Wavelength-Controlled Photocurrent Polarity Switching in BP-MoS2 Heterostructure,Advanced Functional Materials

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Wavelength-Controlled Photocurrent Polarity Switching in BP-MoS2 Heterostructure
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-03-20 , DOI: 10.1002/adfm.202112696
Himani Jawa ₁ , Abin Varghese _{1,

2} , Sayantan Ghosh ₁ , Srilagna Sahoo ₁ , Yuefeng Yin ₂ , Nikhil V Medhekar ₂ , Saurabh Lodha ₁

Affiliation

Layered 2D van der Waals semiconductors and their heterostructures have been shown to exhibit positive photoconductance (PPC) in many studies. A few recent reports have demonstrated negative photoconductance (NPC) as well that can enable broadband photodetection besides multi-level optoelectronic logic and memory. Controllable and reversible switching between PPC and NPC is a key requirement for these applications. This report demonstrates visible-to-near infrared wavelength-driven NPC and PPC, along with reversible switching between the two, in an air stable, high mobility, broadband black phosphorus field effect transistor covered with a few layer MoS₂ flake. The crossover switching wavelength can be tuned by varying the MoS₂ bandgap through its flake thickness and the NPC and PPC photoresponsivities can be modulated using electrostatic gating as well as laser power. Recombination-driven NPC and PPC, as supported by density functional theory calculations, allows for reversible switching. Further, gate voltage-dependent negative persistent photoconductance is well-suited for optosynaptic applications.

中文翻译：

BP-MoS2 异质结构中的波长控制光电流极性切换

在许多研究中，层状二维范德华半导体及其异质结构已显示出正光电导 (PPC)。最近的一些报告已经证明除了多级光电逻辑和存储器之外，负光电导 (NPC) 还可以实现宽带光电检测。PPC 和 NPC 之间的可控和可逆切换是这些应用的关键要求。_{该报告展示了在覆盖有几层 MoS 2}薄片的空气稳定、高迁移率、宽带黑磷场效应晶体管中，可见到近红外波长驱动的 NPC 和 PPC，以及两者之间的可逆切换。可以通过改变 MoS _{2来调整交叉开关波长}带隙通过其薄片厚度和 NPC 和 PPC 光响应性可以使用静电门控以及激光功率进行调制。在密度泛函理论计算的支持下，重组驱动的 NPC 和 PPC 允许可逆切换。此外，栅极电压相关的负持续光电导非常适合光突触应用。

更新日期：2022-03-20

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