26.5 ps Time Resolution Using 50 μm Low Gain Avalanche Detectors Fabricated by Micron Semiconductor Ltd

Abstract: Low Gain Avalanche Detectors (LGADs) are silicon semiconductor sensors with an implanted thin p-doped multiplication layer that is designed to provide low gain. Most importantly, LGADs are specifically engineered to provide excellent spatial and temporal resolution simultaneously. The technology shows promising prospects of fulfilling the 4D tracking requirements of future high energy physics experiments. Micron Semiconductor Ltd. has fabricated LGADs with an active thickness of 50 $\mu$m. The electrical and timing performance has been measured and compared with devices fabricated at IMB-CNM for reference. 50 $\mu$m thin LGADs by Micron Semiconductor Ltd. were measured to have a timing resolution in the region of 30 ps using a dedicated setup involving minimum ionising particles produced by Sr-90. Specifically, the best timing resolution of 26.5 ps was measured at a bias voltage of 200 V at -30{\deg}C.