表面等离子体增强的基于一维半导体纳米结构的光电探测器研究

发布时间：2018-05-01 01:40

本文选题：光电探测器 + 局部表面等离子共振　；参考：《合肥工业大学》2015年硕士论文

【摘要】：硒化镉(CdSe)以及硫化铋(Bi2S3)由于室温下具有适中的禁带宽度,吸引了广泛注意,并被用来制造各种电子和光电子器件。然而,基于其二者纳米结构的光电探测器件性能却受到响应度低的限制,研究发现这是由于CdSe与Bi2S3纳米带的截面较小,常常只有几十纳米。在本论文中,我们研究了一种具有等离子体效应并对红光有高灵敏度的光电探测器。这种光电探测器是由CdSe、Bi2S3纳米带及其表面修饰的一层具有等离子效应的空心纳米金颗粒(HGNs)组成,可以通过局部表面等离子体共振(LSPR)来耦合入射光。研究发现修饰了HGNs的CdSe、Bi2S3纳米带光电探测器对650m的红光有明显的敏感性,并且重复性优异。此外,相比未经修饰的光电探测器,光电流有很大的提高,这也导致了修饰后的器件响应度,探测率都有所提高。通过理论模拟,我们发现光电流的增加是由于光激发HGNs产生LSPR特性促使其直接将电子转移到CdSe、Bi2S3纳米带里。研究的总体表明修饰空心纳米金颗粒可能是一种合理调节光,并且优化基于半导体材料光电子器件性能的方法。
[Abstract]:Cadmium selenide (CdSe) and bismuth sulphide (Bi2S3) have attracted wide attention due to their moderate bandgap at room temperature and have been used to manufacture various electronic and optoelectronic devices. However, the performance of photodetectors based on their nanostructures is limited by the low responsivity. It is found that this is due to the small cross-section of CdSe and Bi2S3 nanobelts, which are often only tens of nanometers. In this thesis, we study a kind of photodetector with plasma effect and high sensitivity to red light. The photodetector is composed of CdSeO Bi2S3 nanobelts and a layer of hollow gold nanoparticles with plasma effect HGNs, which can be coupled with incident light by local surface plasmon resonance (LSPRR). It is found that the photodetectors modified with HGNs have obvious sensitivity to 650m red light and excellent reproducibility. In addition, compared with the unmodified photodetector, the photocurrent is greatly improved, which leads to the improved device responsivity and detection rate. Through theoretical simulation, we find that the increase of photocurrent is caused by the LSPR characteristics of photoexcited HGNs to transfer electrons directly into CdSee Bi2S3 nanobelts. The results show that the modified hollow gold nanoparticles may be a reasonable way to adjust the light and optimize the performance of photoelectron devices based on semiconductor materials.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1

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