Journal
ADVANCED MATERIALS
Volume 29, Issue 22, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201700463
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Funding
- NSFC [61674127, 61274123, 61474099, 61431014, 21325417, 51533008]
- ZJ-NSF [LZ17F040001]
- China State Key Project [2016YFA0200204]
- Zhejiang University
- Fundamental Research Funds for the Central Universities [2016XZZX001-05]
- U.S. National Science Foundation [DMR1508144]
- ZJU Cyber Scholarship
- Cyrus Tang Center for Sensor Materials and Applications
- Open Research Fund of State Key Laboratory of Bioelectronics, Southeast University
- Open Research Fund of State Key Laboratory of Nanodevices and Applications at Chinese Academy of Sciences [14ZS01]
- Fellowship of Churchill College at University of Cambridge
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1508144] Funding Source: National Science Foundation
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High-performance photodetectors operating over a broad wavelength range from ultraviolet, visible, to infrared are of scientific and technological importance for a wide range of applications. Here, a photodetector based on van der Waals heterostructures of graphene and its fluorine-functionalized derivative is presented. It consistently shows broadband photoresponse from the ultraviolet (255 nm) to the mid-infrared (4.3 mu m) wavelengths, with three orders of magnitude enhanced responsivity compared to pristine graphene photo-detectors. The broadband photodetection is attributed to the synergistic effects of the spatial nonuniform collective quantum confinement of sp(2) domains, and the trapping of photoexcited charge carriers in the localized states in sp(3) domains. Tunable photoresponse is achieved by controlling the nature of sp(3) sites and the size and fraction of sp(3)/sp(2) domains. In addition, the photoresponse due to the different photoexcited-charge-carrier trapping times in sp(2) and sp(3) nano-domains is determined. The proposed scheme paves the way toward implementing high-performance broadband graphene-based photodetectors.
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