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arXiv 1701.05033physics.ins-det
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耗尽CMOS像素探测器原型的中子辐照试验

Neutron irradiation test of depleted CMOS pixel detector prototypes

Igor Mandić, Vladimir Cindro, Andrej Gorišek, Bojan Hiti, Gregor Kramberger, Marko Mikuž, Marko Zavrtanik, Tomasz Hemperek, Michael Daas, Fabian Hügging, Hans K… 展开作者

Igor Mandić, Vladimir Cindro, Andrej Gorišek, Bojan Hiti, Gregor Kramberger, Marko Mikuž, Marko Zavrtanik, Tomasz Hemperek, Michael Daas, Fabian Hügging, Hans Krügerc, David-Leon Pohl, Norbert Wermes, Laura Gonella

摘要:

采用Edge-TCT方法研究了在初始电阻率为2 k $Ω$ cm的p型衬底上(LFoundry 150 nm工艺)制作的耗尽型CMOS像素探测器原型在中子辐照前后的电荷收集特性。该测试结构是为HL-LHC升级实验中CMOS工艺跟踪探测器的研究而设计的。测量与被动探测器结构,其中电流脉冲上引起的电荷收集电极可以直接观察到。估算并研究了中子辐照注量对贫化层厚度的影响。在前两个照射步骤后观察到耗尽厚度增加至1 $\cdot$ 10 $^{13}$ n/cm $^{2}$和5 $\cdot$ 10 $^{13}$ n/cm $^{2}$,并归因于初始受体去除。在较高的注量下,由于辐照诱导的缺陷对有效空间电荷浓度有贡献,在给定电压下的耗尽层厚度随注量的增加而减小。该行为与用于标准粒子探测器的高电阻率硅的行为一致。在用1 $\cdot$ × 10 $^{15}$ n/cm $^{2}$照射后,在100 V偏压下测量的耗尽层的厚度大于50 $μ$ m。这足以保证HL-LHC实验中像素跟踪器外层的满意信号/噪声性能。

英文摘要:

Charge collection properties of depleted CMOS pixel detector prototypes produced on p-type substrate of 2 k$Ω$cm initial resistivity (by LFoundry 150 nm process) were studied using Edge-TCT method before and after neutron irradiation. The test structures were produced for investigation of CMOS technology in tracking detectors for experiments at HL-LHC upgrade. Measurements were made with passive detector structures in which current pulses induced on charge collecting electrodes could be directly observed. Thickness of depleted layer was estimated and studied as function of neutron irradiation fluence. An increase of depletion thickness was observed after first two irradiation steps to 1$\cdot$10$^{13}$ n/cm$^{2}$ and 5$\cdot$10$^{13}$ n/cm$^{2}$ and attributed to initial acceptor removal. At higher fluences the depletion thickness at given voltage decreases with increasing fluence because of radiation induced defects contributing to the effective space charge concentration. The behaviour is consistent with that of high resistivity silicon used for standard particle detectors. The measured thickness of the depleted layer after irradiation with 1$\cdot$10$^{15}$ n/cm$^{2}$ is more than 50 $μ$m at 100 V bias. This is sufficient to guarantee satisfactory signal/noise performance on outer layers of pixel trackers in HL-LHC experiments.

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