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

Yuanda Liu, Fengqiu Wang (), Xiaomu Wang (), Xizhang Wang, Emmanuel Flahaut, Xiaolong Liu, Yao Li, Xinran Wang, Yongbing Xu, Yi Shi and Rong Zhang ()
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Yuanda Liu: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Fengqiu Wang: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Xiaomu Wang: Yale University
Xizhang Wang: School of Chemistry and Chemical Engineering, Nanjing University
Emmanuel Flahaut: CNRS; Institut Carnot Cirimat
Xiaolong Liu: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Yao Li: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Xinran Wang: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Yongbing Xu: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Yi Shi: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Rong Zhang: School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: 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 ∼105 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.

Date: 2015
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DOI: 10.1038/ncomms9589

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