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

Yuanda Liu (1) , Fengqiu Wang (1) , Xiaomu Wang (2) , Xizhang Wang (1) , Emmanuel Flahaut (3) , Xiaolong Liu (1) , Yao Li (1) , Xinran Wang (1) , Yongbing Xu (1) , Yi Shi (1) , Rong Zhang (1)

1 NJU - Nanjing University
2 Yale University [New Haven]
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

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.

Mots clés: Carbon nanotube; Photodetector; Graphene; Optoelectronics

Domaines: Génie des procédés; Matériaux

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, 2015, 6, pp.8589/1-8589/7. ⟨10.1038/ncomms9589⟩. ⟨hal-02442098⟩