Development of Si (Li) Detectors for Charged Particles Spectrometer

Abstract

  Lithium drifted silicon (Si(Li)) detectors with high-quality large area for charged particles spectrometer aboard artificial satellite have been developed. Surface stability can be obtained by thin p-n junction fabricated with the applied photo engraving process (PEP) instead of surface barrier. The region compensated with Lithium can be improved by the adequate heat treatment, and this improvement can be monitored by means of a combination of copper plating and subsequent micro-XRF analysis. The detectors fabricated from the thermal treated wafers were found to have better energy resolution both for α-particles from ²⁴¹Am and conversion electrons from ²⁰⁷Bi.