R. Bradford 3 February, 2016.  BNL offered to share 4” wafer. We purchased ¼ of the wafer with the remainder being used for silicon drift detectors for.

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Presentation transcript:

R. Bradford 3 February, 2016

 BNL offered to share 4” wafer. We purchased ¼ of the wafer with the remainder being used for silicon drift detectors for Maia. 4 wafers will be fabricated with 2 different resistivities:  n n-type silicon  5 k Ω and 10 k Ω (2 wafers of each type)  500  m-thick  Fabrication began last spring  Completion date has slipped twice due to equipment failures at BNL  Expecting devices in May  We’ll go to BNL to do initial testing/characterization.

Device # Overall Size (  m)Implant Size (  m) Notes standard guard rings standard guard rings 35200VariedTest sensor with varied pixel structure and 11 standard guard rings VariedTest sensor with varied pixel structure and 7 wider guard rings standard guard rings standard guard rings

Cut line Single guard ring – 315  m wide. Indices number pixel rows and columns (on n- implant and metal layers) Pixel matrix – 32 x 32 Bond contacts for grounding guard ring. Single p-stop ring outside of guard ring Distance from p-stop to cut edge – 655  m (5200  m sensors) or  m (5400  m sensors).+

Large backside p-implant with metal layer. Implant is 3590  m wide. Guard ringsBack-side n-implant just inside cut line. Distance from outer guard ring to edge of sensor:  m (5200  m sensors) or 474  m (5400  m sensors).

Large back-side implant Back-side metal First guard ring Third guard ring Second guard ring Gap between guard rings = (n* )  m Metal away from pixels: 5  m (constant) Metal toward pixels = (n + 1.0)  m P-implants: 12  m (constant)

Back-side metal Large back-side implant First guard ring Second guard ring Third guard ring Implants are a constant 25  m. Gaps increase at a rate of 1.5  m/guard ring. Metal overhang toward pixels grows by 1.0  m/guard ring. Metal overhang away from pixels is a constant 5  m.

Corner radius is radial position measured from (-1600, 1600) Note: 11 guard rings for 5200  m sensors; 13 guard rings for 5400  m sensors.

Guard ring Outer P-stop Gap between pixel metal and p-stop = 2.5  m Pixel metal overhang; GR metal overhang toward pixels = 2.5  m (both)

Gap between pixel metal and p-stop = 4.5  m Pixel metal overhang; GR metal overhang toward pixels = 3.0  m (both)

Two designs incorporate “test pixels” where the inner pixel array has been divided into ~8 sub-groups with varied parameters. Varied implant size, p-stop width, gap between p-stop and pixel implant, etc.

Subset of sensors have probe contacts on p- stop. Idea was suggested by BNL as a possible means of testing the sensors from one side by biasing the p-stop. Nobody was sure it would work, but we put these on a few of the sensors.

Same layer structure as bump bonding contacts – metal (green) with vias (purple) to contact the p-stop implant. There are also openings in passivation and vias layers, which are not shown at left. This structure was specified by BNL for bond openings.

Single diode with same dimensions as typical sensor. Periphery is also similar.

62 devices on each wafer.

Sensor NumberNotesNumber of Devices  m, 80  m pixels, 11 guard rings  m, 54  m pixels, 11 guard rings  m, varied pixels, 11 guard rings  m, varied pixels, 7 wide guard rings  m, 80  m pixels, 13 guard rings  m, 54  m pixels, 13 guard rings 13 Test Diode 5200  m, single diode 1