it takes too long to grow a thicker oxide)
Process parameter range	Process Temperature	800-1150 oC
	Process pressure	1 atm
	Gas flows	N2: 0-10 slm O2: 0-10 slm Steamer flow : 0-25 liter/minute
Substrates	Batch size	1-30 100 mm or 150 mm wafers (or 50 mm wafers) per run
	Substrate materials allowed	New silicon wafers (No need RCA cleaned) Silicon wafers with layers of silicon oxide or silicon (oxy)nitride (RCA cleaned) Wafers from the LPCVD furnaces Wafers from PECVD4