Highly efficient gate-tunable photocurrent generation in vertical heterostructures of layered materials

By W. Yu, Yuan Liu, Hailong Zhou, Anxiang Yin, Zheng Li, Yu Huang, Xiangfeng Duan. Nature Nanotechnology, 2013

1,101 citations recorded by the source corpus.

Layered materials of graphene and MoS2, for example, have recently emerged as an exciting material system for future electronics and optoelectronics. Vertical integration of layered materials can enable the design of novel electronic and photonic devices. Here, we report highly efficient photocurrent generation from vertical heterostructures of layered materials. We show that vertically stacked graphene–MoS2–graphene and graphene–MoS2–metal junctions can be created with a broad junction area for efficient photon harvesting. The weak electrostatic screening effect of graphene allows the integration of single or dual gates under and/or above the vertical heterostructure to tune the band slope and photocurrent generation. We demonstrate that the amplitude and polarity of the photocurrent in the gated vertical heterostructures can be readily modulated by the electric field of an external gate to achieve a maximum external quantum efficiency of 55% and internal quantum efficiency up to 85%. Our study establishes a method to control photocarrier generation, separation and transport processes using an external electric field.

Subfields: Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/bdfbf73116b88db636791ad0138248fae11b9e5a

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Citations in the corpus

Optoelectronic devices based on two-dimensional transition metal dichalcogenides (2016, background): “By carefully choosing the stack sequence, numerous novel vertical heterostructure devices based on 2D materials have been demonstrated, including the Schottky junctions [44, 82], p–n junctions [84, 97], and tunneling structures [40, 110].”
Towards graphene plasmon-based free-electron infrared to X-ray sources (2015, background): “Recent advances in the fabrication of graphene heterostructures [40, 41, 42] have demonstrated the feasibility of such multilayer structures.”