Mar 18 – 22, 2021
Stony Brook, NY
US/Eastern timezone

Novel Low Workfunction Semiconductors for Dark Matter, Neutrino Phenomena and x-ray Astronomy

Mar 18, 2021, 12:40 PM
Stony Brook, NY

Stony Brook, NY

Online [US/EST Timezone]
Low background / Low threshold detectors Low background / Low threshold detectors


David Winn (Fairfield University) Yasar Onel (University of Iowa)


In frontier physics, precision calorimetry from photons and charged and neutral massive particles have been crucial to major discoveries. Better resolution and low detection thresholds are of great interest for dark matter searches, solar and reactor neutrino detection and oscillations, neutrino mass measurements, x-ray astronomy, and double-beta decay. A Challenge for semiconductor detectors: E~10-100 eV. We discuss semiconductor photocathode materials Cs3Sb(S-11) and Ag-O-Cs(S-1)fabricated as possible bulk detectors both by thermal melts and ALD. The pair energy is a low as 0.7 eV for S-1, and the thermal noise for the S-11 is lower than Si despite a lower pair 2 eV compared to 3.6 eV because the bandgap is 1.6 eV, compared with 1.1 eV for Si. Mobilities for both are an order of magnitude larger than Si. ALD has the ability to make perfect crystals of these weakly bound semiconductors.

Primary authors

David Winn (Fairfield University) Yasar Onel (University of Iowa)

Presentation materials