Integrated Semiconductor Quantum Dot Scintillation Detector: Ultimate Limit for Speed and Light Yield
Integrated Semiconductor Quantum Dot Scintillation Detector: Ultimate Limit for Speed and Light Yield
复制标题
集成半导体量子点闪烁探测器：速度和光产额的极限
DOI：
10.1109/tns.2015.2502426
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发表时间：
2016
影响因子：
1.8
通讯作者：
P. Murat
中科院分区：
文献类型：
--
作者：
S. Oktyabrsky;M. Yakimov;V. Tokranov;P. Murat
带电粒子和光子的皮秒范围计时是许多高能物理、生物物理、医学和安全应用的长期挑战。我们提出了一种设计，技术途径和挑战，以及实现超快高效的室温半导体闪烁体的基础上自组装InAs量子点（QD）嵌入在GaAs矩阵的一些重要属性。低量子点密度（<; 1015 cm-3）、快速（~5 ps）电子捕获、发光峰从GaAs吸收边红移0.2-0.3 eV、具有快速衰减时间（0.5-1 ns）沿着以及GaAs基质中的有效能量转移（4.2 eV/对）允许制造具有无与伦比的性能参数的半导体闪烁体。主要的技术挑战是制造大体积（> 1cm 3）的外延QD介质。这需要多个膜分离和结合，可能使用单独的外延膜作为波导以改善光耦合。与传统的无机闪烁器相比，基于量子点的闪烁器可以具有大约5倍的光产额和20倍的衰减时间，为伽马探测器开辟了一条能量分辨率优于1%和持续计数率MHz的道路。皮秒级计时需要与闪烁体集成的分段式低电容光电二极管。对于光子，所提出的探测器固有地提供了相互作用的深度信息。
A picosecond-range timing of charged particles and photons is a long-standing challenge for many high-energy physics, biophysics, medical and security applications. We present a design, technological pathway and challenges, and some properties important for realization of an ultrafast high-efficient room-temperature semiconductor scintillator based on self-assembled InAs quantum dots (QD) embedded in a GaAs matrix. Low QD density (<; 1015 cm-3), fast (~5 ps) electron capture, luminescence peak redshifted by 0.2-0.3 eV from GaAs absorption edge with fast decay time (0.5-1 ns) along with the efficient energy transfer in the GaAs matrix (4.2 eV/pair) allows for fabrication of a semiconductor scintillator with the unsurpassed performance parameters. The major technological challenge is fabrication of a large volume (> 1 cm3 ) of epitaxial QD medium. This requires multiple film separation and bonding, likely using separate epitaxial films as waveguides for improved light coupling. Compared to traditional inorganic scintillators, the semiconductor-QD based scintillators could have about 5x higher light yield and 20x faster decay time, opening a way to gamma detectors with the energy resolution better than 1% and sustaining counting rates MHz. Picosecond-scale timing requires segmented low-capacitance photodiodes integrated with the scintillator. For photons, the proposed detector inherently provides the depth-of-interaction information.
影响因子：
4
作者：
Kang, Zhitao;Zhang, Yuelan;Nagarkar, Vivek
通讯作者：
Nagarkar, Vivek