3 years ago
Printable Nanocomposite FeS2–PbS Nanocrystals/Graphene Heterojunction Photodetectors for Broadband Photodetection
Judy Z. Wu, Dan Ewing, Ryan Goul, Alan Elliot, Maogang Gong, Alex Stramel, Qingfeng Liu, Matthew Casper
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 ∼106 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 ∼106 A/W at UV to 103 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.
Publisher URL: http://dx.doi.org/10.1021/acsami.7b08226
DOI: 10.1021/acsami.7b08226
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