期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 33, 页码 27801-27808出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b08226
关键词
FeS2-PbS; graphene; nanohybrids; van der Waals heterostructures; printable broadband photodetector
资金
- Plant Directed Research and Development funds from the Department of Energy's National Security Campus
- Honeywell Federal Manufacturing and Technologies, LLC [DE-NA0002839]
- ARO [W911NF-16-1-0029]
- NSF [NSF-DMR-1337737, NSF-DMR-1508494]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1508494] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1337737] Funding Source: National Science Foundation
Colloidal nanocrystals are attractive materials for optoelectronics applications because they offer a compelling combination of low-cost solution processing, printability, and spectral tunability through the quantum dot size effect. Here we explore a novel nanocomposite photosensitizer consisting of colloidal nanocrystals of FeS2 and PbS with complementary optical and microstructural properties for broadband photodetection. Using a newly developed ligand exchange to achieve high-efficiency charge transfer across the nanocomposite FeS2-PbS sensitizer and graphene on the FeS2-PbS/graphene photoconductors, an extraordinary photoresponsivity in exceeding similar to 10(6) A/W was obtained in an ultrabroad spectrum of ultraviolet (UV)-visible-near-infrared (NIR). This is in contrast to the nearly 3 orders of magnitude reduction of the photoresponsivity from similar to 10(6) A/W at UV to 10(3) A/W at NIR on their counterpart of FeS2/graphene detectors. This illustrates the combined advantages of the nanocomposite sensitizers and the high charge mobility in FeS2-PbS/graphene van der Waals heterostructures for nanohybrid optoelectronics with high performance, low cost, and scalability for commercialization.
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