Spectroscopic performance of the electrical functional models for the eXTP SFA-T detectors

The Spectroscopy Focusing Array (SFA) is one of the three instruments on the eXTP satellite. It consists of six telescopes plus focal plane cameras, where five are equipped with a Silicon Drift Detector (SDD) array. These five SFA-T (T stands for timing) instruments are used for observations with high time resolution (better than 10 microseconds), high throughput (dead time less than 5 % when observing a 1 Crab source), and good energy resolution (better than 180 eV at 6 keV). This paper presents the spectroscopic performance of the Electrical Functional Modules (EFM) for SFA-T that are assembled and tested at the Max Planck Institute for Extraterrestrial Physics (MPE). A focus lies on the energy resolution at the planned sensor operating temperature of -45 {\deg}C. Additionally, the use of a baffle that covers the pixel edges is studied.