Evaluation of the Radiation Tolerance of SiGe Heterojunction Bipolar Transistors Under Gamma Exposure J. Metcalfe, D.E. Dorfan, A. A. Grillo, A. Jones,

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Evaluation of the Radiation Tolerance of SiGe Heterojunction Bipolar Transistors Under Gamma Exposure J. Metcalfe, D.E. Dorfan, A. A. Grillo, A. Jones, F. Martinez-McKinney, P. Mekhedjian, M. Mendoza, H. F.-W. Sadrozinski, G. Saffier-Ewing, A. Seiden, E. Spencer, M. Wilder SCIPP, University of California Santa Cruz, 95064, USA R. Hackenburg, J. Kierstead, S. Rescia Brookhaven National Laboratory, NY , USA J. D. Cressler, G. Prakash, A. Sutton Georgia Tech, Atlanta, GA , USA SCIPP Santa Cruz Institute for Particle Physics

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 2 SCIPP Power Constraints ATLAS already has over 4,000 heavy copper cables for the SCT alone! -> Need to reduce power consumption w/out sacrificing noise performance at high radiation levels for ATLAS Upgrade if we want to replace the TRT with silicon. Target for Front-End Channel (Analog Section Only):Current ATLAS: <400  15pF (long strips at outer radius, 60cm)2 mW <160  6pF (short strips at mid-radius, 20 cm)

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 3 SCIPP Why SiGe? Advantages of SiGe Bipolar Over CMOS for Silicon Strip Detectors A key element in the design of low noise, fast shaping, charge amplifiers is high transconductance in the first stage. With CMOS technologies, this requires relatively larger bias currents than with bipolar technologies. The changes that make SiGe Bipolar technology operate at 100 GHz for the wireless industry coincide with the features that enhance performance in high energy particle physics applications. Small feature size increases radiation tolerance. Extremely small base resistance (of order  ) affords low noise designs at very low bias currents. These design features are important for applications with: Large capacitive loads (e.g pF silicon strip detectors) Fast shaping times (e.g. accelerator experiments with beam crossing times of tens of nanoseconds in order to identify individual beam crossing events)

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 4 SCIPP SiGe Technology Origin of radiation tolerance: Small active volume of the transistor Thin emitter-base spacer oxide (weakest spot) SiGe Technology Readily Available Over 25 foundries Some Vendors: IBM, IHP, JAZZ, Motorola, STm… IBM offers 3 generations (4th on the way): 5HP (5AM): 0.5x1 -> 0.5x20  m 2 7HP: 0.2x1 -> 0.28x20  m 2 8HP: 0.12x0.52 -> 0.12x8  m 2 IHP SiGe Technology: Radiation Tolerance Study by: Miguel Ullán, et al CNM, Barcelona Ned Spencer (SCIPP) has designed an amplifier with IHP as a proof of principle

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 5 SCIPP Summary of 2004 Proton Results Irradiation Procedure: 5AM devices were sent to CERN and exposed to a 24GeV proton source with the highest fluence taking 5 days to accumulate. The leads were grounded during irradiation -- > worst case scenario. The transistors were annealed to improve performance. Special thanks to the RD50 collaboration, especially, Michael Moll and Maurice Glaser!! Device Sizes: 0.5x1  m 2 0.5x2.5  m 2 0.5x10  m 2 0.5x20  m 2 4x5  m 2 Pre-rad 1.15 x x x x x x ATLAS Upgrade Outer Radius Mid Radius Inner Radius

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 6 SCIPP Summary of 2004 Proton Results Current Gain,  Current Gain, , vs. I c for 0.5x10  m 2 Pre-rad and for All Fluences Including Full Annealing I c [A] Before Irradiation Highest Fluence Lowest Fluence Increasing Fluence Current Gain,  3x10 14, I c low enough for substantial power savings over 15, I c good for a front transistor (uses a higher current while minimizing noise)

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 7 SCIPP Current Investigation Tests: 8HP HBT 8HP HBT--Biased For gammas & protons 8HP HBT--Shield For gammas & neutrons 7HP HBT 5AM HBT 8HP Resistor 8HP Capacitor Measurements: Forward Gummel Vcb=0V, 0.5V Inverse Gummel Vcb=0V, 0.5V Early Voltage Neutral Base Recombination M-1, Avalanche Factor Resistance Capacitance Runs: Characterization (Pre-Rad) Post-Rad (No Anneal) Anneal 1 (5 25C) Anneal 2 (1 60C) Anneal 3 (1 100C) Anneal 4 (6 100C) Over 22,000 measurements planned!!! Developed an automatic measuring system at SCIPP and BNL ->Plug in a chip, take all measurements for all transistors at once Will this be enough to understand the specific mechanisms for device degradation?? Gamma, Neutron & Proton Irradiations:

