Characterization of iLGADs using soft X-rays

Author:

Liguori Antonio,Barten Rebecca,Baruffaldi Filippo,Bergamaschi Anna,Borghi Giacomo,Boscardin Maurizio,Brückner Martin,Butcher Tim Alexander,Carulla Maria,Centis Vignali Matteo,Dinapoli Roberto,Ebner Simon,Ficorella Francesco,Fröjdh Erik,Greiffenberg Dominic,Hammad Ali Omar,Hasanaj Shqipe,Heymes Julian,Hinger Viktoria,King Thomas,Kozlowski Pawel,Lopez-Cuenca Carlos,Mezza Davide,Moustakas Konstantinos,Mozzanica Aldo,Paternoster Giovanni,Paton Kirsty A.,Ronchin Sabina,Ruder Christian,Schmitt Bernd,Thattil Dhanya,Xie Xiangyu,Zhang Jiaguo

Abstract

Abstract Experiments at synchrotron radiation sources and X-ray Free-Electron Lasers in the soft X-ray energy range (250 eV–2 keV) stand to benefit from the adaptation of the hybrid silicon detector technology for low energy photons. Inverse Low Gain Avalanche Diode (iLGAD) sensors provide an internal gain, enhancing the signal-to-noise ratio and allowing single photon detection below 1 keV using hybrid detectors. In addition, an optimization of the entrance window of these sensors enhances their quantum efficiency (QE). In this work, the QE and the gain of a batch of different iLGAD diodes with optimized entrance windows were characterized using soft X-rays at the Surface/Interface:Microscopy beamline of the Swiss Light Source synchrotron. Above 250 eV, the QE is larger than 55% for all sensor variations, while the charge collection efficiency is close to 100%. The average gain depends on the gain layer design of the iLGADs and increases with photon energy. A fitting procedure is introduced to extract the multiplication factor as a function of the absorption depth of X-ray photons inside the sensors. In particular, the multiplication factors for electron- and hole-triggered avalanches are estimated, corresponding to photon absorption beyond or before the gain layer, respectively.

Publisher

IOP Publishing

Subject

Mathematical Physics,Instrumentation

Cited by 4 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Design, fabrication, and preliminary test results of a new inverse-LGAD for soft X-ray detection;Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment;2024-08

2. Low gain avalanche diodes for photon science applications;Frontiers in Physics;2024-07-24

3. Resolving soft X-ray photons with a high-rate hybrid pixel detector;Frontiers in Physics;2024-02-28

4. Quantum Efficiency Measurement and Modeling of Silicon Sensors Optimized for Soft X-ray Detection;Sensors;2024-01-31

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