Investigation of the Kyoto's X-ray Astronomical SOIPIXs with Double-SOI Wafer for Reduction of Cross-talks
Investigation of the Kyoto's X-ray Astronomical SOIPIXs with Double-SOI Wafer for Reduction of Cross-talks
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发表时间：
2015-08
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通讯作者：
S. Ohmura;T. Tsuru;Takaaki Tanaka;A. Takeda;Hideaki Matsumura;Itoh Makoto;S. Nakashima;Y. Arai;K. Mori;R. Takenaka;Y. Nishioka;T. Kohmura;Kouki Tamasawa
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作者：
S. Ohmura;T. Tsuru;Takaaki Tanaka;A. Takeda;Hideaki Matsumura;Itoh Makoto;S. Nakashima;Y. Arai;K. Mori;R. Takenaka;Y. Nishioka;T. Kohmura;Kouki Tamasawa
我们一直在为未来的X射线天文卫星研制X射线SOIPIX，“XRPIX”。XRPIX配备了“事件驱动读出”功能，该功能允许我们仅读出信号命中像素，并实现了高时间分辨率（$\sim 10\mu {\rm s}$）。当前版本的XRPIX存在的问题是，事件驱动读出模式中的读出噪声高于帧读出模式中的读出噪声，在帧读出模式中，所有像素被串行读出。先前的研究已经阐明，该问题是由传感器层中的掩埋P阱（BPW）和电路层中的像素内电路之间的串扰引起的。因此，我们开发了具有双SOI晶片（DSOI）的新XRPIX，其具有额外的硅层（中间硅），其用作BPW和像素内电路之间的电屏蔽。在调整施加到中间硅的电压之后，我们通过观察像素电路的模拟波形来确认串扰的减少。我们还成功地用XRPIX探测到了$^{241}$Am X射线。
We have been developing X-ray SOIPIXs, "XRPIX", for future X-ray astronomy satellites. XRPIX is equipped with a function of "event-driven readout", which allows us to readout signal hit pixels only and realizes a high time resolution ($\sim10\mu{\rm s}$). The current version of XRPIX suffers a problem that the readout noise in the event-driven readout mode is higher than that in the the frame readout mode, in which all the pixels are read out serially. Previous studies have clarified that the problem is caused by the cross-talks between buried P-wells (BPW) in the sensor layer and in-pixel circuits in the circuit layer. Thus, we developed new XRPIX having a Double SOI wafer (DSOI), which has an additional silicon layer (middle silicon) working as an electrical shield between the BPW and the in-pixel circuits. After adjusting the voltage applied to the middle silicon, we confirmed the reduction of the cross-talk by observing the analog waveform of the pixel circuit. We also successfully detected $^{241}$Am X-rays with XRPIX.