Fabrication of Bismuth Absorber Arrays for NTD-Ge Hard X-ray Microcalorimeters

Ugo Lo Cicero, Andrea Zaffora, Luigi Botta, Monica Santamaria, Daniele Gulli, Marco Barbera, Salvatore Ferruggia Bonura, Francesco Di Franco, Lo Cicero, Salvatore Ferruggia Bonura, Daniele Gulli, Varisco, Collura, Barbera, Spoto

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1 Citation (Scopus)


The high-spectral-resolution detection of hard X-rays (E > 20 keV) is a challenging and nearly unexplored area in space astrophysics. Traditionally hard X-ray detectors present moderate spectral resolutions, although few tens of eV one could open new frontiers in the study of nuclear processes and high-temperature plasma dynamics in energetic processes. This can be achieved by using cryogenic microcalorimeters. Within a research activity aimed at developing arrays of neutron transmutation-doped germanium (NTD-Ge) microcalorimeters for the high-spectral-resolution detection (about 50 eV@60 keV) of hard X-rays (20 keV < E<100 keV), we developed an electroplating process to fabricate high-thickness (> 60 μm) bismuth absorber arrays. The adopted technological process and the study of related process parameters are discussed; preliminary results on produced arrays are given.
Original languageEnglish
Pages (from-to)336-341
Number of pages6
JournalJournal of Low Temperature Physics
Publication statusPublished - 2020

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics


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