Broadband Photoresponse Enhancement of a High-Performance t-Se Microtube Photodetector by Plasmonic Metallic Nanoparticles

Broadband responsivity enhancement of single Se microtube (Se-MT) photodetectors in the UV-visible region is presented in this research. The pristine Se-MT photodetector demonstrates broadband photoresponse from 300 to 700 nm with peak responsivity of approximate to 19 mA W-1 at 610 nm and fast speed (rise time 0.32 ms and fall time 23.02 ms). To further enhance the responsivity of the single Se-MT photodetector, Au and Pt nanoparticles (NPs) are sputtered on these devices. In contrast to only enhancement of responsivity in UV region by Pt NPs, broadband responsivity enhancement (approximate to 600% to approximate to 800%) of the Se-MT photodetector is realized from 300 to 700 nm by tuning the size and density of Au NPs. The broadband responsivity enhancement phenomena are interpreted by both the surface modification and surface plasmon coupling. The experimental results of this work provide an additional opportunity for fabricating high-performance UV-visible broadband photodetectors.

本研究展示了单根硒微管（Se - MT）光电探测器在紫外 - 可见光区域的宽带响应度增强。原始的Se - MT光电探测器在300到700 nm范围内呈现宽带光响应，在610 nm处的峰值响应度约为19 mA/W，且速度快（上升时间0.32 ms，下降时间23.02 ms）。为了进一步提高单根Se - MT光电探测器的响应度，在这些器件上溅射了金和铂纳米粒子（NPs）。与铂纳米粒子仅在紫外区域增强响应度不同，通过调节金纳米粒子的尺寸和密度，实现了Se - MT光电探测器在300到700 nm范围内宽带响应度增强（约600%到约800%）。宽带响应度增强现象通过表面修饰和表面等离子体耦合来解释。这项工作的实验结果为制造高性能紫外 - 可见光宽带光电探测器提供了额外的机会。