320 likes | 501 Views
Measurements of the first ON Semiconductor production wafers at Udine. Prepared by Diego Cauz on behalf of the group of Udine April 2004 Udine. Measurement speed-up. Doctor Sergey Gorokhov is back in Udine since April 14th. He will stay for 3 months. ON-Semic wafers in Udine.
E N D
Measurements of the first ON Semiconductor production wafers at Udine Prepared by Diego Cauz on behalf of the group of Udine April 2004 Udine
Measurement speed-up • Doctor Sergey Gorokhov is back in Udine since April 14th. • He will stay for 3 months Atlas Pixel Italia Apr 2004
ON-Semic wafers in Udine • We have received 11 ON Semiconductor wafers in April: • 2 partially measured for quick shipping to AMS Atlas Pixel Italia Apr 2004
Visual inspection (VIS)(1/3) Mask Align (H-V) Wafer n-side L n-side R p-side Lp-side R ID marking Atlas Pixel Italia Apr 2004
Visual inspection (VIS)(2/3) Mask Align (H-V) Wafer n-side L n-side R p-side Lp-side R ID marking Bad passivation vernier in the 4th vernier pair on all 4 monitors, both H and V, all wafers. See next slide Atlas Pixel Italia Apr 2004
Many defects, probably scratches on the tiles of 9688-07 Tile 1: 8 scr.s -93 pix Tile 2: 4 scr.s -20 pix Tile 3: 9 scr.s -122 pix Atlas Pixel Italia Apr 2004
Wetting residue Atlas Pixel Italia Apr 2004
Visual inspection (VIS)(3/3) *: AMS communication ~: bad on limited areas Atlas Pixel Italia Apr 2004
9688-10 Atlas Pixel Italia Apr 2004
1203-11 Atlas Pixel Italia Apr 2004
Thickness measurement (THI) 220 mm < th < 260 mm Dth < 10 mm Wafer th1 th2 D (mm) Wafer th1 th2 D (mm) Atlas Pixel Italia Apr 2004
I-V on diode w/ guard ring (IVD) Vbd = max V(I < 25 nA) Iop = I(Vop) Wafer Vbd (V) Iop(nA) Wafer Vbd (V) Iop(nA) Atlas Pixel Italia Apr 2004
C-V on diode w/ guard ring (CVD) (1/2) Measurement very noisy. One cable found defective. Large incertitude on Vdep. Vdep Cdep Vop r Wafer (V) (pF) (V) (W cm) Vop = max(150 V, Vdep + 50 V) Vdep = V(kink in C-V curve) Cdep = C(Vdep) 30 < Vdep (V) < 120 2000 < r (W cm) < 5000 Atlas Pixel Italia Apr 2004
C-V on diode w/ guard ring (CVD) (2/2) Vdep Cdep Vop r Wafer (V) (pF) (V) (W cm) See next slide Vop = max(150 V, Vdep + 50 V) Vdep = V(kink in C-V curve) Cdep = C(Vdep) 30 < Vdep (V) < 120 2000 < r (W cm) < 5000 Atlas Pixel Italia Apr 2004
I-V on tiles (1/2) Wafer Vop (V) Vbd (V) S goodtiles Vbd > Vop S = I(Vop) / I(Vop-50) < 2 Atlas Pixel Italia Apr 2004
I-V on tiles (2/2) Wafer Vop (V) Vbd (V) S goodtiles Bad I-t Vbd > Vop S = I(Vop) / I(Vop-50) < 2 Atlas Pixel Italia Apr 2004
I-V on SC’s Only half of the SC’s are being measured Wafer good/total Wafer good/total Vbd > Vop S = I(Vop) / I(Vop-50) < 2 Atlas Pixel Italia Apr 2004
I-V on MC’s Only half of the MC’s are being measured Wafer good/total Wafer good/total Vbd > Vop S = I(Vop) / I(Vop-50) < 2 Atlas Pixel Italia Apr 2004
I-t on good tiles (ITS) S = Iend / Istart < 1.3 Wafer-tileS Atlas Pixel Italia Apr 2004
delay = 4 s I-V on MOS (BOX) Wafer Vbd (V) Wafer Vbd (V) Vbd = max V(I < 100 pA) > 50 V Atlas Pixel Italia Apr 2004
C-V on MOS (COX) Wafer Cox (pF) Cmin (pF)CFB (pF) VFB (V) Cox = Cmax VFB = V(C nearest to CFB) Atlas Pixel Italia Apr 2004
I-V on gate-controlled diode (IVG) Wafer Itop (pA) Ibot (pA) Iox(pA) Itop = I(VFB +3 V) Ibot = I(VFB – 3 V) Atlas Pixel Italia Apr 2004
COX, IVG discrepancy VFB is around 16 V VFB is around 4 V
I-Vg on MOSFET (MFE) Wafer Vth (V) p-dose (x 1012 cm-2) Vth is usually good, but I beyond threshold is very low. See next slide. Vth = max V(I < 100 nA) > 0 2.2 < p (1012 cm-2) < 3.5 Atlas Pixel Italia Apr 2004
Vpix-V on punch-thru structure (PUT) Vpt >3 V Wafer Vpt (V) Wafer Vpt (V) Atlas Pixel Italia Apr 2004
Conclusions • 11 wafers are being measured • Missing measurements: VIS, PLA • Some measurements need to be done again • Wafer quality : • bad passivation in the mask alignment monitor for all 4th vernier pair, wafers 9688-07, 1203-34 • Many scratches on the tiles of 9688-07 • Bad bump pads for 9688-10 (and 9688-07) • wafer 1203-34 does not pass MFE test • wafer 1203-34, 9688-10 have only one good tile • wafer 1203-27 has no good tile • Almost all wafers do not pass PUT test Atlas Pixel Italia Apr 2004
Conclusions Atlas Pixel Italia Apr 2004
Project Progress Tracking • Dortmund 145/250 58% • New Mexico 0/250 0% • Prague 250/250 100% • Udine 212/250 84% • This tool is not trustable. Laboratory tiles meas/total percent Atlas Pixel Italia Apr 2004
Tile pool • In reality the 4 labs have received a total of 1121 tiles, 1060 of which have been accepted: • Dortmund: 250 • NM: 265 • Prague: 250 • Udine: 212 • The missing tiles are to be finished measuring by Udine (14 wafers) and Dortmund. Atlas Pixel Italia Apr 2004