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 8 SCIPP Current Investigation Characterization measurements: Irrad Procedure for Gammas: 60 Co source at BNL Measurements performed at BNL Total dose of 100 Mrads Devices tested at steps: 500 kRad 1 Mrad 5 Mrad 10 Mrad 50 Mrad 100 Mrad Devices shorted during irrad Except one 8HP HBT chip biased No Shield* (next round)

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 9 SCIPP Preliminary Gamma Results The damage caused by gammas and protons for comparable doses/fluences is very similar even though starting gain values are different. This may imply that most of the gain degradation is induced by ionization damage.

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 10 SCIPP Preliminary Gamma Results 8HP has the best overall performance. The damage mechanism in the 7HP is distinctly different due to structural differences. “ Ionizing radiation has been shown to damage the EB spacer region in these SiGe HBTs, and produce a perimeter-dependent space-charge generation/recombination (G/R) base-current leakage component that progressively degrades the base current (and current gain) as the fluence increases. …the 7HP device degrades much more rapidly than the 5HP device. This result is consistent with significantly higher EB electric field under the EB spacer region in the 7HP device, which has both more abrupt doping profiles…as well as a decreased EB spacer thickness compared to the 5HP device…”Silicon-Germanium Heterojunction Bipolar Transistors, Cressler, Niu

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 11 SCIPP Preliminary Gamma Results The gain for the biased transistor started at a lower gain value (normal fluctuation in starting gain), but by 5 MRads showed less radiation damage. At higher doses this effect becomes enhanced indicating that device performance at high doses for transistors shorted during irradiation will be improved. The gain of the shorted 8HP HBT degrades more rapidly after 100 MRads. The gain of the biased 8HP HBT performs much better after 100 MRads, even though it started at a lower gain value!!

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 12 SCIPP Preliminary Gamma Results: Biased Transistor performance at for 8HP at 100 Mrad is very good--the current gain is still 77 at 1  A!! (No annealing yet!) Before Irradiation Highest Dose, 100 MRad Lowest Dose, 500 kRad Biased during irradiation

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 13 SCIPP Preliminary Gamma Results Universal behavior is independent of transistor geometry when compared at the same current density J c and for similarly shorted or biased transistors. For a given current density  (1/  ) scales linearly with the log of the fluence. This precise relation allows the gain after irradiation to be predicted for other SiGe HBTs for shorted devices before annealing. Hence, the operating currents can be scaled to desired device sizes for Front-End Channel simulations.

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 14 SCIPP Preliminary Gamma Results Requires only 0.28  A to reach a gain of 50!! At 100 Mrad (before annealing!), the dose reached at the mid-region of ATLAS Upgrade, very small currents can be used in the design of the front transistor and the others in a Front-End Channel design. This provides flexibility in choosing the operating current for the transistor, which allows the FEC design to optimize other factors such as matching. Qualifications for a good transistor: A gain of 50 is a good figure of merit for a transistor to use in a front-end circuit design.

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 15 SCIPP Preliminary Power Savings SPICE simulations with IHP models predicts these currents yield a Front- End Channel design using only 360  W!! Current ATLAS uses 2 mW! *CMOS numbers courtesy of Kaplon FEE Design 360  W/Channel Pre-Amp Amplifier-ShaperComparator Total 0.25  m 300  A 210  A 120  A 1.5 mW CMOS (120  A )*(1.1 mW)* SiGe 150  A 13  A 16.6  A 0.36 mW IHP (40  A )*(0.14 mW)* * Low capacitance (7 pF) = Short strip

6/26/2006Rad Tolerance of SiGe HBT Jessica Metcalfe 16 SCIPP Conclusions Radiation damage may be primarily due to ionization damage. 8HP appears to be more Rad Tolerant than 5AM or 7HP. HBTs biased during irradiation (closer to actual conditions in ATLAS) show less damage--interesting to see after annealing. Preliminary results of gamma irradiations indicate that IBM 8HP SiGe Technology is sufficiently Rad Tolerant for ATLAS Upgrade SCT application. (Irradiations already underway will verify this.) May be able to reduce power by 75% from 1500  W to 360  W!