Efficient Energy Transfer Enabled by Dark States in van der Waals Heterostructures.

IF 15.8 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY ACS Nano Pub Date : 2024-11-12 Epub Date: 2024-10-29 DOI:10.1021/acsnano.4c09403
Ziyu Luo, Xiao Yi, Ying Jiang, Nannan Luo, Bingjie Liu, Yangguang Zhong, Qin Tan, Qi Jiang, Xinfeng Liu, Shula Chen, Yuerui Lu, Anlian Pan
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Abstract

Dark exciton states show great potential in condensed matter physics and optoelectronics because of their long lifetime and rich distribution in band structures. Therefore, they can theoretically serve as efficient energy reservoirs, providing a platform for future applications. However, their optical-transition-forbidden nature severely limits their experimental exploration and hinders their current application. Here, we demonstrate a universal dark state nonlinear energy transfer (ET) mechanism in monolayer WS2/CsPbBr3 van der Waals heterostructures under two-photon excitation, which successfully utilizes the enormous energy reserved in the dark exciton state of CsPbBr3 to significantly improve the photoelectric performance of monolayer WS2. We first propose the scenario of resonant ET between the dark state of CsPbBr3 and WS2, and then reveal that this is a typical Förster resonant ET and belongs to the 2D-2D category. Interestingly, the dark state ET in CsPbBr3 is identified as a long-range donor-bridge-acceptor hopping mode, with a potential distance exceeding 200 nm. Finally, we successfully achieve nearly an order of magnitude enhancement in the near-infrared detection performance of monolayer WS2. Our results enrich the theory of dark exciton states and ET, and they provide a way of using dark exciton states for future practical applications.

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范德瓦尔斯异质结构中暗态促成的高效能量转移。
暗激子态在凝聚态物理和光电子学中显示出巨大的潜力,因为它们的寿命长,在带状结构中分布丰富。因此,理论上它们可以作为高效的储能器,为未来的应用提供平台。然而,它们的光跃迁禁区特性严重限制了它们的实验探索,阻碍了它们在当前的应用。在这里,我们展示了在双光子激发下单层 WS2/CsPbBr3 范德华异质结构中的一种通用暗态非线性能量转移(ET)机制,它成功地利用了 CsPbBr3 暗激子态的巨大能量储备,显著提高了单层 WS2 的光电性能。我们首先提出了 CsPbBr3 暗态与 WS2 之间的共振 ET,然后揭示了这是一种典型的佛斯特共振 ET,属于 2D-2D 范畴。有趣的是,CsPbBr3 的暗态 ET 被确定为长程供体-桥-受体跳跃模式,其潜在距离超过 200 nm。最后,我们成功地使单层 WS2 的近红外探测性能提高了近一个数量级。我们的研究结果丰富了暗激子态和 ET 的理论,并为暗激子态在未来的实际应用提供了一条途径。
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来源期刊
ACS Nano
ACS Nano 工程技术-材料科学:综合
CiteScore
26.00
自引率
4.10%
发文量
1627
审稿时长
1.7 months
期刊介绍: ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.
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