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Full-Text Articles in Physical Sciences and Mathematics
Nonlinear Optimal Filter Technique For Analyzing Energy Depositions In Tes Sensors Driven Into Saturation, B. Shank, J. J. Yen, Blas Cabrera, J. M. Kreikebaum, R. Moffatt, P. Redl, Betty A. Young, P. L. Brink, M. Cherry, A. Tomada
Nonlinear Optimal Filter Technique For Analyzing Energy Depositions In Tes Sensors Driven Into Saturation, B. Shank, J. J. Yen, Blas Cabrera, J. M. Kreikebaum, R. Moffatt, P. Redl, Betty A. Young, P. L. Brink, M. Cherry, A. Tomada
Physics
We present a detailed thermal and electrical model of superconducting transition edge sensors (TESs) connected to quasiparticle (qp) traps, such as the W TESs connected to Al qp traps used for CDMS (Cryogenic Dark Matter Search) Ge and Si detectors. We show that this improved model, together with a straightforward time-domain optimal filter, can be used to analyze pulses well into the nonlinear saturation region and reconstruct absorbed energies with optimal energy resolution.
Measurement Of Quasiparticle Transport In Aluminum Films Using Tungsten Transition-Edge Sensors, J. J. Yen, B. Shank, Betty A. Young, Blas Cabrera, P. L. Brink, M. Cherry, J. M. Kreikebaum, R. Moffatt, P. Redl, A. Tomada, E. C. Tortorici
Measurement Of Quasiparticle Transport In Aluminum Films Using Tungsten Transition-Edge Sensors, J. J. Yen, B. Shank, Betty A. Young, Blas Cabrera, P. L. Brink, M. Cherry, J. M. Kreikebaum, R. Moffatt, P. Redl, A. Tomada, E. C. Tortorici
Physics
We report on experimental studies of phonon sensors which utilize quasiparticle diffusion in thin aluminum films connected to tungsten transition-edge-sensors (TESs) operated at 35 mK. We show that basic TES physics and a simple physical model of the overlap region between the W and Al films in our devices enables us to accurately reproduce the experimentally observed pulse shapes from x-rays absorbed in the Al films. We further estimate quasiparticle loss in Al films using a simple diffusion equation approach. These studies allow the design of phonon sensors with improved performance.
Resistance And Lifetime Measurements Of Polymer Solar Cells Using Glycerol Doped Poly[3,4-Ethylenedioxythiophene]: Poly[Styrenesulfonate] Hole Injection Layers, Bhaskar Mantha, Emma Lewis, Richard P. Barber Jr.
Resistance And Lifetime Measurements Of Polymer Solar Cells Using Glycerol Doped Poly[3,4-Ethylenedioxythiophene]: Poly[Styrenesulfonate] Hole Injection Layers, Bhaskar Mantha, Emma Lewis, Richard P. Barber Jr.
Physics
We have performed resistivity measurements of poly[3,4-ethylenedioxythiophene]: poly[styrenesulfonate] (PEDOT:PSS) films with varying concentrations of glycerol. Resistivity is seen to decrease exponentially from roughly 3 Ω-cm for pure PEDOT:PSS to 3 × 10-2Ω-cm for 35 mg/cm3 glycerol in PEDOT:PSS. Beyond this concentration adding glycerol does not significantly change resistivity. Bulk heterojunction polymer solar cells using these variously doped PEDOT:PSS layers as electrodes were studied to characterize the effects on efficiency and lifetime. Although our data display significant scatter, lowering the resistance of the PEDOT:PSS layers results in lower device resistance and higher efficiency as expected. We also note that the lifetime …