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Planar carbon nanotube–graphene hybrid films for high-performance broadband photodetectors

Abstract : Graphene has emerged as a promising material for photonic applications fuelled by its superior electronic and optical properties. However, the photoresponsivity is limited by the low absorption cross-section and ultrafast recombination rates of photoexcited carriers. Here we demonstrate a photoconductive gain ofB105 electrons per photon in a carbon nanotube–graphene hybrid due to efficient photocarriers generation and transport within the nanostructure. A broadband photodetector (covering 400–1,550 nm) based on such hybrid films is fabricated with a high photoresponsivity of >100AW-1 and a fast response time of B100 ms. The combination of ultra-broad bandwidth, high responsivities and fast operating speeds affords new opportunities for facile and scalable fabrication of all-carbon optoelectronic devices.
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Yuanda Liu, Fengqiu Wang, Xiaomu Wang, Xizhang Wang, Emmanuel Flahaut, et al.. Planar carbon nanotube–graphene hybrid films for high-performance broadband photodetectors. Nature Communications, Nature Publishing Group, 2015, 6, pp.8589/1-8589/7. ⟨10.1038/ncomms9589⟩. ⟨hal-02442098⟩

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