R&D of Low Gain Avalanche Diode (LGAD) with large area

Low Gain Avalanche Diode (LGAD) has high-precision time performance, and the time resolution can reach 30 ps. The LGAD with a size of 1.3 mm×1.3 mm was used for the High Granularity Timing Detector (HGTD) in the upgrade of ATLAS and CMS on High-Luminosity Large Hadron Collider (HL-LHC). Compared with the HL-LHC, the future electron-positron collider (such as ILC, CEPC, FCC-ee and STCF) will have fewer charged particles in the final states. Large area LGAD will save electronics channels. This presentation will show the test results of the large area LGAD sensors, including beta source test, picosecond laser test, collected charge, signal-to-noise ratio, time resolution, etc.