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Excess Heat Capacity in Mo/Au Transition Edge Sensor Bolometric Detectors.

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IEEE Transactions on Applied Superconductivity : a Publication of the IEEE Superconductivity Committee
|May 10, 2021
PubMed
Summary
This summary is machine-generated.

Excess heat capacity in Mo/Au bilayer transition edge sensor (TES) detectors caused anomalous thermal response. Laser ablation and material analysis revealed molybdenum silicides as the cause, improving detector performance.

Keywords:
Microfabricationsuperconducting photodetectorssurface contaminationthin film sensors

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Area of Science:

  • Astrophysics
  • Materials Science
  • Detector Physics

Background:

  • Transition Edge Sensors (TES) are crucial bolometric detectors for high-resolution spectroscopy.
  • Mo/Au bilayer TES detectors for the HIRMES instrument showed unexpected, slow thermal response times.
  • This anomalous behavior was linked to excess heat capacity beyond bulk material properties.

Purpose of the Study:

  • Investigate the origin of the secondary, slow thermalization time constant in Mo/Au bilayer TES detectors.
  • Determine the cause of the excess heat capacity affecting detector response.
  • Optimize TES detector performance by mitigating the anomalous time constant.

Main Methods:

  • Fabrication and characterization of Mo/Au bilayer TES detectors for HIRMES.
  • Utilized laser ablation to modify silicon membranes and analyze its effect on detector response.
  • Employed glancing incidence x-ray diffraction (GIXRD) to identify material phases.
  • Quantified molybdenum concentration using secondary ion mass spectroscopy (SIMS).

Main Results:

  • Mo/Au bilayer TES detectors exhibited two distinct thermal response timescales.
  • Laser ablation of silicon membranes reduced the contribution of the secondary, slower time constant.
  • GIXRD revealed the presence of molybdenum silicides at the silicon interface.
  • SIMS analysis indicated excess molybdenum concentration, correlating with the observed excess heat capacity.

Conclusions:

  • The anomalous slow thermal response in Mo/Au bilayer TES detectors is attributed to the formation of molybdenum silicides.
  • Excess heat capacity from these silicides significantly impacts detector time constants.
  • Material processing and characterization are key to understanding and improving TES detector performance for applications like HIRMES.