23.01.2002 IEKP - Universität Karlsruhe (TH) 1 Preliminary Pinhole Studies (not final) F. Hartmann IEKP - Universität Karlsruhe (TH) Creation of defined.

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IEKP - Universität Karlsruhe (TH)

Presentation transcript:

IEKP - Universität Karlsruhe (TH) 1 Preliminary Pinhole Studies (not final) F. Hartmann IEKP - Universität Karlsruhe (TH) Creation of defined number of pinholes per chip Increase of leakage current according to LHC years also defines the voltage over the dielectric (with Rpoly= 1.8MOhm) o Effect of pinholes on readout o Gain vs. number of pinholes?? o Gain vs. leakage current (= years of LHC operation) Conclusion

IEKP - Universität Karlsruhe (TH) 2 Power Consumption 60  A/cm 3  I leak (-10°C)= 270  A (W6b)  540µA (module)  P(500V, -10°C)=135mW/sensor P ~ U FD I ~ d 2 d ~d 3

IEKP - Universität Karlsruhe (TH) 3 Setup P+ Al SiO2 DC AC bond Ichannel=Itot / #channel=Itot/1024 Vdrop=Istrip*Rpoly = Istrip*1.8MOhm  300µA/1024 *1.8MOhm= 0.5V  30µA=0.05V ... Array of IR LED for cont. illumination  increase in total current with standard reverse bias. Bonding artificial pinholes on purpose!

IEKP - Universität Karlsruhe (TH) 4 Noise vs. leakage current Vb=500V; Il=0.3µA Vb=500V; Il=30µA Vb=500V; Il=300µA Pinholes highly leakage current dependent Very difficult to tag at starting current level

IEKP - Universität Karlsruhe (TH) 5 Vb=500V; Il0.3µA Vb=500V; Il 120µA Vb=500V; Il 30µA Vb=500V; Il 300µA Pedestals vs. leakage current NO change

IEKP - Universität Karlsruhe (TH) 6 Gain vs. leakage current (calibration) (Vbias=500V) (5&6 pinholes) Il 0,3µA  ph 330 Il 90µA  ph 260Il 60µA  ph 280 Il 30µA (Vdrop=0.05V)  ph 300 Preliminary p p p p pp

IEKP - Universität Karlsruhe (TH) 7 Gain vs. leakage current (calibration) (Vbias=500V) (5&6 pinholes) Il 150µA  ph 255 Il 240µA  ph 255 Il 300µA (0.5V)  ph 255 Preliminary No change in gain at leakage currents above 150µA (up to 300µA) ??

IEKP - Universität Karlsruhe (TH) 8 Calibration/Gain No pinholes 4 pinholes 3 pinholes p p Vbias=500V; Il 60µA (Vdrop=0.1V)

IEKP - Universität Karlsruhe (TH) 9 Common mode 0 pinholes 10 pinholes Vbias = 400V Il = 200µA

IEKP - Universität Karlsruhe (TH) 10 Conclusion We bonded up to 10 pinholes per chip and imposed a current of 300µA/modules (330nA/channel; Vdrop = 0.5V) ~ 5 years of LHC operaton. No saturation of chip seen; but final current level not yet reached. Only 300µA instead of µA Gain loss and change in common mode with increasing leakage current and number of pinholes Pinholes easy to tag with high current.

IEKP - Universität Karlsruhe (TH) 11 IV-Curve before/after Irrad.

IEKP - Universität Karlsruhe (TH) 12