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20 August 2020 Long time operation in TlBr X-ray imager using bipolar-input ROIC
Katsuyuki Takagi, Toru Aoki, Keitaro Hitomi, Tsuyoshi Terao, Hiroki Kase, Akifumi Koike
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Proceedings Volume 11494, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXII; 114940Y (2020) https://doi.org/10.1117/12.2570543
Event: SPIE Optical Engineering + Applications, 2020, Online Only
Abstract
We already reported TlBr X-ray imager by using our original designed ROIC “photon and charge counting type ROIC”. The silver bumps were used in this imager device for connecting TlBr and ROIC, and this silver bumps were also behaved as silver electrode on TlBr. It is difficult to operate TlBr radiation detector for long time, and Hitomi et.al. reported that the long-time operation could achieved by switching the bias voltage polar for the detector and/or using thallium (Tl) electrode. In our TlBr imager, we designed the ROIC input circuit using bipolar amplifier. In this paper, we use bias polar switching method for long time operation of TlBr X-ray imager, because it is not easy to adapted photo-lithography process of Tl metal for making pixelized TlBr sensor. We use the silver electrode (as also bumping material), and the device structure was TlPb(common electrode)/TlBr/Ag(pixel electrodes and bump material)/ROIC. We will discuss about long time operations in this imager.
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Katsuyuki Takagi, Toru Aoki, Keitaro Hitomi, Tsuyoshi Terao, Hiroki Kase, and Akifumi Koike "Long time operation in TlBr X-ray imager using bipolar-input ROIC", Proc. SPIE 11494, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXII, 114940Y (20 August 2020); https://doi.org/10.1117/12.2570543
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KEYWORDS
Readout integrated circuits
X-ray imaging
Electrodes
Silver
Imaging systems
Sensors
Thallium
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