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| 用于二维光电器件的高分辨率光电流成像系统 |
| High-resolution photocurrent imaging system for two-dimensional optoelectronic devices |
| 投稿时间：2024-03-08 |
| DOI：10.3969/j.issn.1005-5630.202403080044 |
| 中文关键词: 二维材料 光电探测器 光电流扫描 二硫化钼 |
| 英文关键词:two-dimensional material photodetector photocurrent scanning MoS2 |
| 基金项目:国家自然科学基金（61731020） |
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| 摘要点击次数: 93 |
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| 中文摘要: |
| 光电流扫描成像能够反映二维材料光电器件的材料均匀性和电势分布等信息，是一种重要的测试技术。目前国内相关报道中关于光电流扫描系统的搭建缺少系统性的步骤介绍，尤其是关于提高扫描分辨率的聚焦光路搭建方法的描述更是一笔带过。为了让国内科研人员减少在模糊步骤中的长时间试错，结合高效空间滤波系统搭建了一种能提高成像分辨率的光电流扫描显微成像系统，其空间分辨率接近衍射极限。基于该系统，实现了对基于MoS2二维半导体材料的光电探测器中电子–空穴对的激发和输运测量，研究了金属–半导体肖特基势垒附近的光电流分布，对光电流的形成机制进行了简要分析。该系统的成功搭建可使一些中小型实验室较为方便地仿照搭建相应的光电流扫描系统，以降低试错成本，提高对二维材料光电器件的研究能力。 |
| 英文摘要: |
| Photocurrent scanning imaging is an important test technique for revealing the material uniformity and potential distribution of two-dimensional material optoelectronic devices. However, current domestic reports lack systematic descriptions of photocurrent scanning systems construction, particularly regarding focusing optical path assembly methods for improving scanning resolution. To reduce trial-and-error costs for researchers, this study integrates an efficient spatial filtering system to develop a high-resolution photocurrent scanning microscopy system approaching the diffraction limit. It realized a high-resolution photocurrent scanning microscopy imaging system with spatial resolution close to the diffraction limit which was combined with efficient spatial filtering system. The measurements of excitation and transport of electron-hole pairs in photodetectors based on MoS2 two-dimensional semiconductor materials were demonstrated. It also systematically studied the distribution of photocurrent near the asymmetric Schottky junctions and briefly analyzed the mechanism of photocurrent formation. The system can be adopted in some medium and small-sized laboratory in China to conveniently replicate and build their own photocurrent scanning systems, which reduces some trial-and-error costs and greatly improves the research ability of two-dimensional material optoelectronic devices. |
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