在多层范德瓦尔斯异构结构中的动量直接红外介层激发和光检测
Chao Zhang1,2, Kai Wu1,2, Lu Gan3
1School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China.
ACS nano
|November 27, 2024
概括
这项研究引入了一种新的WSe2/InSe范德瓦尔斯异构结构 (vdWH),表现出动量直接的介层激子 (IX) 和红外吸收. 这一突破使得用于光电子应用的先进近红外光探测器的开发成为可能.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
背景情况:
- 层间激子 (IX) 是二类范德瓦尔斯异构结构 (vdWH) 中的关键准粒子.
- 现有的研究主要集中在可见光发射的动量间接IX,忽视动量直接IX和对设备应用至关重要的红外吸收.
研究的目的:
- 提出和建造一个WSe2/InSe vdWH,容纳动量直接的IX和近红外层间层吸收.
- 描述IX的特性,并展示一个功能性的近红外vdWH光探测器.
主要方法:
- 第一个原则密度函数理论计算.
- 取决于功率和温度的光发光谱学.
- 一个近红外vdWH光探测器的制造和特征.
主要成果:
- 证明了一种多层WSe2/InSe vdWH,在室温下具有动量直接的IX和近红外吸收.
- 测量了43±5 meV的IX结合能量,并将电气调节的IX能量调整为180 meV.
- 实现了近红外光探测器,其光响应度为33 A W-1,探测能力为1.8 × 1010 Jones,响应时间为3.7μs在1150nm.
结论:
- 开发的WSe2/InSe vdWH成功地接收了动量直接的IX,并显示了红外吸收.
- 该研究表明,在光电子设备中,具有直流动量IX的红外响应VDWH具有潜力.
- 制造的光电探测器在近红外探测和成像应用中显示出有前途的性能.
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