期刊
NANO RESEARCH
卷 9, 期 9, 页码 2641-2651出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-016-1151-5
关键词
molybdenum diselenide; layer transition metal dichalcogenide (TMD); urtrathin nanosheet; heterojunction; ultrafast photoresponse
类别
资金
- National Basic Research Program of China [2012CB922001]
- National Natural Science Foundation of China [21571166, 61076040, 51271173, 21071136]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [2012011111006]
- Nature Science Foundation of Anhui Province [J2014AKZR0059]
- Fundamental Research Funds for the Central Universities [JZ2015HGXJ0182, JZ2014HGBZ0063, WK6030000019]
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 similar to 1.2 x 10(12) Jones, and noise current approaching 0.1 pA center dot Hz(-1/2) at 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.
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