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Design and construction of ultra-thin MoSe2 nanosheet-based heterojunction for high-speed and low-noise photodetection

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Nano Research 2016年第9期9卷 2641-2651页

作者： Xiangshun Geng Yongqiang Yu Xiaoli Zhou Chunde Wang Kewei Xu Yan Zhang Chunyan Wu Li Wang Yang Jiang Qing Yang School of Electrical Science and Applied Physics Hefei University of TechnologyHefei 230009China Hefei National Laboratory for Physical Sciences at Microscale Department of ChemistryLaboratory of Nanomaterials for Energy Conversion and Synergetic Innovation Center of Quantum Information & Quantum PhysicsUniversity of Science and Technology of China(USTC)Hefei 230026China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China

Advances in the photocurrent conversion of two-dimensional (2D) transition metal dichalcogenides have enabled the realization and application of ultrasensitive and broad-spectral photodetectors. The requirements of previous devices constantly drive for complex technological implementation, resulting in limits in scale and complexity. Furthermore, the development of large-area and low-cost photodetectors would be beneficial for applications. Therefore, we demonstrate a novel design of a heterojunction photodetector based on solution-processed ultrathin MoSe2 nanosheets to satisfy the requirements of its application. The photodetector exhibits a high sensitivity to visible–near infrared light, with a linear dynamic range over 124 decibels (dB), a detectivity of ~1.2 × 1012Jones, and noise current approaching 0.1 pA·Hz–1/2at zero bias. Significantly, the device shows an ultra-high response speed up to 30 ns with a 3-dB predicted bandwidth over 32 MHz, which is far better than that of most of the 2D nanostructured and solution-processable photodetectors reported thus far and is comparable to that of commercial Si photodetectors. Combining our results with material-preparation methods, together with the methodology of device fabrication presented herein, can provide a pathway for the large-area integration of low-cost, high-speed photodetectors. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

关键词： molybdenum diselenide layer transition metal dichalcogenide (TMD) urtrathin nanosheet heterojunction ultrafast photoresponse

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