Yang Tao (IHEP): "Development of Ultra-fast Silicon and Silicon Carbide Detectors"

Friday 18 Nov 2022, 13:00 → 14:00 US/Pacific

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Topic: Brown bag seminar

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https://lbnl.zoom.us/j/94752359163

 

Abstract: Promoted by the future particle colliders and nuclear reactors while detectors are operating in harsh radiation environment, developing ultra-fast detector with excellent radiation hardness is a challenge. Low Gain Avalanche Detector (LGAD) has excellent time performance because of its good S/N in the low gain range (10-100). The IHEP-IME series and NDL series Silicon LGAD have been developed successfully in the past few years for the ATLAS HGTD project. However, when the irradiation flux increases to 2.5× 10^15 neq/cm2, the collected charges of Silicon LGAD will decrease significantly. Moreover, the Silicon LGAD must be cooled to -30 °C to compensate for the rapidly increasing leakage current under extreme irradiation conditions. Inspired by the Silicon LGAD, the possibilities to produce similar device using 4H-SiC are investigated, benefiting from the intrinsic characteristics of the wide band gap properties of Silicon Carbide, such as higher saturated carrier velocity, higher atom displacement energy as well as the recent technological improvement of high-quality epitaxy with high resistance from industry. Followed by the study of the timing performance of the 4H-SiC PIN device, the 4H-SiC LGAD prototype has been fabricated, and the preliminary test results are presented.