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Title: A Silicon-on-Insulator-Based Dual-Gain Charge-Sensitive Pixel Detector for Low-Noise X-ray Imaging for Future Astronomical Satellite Missions
Authors: Shrestha, Sumeet
Kawahito, Shoji
Kamehama, Hiroki
Nakanishi, Syunta
Yasutomi, Keita
Kagawa, Keiichiro
Teranishi, Nobukazu
Takeda, Ayaki
Tsuru, Takeshi
Kurachi, Ikuo
Arai, Yasuo
Author's alias: 鶴, 剛
Keywords: active pixel sensor
charge sensitive amplifier
dual gain
high energy astrophysics
SOI pixel
spectroscopic performance
X-ray detector
Issue Date: 1-Jun-2018
Publisher: MDPI AG
Journal title: Sensors
Volume: 18
Issue: 6
Thesis number: 1789
Abstract: In this paper, we report on the development of a monolithic active pixel sensor for X-ray imaging using 0.2 µm fully depleted silicon-on-insulator (SOI)-based technology to support next generation astronomical satellite missions. Detail regarding low-noise dual-gain SOI based pixels with a charge sensitive amplifier and pinned depleted diode sensor structure is presented. The proposed multi-well sensor structure underneath the fully-depleted SOI allows the design of a detector with low node capacitance and high charge collection efficiency. Configurations for achieving very high charge-to-voltage conversion gain of 52 µV/e⁻ and 187 µV/e⁻ are demonstrated. Furthermore, in-pixel dual gain selection is used for low-noise and wide dynamic range X-ray energy detection. A technique to improve the noise performance by removing correlated system noise leads to an improvement in the spectroscopic performance of the measured X-ray energy. Taken together, the implemented chip has low dark current (44.8 pA/cm² at −30 °C), improved noise performance (8.5 e⁻ rms for high gain and 11.7 e⁻ rms for low gain), and better energy resolution of 2.89% (171 eV FWHM) at 5.9 keV using ⁵⁵Fe and 1.67% (234 eV FWHM) at 13.95 keV using ²⁴¹Am.
Rights: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0)
DOI(Published Version): 10.3390/s18061789
PubMed ID: 29865217
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