Terahertz photodetection in scalable single-layer-graphene and hexagonal boron nitride heterostructures
Terahertz photodetection in scalable single-layer-graphene and hexagonal boron nitride heterostructures
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DOI：
10.1063/5.0097726
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发表时间：
2022-07-18
影响因子：
4
通讯作者：
Vitiello, M. S.
中科院分区：
文献类型：
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作者：
Asgari, M.;Viti, L.;Vitiello, M. S.
单层石墨烯（SLG）独特的光电特性是开发从X射线到微波的广泛频率范围内的光子器件的理想选择。在太赫兹（THz）频率范围（0.1-10 THz）中，这导致了具有最先进性能的光学调制器、非线性源和光电探测器的发展。一个关键的挑战是以可扩展的方式将基于SLG的有源元件与预先存在的技术平台集成，同时保持性能水平不受干扰。在这里，我们报告室温太赫兹探测器制成的大面积SLG，生长的化学气相沉积（CVD）和天线耦合场效应晶体管集成。我们选择性地激活的光热电检测动力学，我们采用不同的介电配置的SLG上的Al 2 O3与和没有大面积CVD六方氮化硼盖帽，以研究其对SLG的热电性能支撑光电探测的影响。利用这些可扩展架构，在零偏置操作下实现了类似于5 ns的响应时间和类似于1 nW Hz（-1/2）的噪声等效功率（NEP）。这表明了可扩展的，大面积的，分层的材料异质结构的太赫兹探测的可行性。(C)2022年作者。
The unique optoelectronic properties of single layer graphene (SLG) are ideal for the development of photonic devices across a broad range of frequencies from x rays to microwaves. In the terahertz (THz) frequency range (0.1-10 THz), this has led to the development of optical modulators, nonlinear sources, and photodetectors with state-of-the-art performances. A key challenge is the integration of SLG-based active elements with pre-existing technological platforms in a scalable way, while maintaining performance level unperturbed. Here, we report room temperature THz detectors made of large-area SLG, grown by chemical vapor deposition (CVD) and integrated in antenna-coupled field effect transistors. We selectively activate the photo-thermoelectric detection dynamics, and we employ different dielectric configurations of SLG on Al2O3 with and without large-area CVD hexagonal boron nitride capping to investigate their effect on SLG thermoelectric properties underpinning photodetection. With these scalable architectures, response times similar to 5 ns and noise equivalent powers (NEPs) similar to 1 nW Hz(-1/2) are achieved under zero-bias operation. This shows the feasibility of scalable, large-area, layered material heterostructures for THz detection. (C) 2022 Author(s).