用于DarkSide-20k时间投影室透明电极的PEDOT:PSS的温度依赖光致发光特性
Temperature-Dependent Photoluminescence of PEDOT:PSS for use as Transparent Electrodes in the DarkSide-20k Time Projection Chamber
AI总结：
本研究针对DarkSide-20k时间投影室的新型透明电极材料Clevios，表征其4K-300K下紫外激发的荧光特性，发现其荧光远弱于常用材料TPB，可降低稀有事件探测的背景干扰。
摘要：
填充稀有元素的双相时间投影室（TPCs）被用于粒子探测，其中许多聚焦于稀有事件搜寻。这类探测器测量两种信号：一种来自闪烁光，另一种来自漂移的电离电子。DarkSide-20k的设计采用带有外部光电探测器的透明容器。用于漂移电子的电极位于活性介质与光电探测器之间，因此需要具备透光性，使闪烁光能够穿透。DarkSide-20k使用的透明电极涂层是聚(3,4-乙烯二氧噻吩)聚苯乙烯磺酸盐（PEDOT:PSS），即Clevios。对于稀有事件搜寻探测器而言，位于活性体积与光电探测器之间的材料的荧光可能会在数据中产生背景。由于Clevios是一种用于TPC电极的新型材料，需要表征其荧光特性，以了解其对背景的潜在影响。此前的研究表明，Clevios可以产生荧光，在紫外激发下荧光强度达到最大。本研究采用时间分辨和光谱技术，分析了Clevios在4 K至300 K温度范围内、紫外激发下的荧光特性。我们发现，与TPC中常用的荧光材料（如1,1,4,4-四苯基-1,3-丁二烯，TPB）的荧光相比，Clevios的荧光可以忽略不计。
英文摘要：
Dual-phase time-projection chambers (TPCs) filled with noble elements are used for particle detection, with many focusing on rare-event searches. These detectors measure two signals: one from scintillation light, and another from drifting ionized electrons. The DarkSide-20k design uses a transparent vessel with external photodetectors. Electrodes, used to drift the electrons, are located between the active medium and the photodetectors, requiring them to be transparent to allow scintillation light to transmit through them. The transparent electrode coating for DarkSide-20k is poly(3,4-ethylenedioxythiophene) poly(styrene sulfonate) (PEDOT:PSS) or Clevios. For rare-event search detectors, the fluorescence of materials that are between the active volume and the photodetectors may lead to backgrounds in the data. Since Clevios is a new material for TPC electrodes, its fluorescent properties need to be characterized to understand their potential impact on backgrounds. Previous studies have indicated that Clevios can fluoresce, with maximal fluorescence produced using UV-excitation. Our study analyzes the fluorescence of Clevios, under UV-excitation, using both time-resolved and spectral techniques between 4 K and 300 K. We find that the fluorescence of Clevios is negligible when compared to the fluorescence of common fluorescent materials used in TPCs, such as 1,1,4,4-tetraphenyl-1,3-butadiene (TPB).
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