Specific Process Knowledge/Thermal Process/Furnace: Multipurpose annealing/Acceptance test

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Multipurpose Anneal furnace acceptance test

The acceptance for the Multipurpose Anneal furnace was performed in November 2014 by ATV Technologie and Danchip.

At the acceptance test a dry oxide layer was grown on a boat of 150 mm wafers. The oxide growth was repeated three times

For each run the oxide thickness and refractive index were measured on three of the wafers, and the standard deviation and non-uniformity were calculated for each wafer, over the boat and from run to run.

Oxidation parameters

Recipe: "vr_dryOx_1000C_120min_150_5Wafer_D1_mit_Inliner_oPurgering.ATV"

Oxidation time: 80 min

Temperature: 1050 ^oC (all temoperature zones)

O₂ flow: 1 slm

The oxidation has been done with 150 mm wafers, and with 30 wafers in the furnace.

Wafer 4 (towards the door), wafer 16 and wafer 28 (towards the service area) were measured in 13 points using the M-2000V ellipsometer.

Results

Oxide thickness

	Date	Wafer 4			Wafer 16			Wafer 28			Center point only
		Average oxide thickness [nm]	St. deviation	Non-uniformity [%]	Average oxide thickness [nm]	St. deviation	Non-uniformity [%]	Average oxide thickness [nm]	St. deviation	Non-uniformity [%]	Average oxide thickness [nm]	St. deviation	Non-uniformity [%]
Run 1	28-01-2015	109.7	1.0	1.7	107.7	0.9	1.1	106.5	0.8	1.2	107.0	2.1	1.9
Run 2	28-01-2015	107.3	1.7	2.4	105.0	1.4	1.7	107.3	0.7	0.9	105.7	1.0	0.9
Run 3	30-01-2015	103.6	0.8	1.1	102.6	0.6	1.2	102.2	0.6	1.1	102.9	1.0	1.0
Average		106.9	1.2	1.7	105.1	1.0	1.3	105.3	0.7	1.1	105.2	1.4	1.3

Run-to-run
Average oxide thickness [nm]	St. deviation	Non-uniformity [%]
105.2	2.1	2.0

Refractive index

	Date	Wafer 4			Wafer 16			Wafer 28			Center point only
		Average refractive index	St. deviation	Non-uniformity [%]	Average refractive index	St. deviation	Non-uniformity [%]	Average refractive index	St. deviation	Non-uniformity [%]	Average refractive index	St. deviation	Non-uniformity [%]
Run 1	28-01-2015	1.46	0.00	0.04	1.46	0.00	0.07	1.46	0.00	0.06	1.4609	0.0004	0.0230
Run 2	28-01-2015	1.46	0.00	0.09	1.46	0.00	0.17	1.44	0.01	0.69	1.4561	0.0094	05873
Run 3	30-01-2015	1.46	0.00	0.06	1.46	0.00	0.05	1.46	0.00	0.07	1.4602	0.0004	0.0291
Average		1.46	0.00	0.06	1.46	0.00	0.10	1.46	0.00	0.27	1.46	0.00	0.21

Run-to-run
Average refractive index	St. deviation	Non-uniformity [%]
1.4591	0.0026	0.1637