Characterization of silicon microstrip sensors for space astronomy
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Characterization of silicon microstrip sensors for space astronomy Jia-Ju Wei1,2
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Jian-Hua Guo1,2
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Yi-Ming Hu1,2
Received: 1 July 2020 / Revised: 7 August 2020 / Accepted: 20 August 2020 / Published online: 7 October 2020 Ó China Science Publishing & Media Ltd. (Science Press), Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Chinese Nuclear Society and Springer Nature Singapore Pte Ltd. 2020
Abstract Silicon microstrip detectors are widely used in experiments for space astronomy. Before the detector is assembled, extensive characterization of the silicon microstrip sensors is indispensable and challenging. This work electrically evaluates a series of sensor parameters, including the depletion voltage, bias resistance, metal strip resistance, total leakage current, strip leakage current, coupling capacitance, and interstrip capacitance. Two methods are used to accurately measure the strip leakage current, and the test results match each other well. In measuring the coupling capacitance, we extract the correct value based on a SPICE model and two-port network analysis. In addition, the expression of the measured bias resistance is deduced based on the SPICE model. Keywords Silicon microstrip sensor Space astronomy Characterization SPICE model
This work was supported by the National Key R&D Program of China (No. 2016YFA0400204), the National Natural Science Foundation of China (Nos. 11873020, 11973097, and U1738210), and the Strategic Pioneer Program on Space Science of the Chinese Academy of Sciences (No. XDA15010200) & Jia-Ju Wei [email protected] 1
Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023, China
2
Key Laboratory of Dark Matter and Space Astronomy, Chinese Academy of Sciences, Nanjing 210023, China
1 Introduction C-ray detection is one of the most important observation methods in space astronomy. Recent studies showed that the high-energy c-ray’s spectrum and distribution can be used to explore the physical characteristics and distribution of the dark matter. By contrast, X-ray detection is also important in space astronomy. For example, hard X-ray solar observation can probe nonthermal electrons accelerated in the solar atmosphere. To accurately detect the c-ray and X-ray distributions, a tracker with a very high spatial resolution is needed. Although there are many candidates [1–4], the silicon microstrip detector [5–8] is one of the most suitable candidates because it has excellent spatial resolution (lower than 1.8 lm was mentioned in reference [9]). In addition, silicon microstrip detectors can extend the detection area by forming a cascade structure (i.e., the socalled ladder [10]) without adding extra readout electronics. This feature is very important for high-energy space astronomy detection, which needs a large detecting area but low power consumption. Silicon microstrip detectors are widely used in experiments for space astronomy, e.g., Payload for Antimatter Exploration and Light-nuclei Astrophysics (PAMELA) [11, 12], Light Imager f
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