Mid-infrared assisted transport at the nano-junction between graphene and a doped-diamond scanning probe

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications Pub Date : 2024-02-01 DOI:10.1016/j.photonics.2024.101243

Tommaso Venanzi , Maria Eleonora Temperini , Leonetta Baldassarre , Michele Ortolani , Valeria Giliberti

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Abstract

We report mid-infrared photoconductive atomic-force microscopy (AFM) of a graphene sheet with doped-diamond AFM probes illuminated with a quantum cascade laser. The diamond probe ensures high mechanical and electrical stability. We observe a prominent photoconduction at finite biases that we interpret as the overcoming of a potential barrier formed at the graphene-diamond junction by free carriers excited by mid-infrared photons (220 meV photon energy). Moreover, we observe a small photo-thermoelectric effect of graphene under zero applied bias. We demonstrate that the use of diamond AFM probes for mid-infrared photoconductive AFM has great potential to investigate the nanometric inhomogeneities of the Fermi level and of the work function across integrated semiconductor devices.

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石墨烯与掺杂金刚石扫描探针纳米接合处的中红外辅助传输

我们报告了利用量子级联激光照射的掺杂金刚石原子力显微镜探针对石墨烯薄片进行中红外光电导原子力显微镜（AFM）观察的结果。金刚石探针确保了高度的机械和电气稳定性。我们观察到在有限偏压下的显著光电导现象，并将其解释为中红外光子（光子能量为 220 meV）激发的自由载流子克服了石墨烯-金刚石交界处形成的势垒。此外，我们还观察到石墨烯在零外加偏压下的微弱光热电效应。我们证明，使用金刚石原子力显微镜探针进行中红外光电导原子力显微镜研究，在研究费米级的纳米不均匀性和集成半导体器件的功函数方面具有巨大潜力。

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来源期刊

Photonics and Nanostructures-Fundamentals and Applications 工程技术-材料科学：综合

CiteScore

5.00

自引率

3.70%

发文量

审稿时长

62 days

期刊介绍： This journal establishes a dedicated channel for physicists, material scientists, chemists, engineers and computer scientists who are interested in photonics and nanostructures, and especially in research related to photonic crystals, photonic band gaps and metamaterials. The Journal sheds light on the latest developments in this growing field of science that will see the emergence of faster telecommunications and ultimately computers that use light instead of electrons to connect components.