Effect on MIM structured parallel quenching capacitor of SiPMs

作     者：Lee, Chaehun Sul, Woo Suk Kim, Hyoungtaek Kim, Chankyu Cho, Gyuseong 

作者机构：Korea Adv Inst Sci & Technol Dept Nucl & Quantum Engn Radiat Detect & Med Image Sensor Lab Taejon 305701 South Korea Natl NanoFab Ctr Taejon 305806 South Korea 

出 版 物：《NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT》 (物理学研究中的核仪器与方法，A辑：加速器，分光仪，检测器和相关设备)

年 卷 期：2011年第650卷第1期

页      面：125-128页

核心收录：

学科分类：08[工学] 0804[工学-仪器科学与技术] 0827[工学-核科学与技术] 0702[理学-物理学] 

主　　题：Silicon photomultiplier Single-photon pulse shape Quenching capacitor Metal-insulator-metal capacitor Time of flight PET (TOF-PET) 

摘      要：A SiPM is an array of several thousand micro-Geiger-mode APDs (GAPD), and a GAPD generally consists of a PN diode (C(d)), a quenching resistor (R(q)) and any parasitic capacitor (C(q)) in parallel to the quenching resistor. The single-photon pulse shape is determined by a RC decay time, a product of C(total) (C(d)+C(q)) and R(q). A large fraction of current in the long tailed single-photon pulse shape causes Scintillation detectors with SiPM to exhibit a poor timing resolution compared to PMTs, which have very narrow Gaussian single-photon pulse shape. In this paper, a similar to 40fF Metal-Insulator-Metal (MIM) quenching capacitor (C(q-MIM)) parallel to a quenching resistor in a Geiger mode APD is proposed to modify the single-photon pulse shape of a SiPM, in order to improve the timing performance of PET detectors. A single-photon pulse shape with C(q-MIM) has a very fast pulse with a low slow tail, consequently the increasing initial current. (C) 2010 Elsevier B.V. All rights reserved.