The effects in fabrication and performance of carbon doping on IMB-CNM manufactured LGADs

Over the past few years, Low Gain Avalanche Detectors (LGAD) have shown excellent timing performance with the hope to be utilized for 4D-tracking of high-energy charged particles. LGADs co-doping with carbon has been demonstrated to be a key factor in the enhancement of their performance as detectors with intrinsic amplification in harsh radiation environments. A wide characterization, before irradiation, of the latest carbonated LGADs fabricated at the IMB-CNM is presented in this work. The results show that the addition of carbon improves the gain of the devices, given a specific bias voltage, but only up to a certain point. Moreover, a comprehensive study of how carbonation enhances the diffusion suppression of dopants in silicon sensors during its fabrication is also presented.