Journal
ADVANCED MATERIALS
Volume 32, Issue 25, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202002237
Keywords
bolometric effect; Fe3O4 nanosheets; long-wavelength infrared; photoconductive effect; ultrabroadband photodetectors
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Funding
- National Natural Science Foundation of China [51722204, 51972041, 51972042]
- National Major Science and Technology Projects of China [2017ZX02201002]
- National Key Basic Research Program of China [2014CB931702]
- Sichuan Science and Technology Program [2016RZ0033, 2018RZ0082]
- Young Elite Scientists Sponsorship Program by CAST [2018QNRC001]
- Key Research Program of Frontier Sciences of the Chinese Academy of Sciences [ZDBS-LY-JSC010]
- Natural Science Foundation of Guangdong Province [2018A030310225]
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The ultrabroadband spectrum detection from ultraviolet (UV) to long-wavelength infrared (LWIR) is promising for diversified optoelectronic applications of imaging, sensing, and communication. However, the current LWIR-detecting devices suffer from low photoresponsivity, high cost, and cryogenic environment. Herein, a high-performance ultrabroadband photodetector is demonstrated with detecting range from UV to LWIR based on air-stable nonlayered ultrathin Fe3O4 nanosheets synthesized via a space-confined chemical vapor deposition (CVD) method. Ultrahigh photoresponsivity (R) of 561.2 A W-1, external quantum efficiency (EQE) of 6.6 x 10(3)%, and detectivity (D*) of 7.42 x 10(8) Jones are achieved at the wavelength of 10.6 mu m. The multimechanism synergistic effect of photoconductive effect and bolometric effect demonstrates the high sensitivity for light with any light intensities. The outstanding device performance and complementary mixing photoresponse mechanisms open up new potential applications of nonlayered 2D materials for future infrared optoelectronic devices.
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