WP3_Bham; 15May 2014; John Wilson1 Heated plate curing Tests with 130nm hybrids and glass ASICs i) Room temp curing the glue thickness is controllable.

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Presentation transcript:

WP3_Bham; 15May 2014; John Wilson1 Heated plate curing Tests with 130nm hybrids and glass ASICs i) Room temp curing the glue thickness is controllable (can now reliably achieve ~80 microns) shear test locally (on Dage 4000) try to estimate in each case the fractional coverage glue over the ASIC area. ii) Heated plate curing Hybrid panel (+35C)Panel vacuum jig Metal block Heating element Insulating sheet of glass 1

WP3_Bham; 15May 2014; John Wilson2 Tests with glass ASICs 5 hybrids glued and cured at room temp; 5 hybrids glued and cured with heated plate. All hybrids (except those over-glued) shear tested on Dage 4000 after the curing has ended. Usually one (+ -1) ASIC shears off leaving hardly any glue stain on the hybrid pad. Is the surface clean? Surfaces are wiped with alcohol but more may be required ( as Luise and Dennis had found). Try cleaning with Safewash next. 2

WP3_Bham; 15May 2014; John Wilson3 All data collected from shear tests Many of the lower results are where there has been a failure at the glue/substrate interface, possibly due to the hybrid surface not being clean

WP3_Bham; 15May 2014; John Wilson4 Not enough glue due to something blocking the stencil holes – next slide. Omit pts with little glue adhering to ASIC pads.

WP3_Bham; 15May 2014; John Wilson5 ASIC with anomalously low shear strength: 2.7kg After curing Glue on ASIC; stencil removed Hybrid after shear ASIC after shear Glue on stencil -> ensure stencil is clean before use.

WP3_Bham; 15May 2014; John Wilson kg kg kg kg kg kg kg kg kg Glue/Substrate failure 8.671kg Glue/Substrate failure % Coverage 44% 63% 78% 57% 58% 54% 46% 52% 56% 51% Heated plate Glass ASICs after gluing Hybrid pads after shear testing

WP3_Bham; 15May 2014; John Wilson7 Hybrid glued with a pre-heated ASIC vacuum jig. Due to expansion it made the stencil tricky to get on properly and led to too much glue being stencilled on. Average Glue thickness is 75µm This has so far been a one-off. Decide not to preheat the ASIC vacuum jig. Hybrid glued without preheating the ASIC vacuum jig. Stencil fitted on much more easily and because of that the correct glue volume was stencilled on. Average glue thickness is 80µm Although: - P.T.O

WP3_Bham; 15May 2014; John Wilson8 Production still tricky: e.g. too much glue!

WP3_Bham; 15May 2014; John Wilson9 Conclusions No clear correlation between shear strength and glue thicknesses No apparent difference in shear strength between the two methods (room temp and heated plate curing) Avoid differential expansion between ASIC vac jig and stencil by keeping vac jig at room temp (like stencil). Systematic effects becoming apparent with experience/practice e.g. glue dots slightly larger for ASICS 7,8, 9 as glue is applied here in overlapping swipes. Still scope for putting down variable amounts of glue ! Using up glass ASICS at quite a rate! Can anyone spare some, please? 9

WP3_Bham; 15May 2014; John Wilson10 Other news Dry storage cabinets (Almit) have been delivered but ….. … without the nitrogen circulator. Oversight on our side. But not a problem – money is still available. The missing unit (bolt-on) has now been ordered. 10