Impact of neutron irradiation on LGADs with a carbon-enriched shallow multiplication layer: Degradation of timing performance and gain

IF 1.5 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-05-01 Epub Date: 2025-02-15 DOI:10.1016/j.nima.2025.170309

E. Navarrete Ramos , J. Duarte-Campderros , M. Fernández , G. Gómez , J. González , S. Hidalgo , R. Jaramillo , P. Martínez Ruiz del Árbol , M. Moll , C. Quintana , A.K. Sikdar , I. Vila , J. Villegas

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Abstract

In this radiation tolerance study, Low Gain Avalanche Detectors (LGADs) with a carbon-enriched broad and shallow multiplication layer were examined in comparison to identical non-carbonated LGADs. Manufactured at IMB-CNM, the sensors underwent neutron irradiation at the TRIGA reactor in Ljubljana, reaching a fluence of 1.5 × 10 ¹⁵n_eqcm⁻². The results revealed a smaller deactivation of boron and improved resistance to radiation in carbonated LGADs. The study demonstrated the potential benefits of carbon enrichment in mitigating radiation damage effects, particularly the acceptor removal mechanism, reducing the acceptor removal constant by more than a factor of two. Additionally, time resolution and collected charge degradation due to irradiation were observed, with carbonated samples exhibiting better radiation tolerance. A noise analysis focused on baseline noise and spurious pulses showed the presence of thermal-generated dark counts attributed to a too narrow distance between the gain layer end and the p-stop implant at the periphery of the pad for the characterized LGAD design; however, without significant impact of operation performance.

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中子辐照对富碳浅倍增层LGADs的影响：定时性能和增益的退化

在这项辐射耐受研究中，与相同的非碳化低增益雪崩探测器（LGADs）相比，研究了具有富碳宽和浅倍增层的低增益雪崩探测器（LGADs）。这些传感器由IMB-CNM制造，在卢布尔雅那的TRIGA反应堆进行中子辐照，辐照量达到1.5 × 10 15neqcm−2。结果显示，在碳化的lgad中，硼的失活较小，抗辐射能力提高。该研究证明了碳富集在减轻辐射损伤效应方面的潜在益处，特别是受体去除机制，将受体去除常数降低了两倍以上。此外，观察到时间分辨率和因辐照而收集的电荷降解，碳化样品表现出更好的辐射耐受性。对基线噪声和杂散脉冲的噪声分析表明，对于特征化LGAD设计，由于增益层端和外围p-stop植入物之间的距离过窄，存在热产生的暗计数；但对操作性能无明显影响。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.