Materials development for auxiliary components for large compact Mo/Au TES arrays

James A. Chervenak, F. M. Finkbeiner, S. R. Bandler, R. Brekosky, A. D. Brown, Naoko Iyomoto, R. L. Kelley, C. A. Kilbourne, F. S. Porter, J. Sadleir, S. Smith

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Pursuing the feasibility of scaling conventionally-micromachined transition-edge-sensor (TES) arrays, we have undertaken a study of materials suitable for array integration. A potential limitation of increased pixel count is adequate heatsinking of each detector element to its base temperature. We describe technical approaches for heat sinking large compact TES microcalorimeter arrays and calculate the achievable heatsinking based on measured material parameters. Techniques include backside-deposited thick film copper on arrays with deep-etched wells in the substrates and electroplated gold and copper-filled micro-trenches on the substrate surface. Another limitation is the sensitivity of the thin film circuit elements to applied stress, which can arise in fabrication and mounting of arrays of increasing size. We have explored stress and deposition temperature sensitivity in our molybdenum-based bilayers. Such process parameters can impact options for array heat sinking and electrical interconnects.

Original languageEnglish
Pages (from-to)255-260
Number of pages6
JournalJournal of Low Temperature Physics
Volume151
Issue number1-2 PART 1
DOIs
Publication statusPublished - Apr 1 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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