Fabrication and performance of AC-coupled LGADs

Abstract

Detectors that can simultaneously provide fine time and spatial resolution have attracted wide-spread interest for applications in several fields such as high-energy and nuclear physics as well as in low-energy electron detection, photon science, photonics and imaging. Low-Gain Avalanche Diodes (LGADs), being fabricated on thin silicon substrates and featuring a charge gain of up to 100, exhibit excellent timing performance. Since pads much larger than the substrate thickness are necessary to achieve a spatially uniform multiplication, a fine pad pixelation is difficult. To overcome this limitation, the AC-coupled LGAD approach was introduced. In this type of device, metal electrodes are placed over an insulator at a fine pitch, and signals are capacitively induced on these electrodes. At Brookhaven National Laboratory, we have designed and fabricated prototypes of AC-coupled LGAD sensors. The performance of small test structures with different particle beams from radioactive sources are shown.

arXiv comment12 pages, 10 figures

References in corpus (4)

• Beam test results of a 16 ps timing system based on ultra-fast silicon detectors
• Recent Technological Developments on LGAD and iLGAD Detectors for Tracking and Timing Applications
• Development of a technology for the fabrication of Low-Gain Avalanche Detectors at BNL
• Design and Fabrication of an Optimum Peripheral Region for Low Gain Avalanche Detectors

Cited by in corpus (12)

• Resistive AC-Coupled Silicon Detectors: principles of operation and first results from a combined analysis of beam test and laser data
• First demonstration of 200, 100, and 50 um pitch Resistive AC-Coupled Silicon Detectors (RSD) with 100% fill-factor for 4D particle tracking
• Silicon Sensors for Future Particle Trackers
• Measurements of an AC-LGAD strip sensor with a 120 GeV proton beam
• First survey of centimeter-scale AC-LGAD strip sensors with a 120 GeV proton beam
• The performance of large-pitch AC-LGAD with different N+ dose
• Signal formation and sharing in AC-LGADs using the ALTIROC 0 front-end chip
• Latest vertex and tracking detector developments for the future Electron-Ion Collider
• Fast timing silicon R$\&$D for the future Electron-Ion Collider
• Characterization of BNL and HPK AC-LGAD sensors with a 120 GeV proton beam
• Gain characterization of LGAD sensors with beta particles and 28-MeV protons
• AC-LGADs Fermilab Front-End Electronics Characterization