期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 11, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202108174
关键词
heterojunction; infrared photodetectors; molybdenum sulfide; silicon nanowires; weak light detection
类别
资金
- Major Research Plan of the National Natural Science Foundation of China [91833303]
- Natural Science Foundation of Jiangsu Province [BK20200857]
- Foundation for Innovation Research Groups of the National Natural Science Foundation of China [51821002]
- Major International (Regional) Joint Research Project of the National Natural Science Foundation of China [51920105005]
- Entrepreneurship and Innovation Doctor of Jiangsu Province [JSSCBS20210704]
- Opening Foundation of Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
This study presents a high-sensitivity photodetector based on a conformal MoS2/silicon nanowire array heterojunction with an ultrathin Al2O3 interfacial passivation layer, which can exhibit broadband photoresponse ranging from 300 to 1600 nm and detect ultra-weak infrared signals effectively. The device is capable of detecting ultra-weak IR signals without applying any external bias, showing great potential for low-cost and high-performance optoelectronic devices.
2D layered materials have attracted considerable attention for fabricating IR photodetectors. However, performance, especially for weak signal detection, of these IR photodetectors is often limited by the low absorbance of the very thin active materials as well as unsuppressed dark currents. Herein, a photodetector with high sensitivity for ultraweak IR signals based on a conformal MoS2/silicon nanowire array heterojunction with an ultrathin Al2O3 interfacial passivation layer is reported. The conformal light-trapping nanoarray structure can greatly enhance broadband IR absorption, while the Al2O3 layer can suppress interface carrier recombination effectively and thus lower reverse dark current. The photodetectors exhibit broadband photoresponse ranging from 300 to 1600 nm, low noise current of 0.11 pA Hz(-1/2), large responsivity up to 0.61 A W-1 at zero bias voltage, and high specific detectivity of 10(11)-10(12) Jones. Significantly, the devices are capable of detecting ultraweak IR signals (e.g., 100 pW at 808 nm and 3 nW at 1310/1550 nm) with high on-off ratios without applying any external bias. This work proposes a new strategy to enhance light absorption of 2D materials and construct high-quality junction based on them, which is promising for low-cost and high-performance optoelectronic devices.
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