title: 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 of ∼10(5) 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 >100 A W(-1) and a fast response time of ∼100 μs. 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.
authors.affiliation: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Yuanda
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Fengqiu
authors.initials: F
authors.lastname: Wang
authors.affiliation: Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.
authors.forename: Xiaomu
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
authors.forename: Xizhang
authors.initials: X
authors.lastname: Wang
authors.affiliation: CNRS; Institut Carnot Cirimat; F-31062 Toulouse, France.|Université de Toulouse; UPS, INP, Institut Carnot Cirimat; 118, route de Narbonne, F-31062 Toulouse cedex 9, France.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Flahaut
authors.affiliation: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Liu
authors.affiliation: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Xinran
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Yongbing
authors.initials: Y
authors.lastname: Xu
authors.affiliation: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Shi
authors.affiliation: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Rong
authors.initials: R
authors.lastname: Zhang