Two-dimensional material-based photodetectors (PDs) show great potential owing to unique optoelectronic characteristics and attract much attention in research. However, poor absorption of two-dimensional material remains a vital restriction. Responsivity improvement by applying Au nanoparticles (NPs) through surface plasmon (SP) is studied both in theory and simulation. The effect of size and NPs distribution density is analyzed concerning absorption promotion and fabrication feasibility. Both absorption spectrum and inner electric field are studied. A novel face-to-face PD is proposed that performs better in visible range. The results can be helpful in two-dimensional material PD design and fabrication where high responsivity is required.

中文翻译：

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表面等离子体对二维材料光电探测器的改进

二维材料基光电探测器（PDs）由于其独特的光电特性而显示出巨大的潜力，在研究中备受关注。然而，二维材料的不良吸收仍然是一个重要的限制。通过表面等离子体 (SP) 应用金纳米粒子 (NP) 来提高响应度在理论和模拟方面都进行了研究。分析了尺寸和纳米粒子分布密度对吸收促进和制造可行性的影响。吸收光谱和内电场都进行了研究。提出了一种在可见光范围内表现更好的新型面对面 PD。该结果有助于二维材料 PD 设计和制造，其中需要高响应度。