Investigation of charge-collection efficiency of Kyoto's X-ray astronomical SQL pixel sensors, XRPIX

被引：8

作者：

Matsumura, Hideaki ^{[1
]}

Tsuru, Takeshi Go ^{[1
]}

Tanaka, Takaaki ^{[1
]}

Nakashima, Shinya ^{[1
]}

Ryu, Syukyo G. ^{[1
]}

Takeda, Ayaki ^{[2
]}

Arai, Yasuo ^{[3
]}

Miyoshi, Toshinobu ^{[3
]}

机构：

[1] Kyoto Univ, Grad Sch Sci, Dept Phys, Sakyo Ku, Kyoto 6068502, Japan

[2] Grad Univ Adv Studies SOKENDAI, Grad Sch High Energy Accelerator Sci, High Energy Accelerator Res Org KEK, Dept Particle & Nucl Phys, Tsukuba, Ibaraki 3050801, Japan

[3] High Energy Accelerator Org, Inst Particle & Nucl Studies, KEK, Tsukuba, Ibaraki 3050801, Japan

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2014年 / 765卷

基金：

日本学术振兴会;

关键词：

Monolithic active pixel sensors; Silicon-on-insulator technology; X-ray; Astronomy;

D O I：

10.1016/j.nima.2014.05.025

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We are developing a monolithic active pixel sensor referred to as XRPIX for X-ray astronomy on the basis of silicon-on-insulator CMOS technology. A crucial issue in our recent development is the impact of incomplete charge collection on the spectroscopic performance. In this paper, we report the spectral responses of several devices having different intra-pixel structures or produced from different wafers. We found that an emission line spectrum exhibits large low-energy tails when the size of the buried p-well, which acts as the charge-collection node, is small. Moreover, in charge sharing events, the peak channels of the emission lines shift toward channels lower than those without charge sharing. This peak shift is more pronounced as the distance between the pixel center and the position of incident photon increases. This suggests that the charge-collection efficiency is degraded at the pixel boundary. We also found that the charge-collection efficiency depends on the strength of the electric field at the interface of the depletion and insulator layers. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：183 / 186

页数：4

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