概括
本研究介绍了一种使用IV组材料的新型,低成本的光电探测器,用于高效的可见/短波红外探测. 该设备实现了广泛的光谱响应和快速响应时间,显著提高了性能.
科学领域:
- 光电学是指光电子产品.
- 材料科学 材料科学 材料科学
- 半导体物理 半导体物理
背景情况:
- 为宽带应用开发具有成本效益的光电探测器 (PD) 是至关重要的.
- 第四组材料为集成光电子提供了一个有前途的平台.
- 现有的PD通常在光谱范围或成本方面面临限制.
研究的目的:
- 提出和演示一个全集团IV石墨烯集成的光探测器,用于高效的可见/短波红外 (VIS/SWIR) 双带光响应.
- 为了研究石墨烯-锡 (GeSn) /Ge多个量子井 (MQWs) 提供的性能提升,范德瓦尔斯的异质连接.
- 建立一种设计低成本,高性能宽带PD的新方法.
主要方法:
- 在n-Ge基板上使用喷涂生长的无毒GeSn/Ge MQW制造垂直的石墨烯-i-n (Gr-i-n) 结构.
- 利用石墨烯和GeSn/GeMQW之间的范德瓦尔斯异质连接,形成一个延伸的表面耗尽区域.
- 描述光探测器的光谱响应,响应时间和外部量子效率 (EQE).
主要成果:
- 从400nm到2000nm实现了高效的VIS/SWIR双频光响应.
- 证明了23微秒的快速响应时间.
- 与没有石墨烯的PD相比,显著提高了EQE:在420nm时10.2倍 (40%),在660nm时5.2倍 (42%),在1520nm时1.2倍 (50%).
结论:
- 开发的Gr-i-n结构有效地利用GeSn/Ge MQWs范德瓦尔斯异质连接用于宽带光检测.
- 石墨烯的整合增强了载体分离和运输,从而提高了性能.
- 这项研究为推进低成本,所有IV组VIS/SWIR宽带光探测器提供了可行的途径.
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