Radiation-resistant thin LGADs for enhanced 4D tracking

This contribution presents the results of an R&D study on the EXFLU1 batch, a novel concept of thin Low Gain Avalanche Diodes (LGADs) designed to achieve improved timing resolution and radiation tolerance up to 25 × 10¹⁴ n${}_{\text{eq}}$cm⁻². Sensors with different thicknesses (15, 20, 30, and $45\mu m$) have been explored. New designs for the gain layer and guard ring structure have been investigated, along with two different doping activation methods. The sensors have been irradiated up to 25 × 10¹⁴ n${}_{\text{eq}}$cm⁻² and characterised in terms of current, capacitance, and gain to assess their radiation tolerance. Finally, $30\mu m$ LGADs were tested in a 4 GeV electron beam to evaluate their timing resolution.