Inkjet-printed TMDC–graphene heterostructures for flexible and broadband photodetectors

The development of inkjet-printed 2D crystal inks offers the ability to print different 2D materials on various substrates to form vertical heterostructures. However, the detailed characterization of the atomic structures of the inkjet-printed MoTe2 nanosheets has been rarely reported. In this work,...

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Veröffentlicht in:Journal of applied physics 2022-06, Vol.131 (23)
Hauptverfasser: Wan, Xi, Gao, Mingliang, Xu, Shijia, Huang, Tianhao, Duan, Yaoyu, Chen, EnZi, Chen, Kun, Zeng, Xiaoliang, Xie, Weiguang, Gu, Xiaofeng
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container_issue 23
container_start_page
container_title Journal of applied physics
container_volume 131
creator Wan, Xi
Gao, Mingliang
Xu, Shijia
Huang, Tianhao
Duan, Yaoyu
Chen, EnZi
Chen, Kun
Zeng, Xiaoliang
Xie, Weiguang
Gu, Xiaofeng
description The development of inkjet-printed 2D crystal inks offers the ability to print different 2D materials on various substrates to form vertical heterostructures. However, the detailed characterization of the atomic structures of the inkjet-printed MoTe2 nanosheets has been rarely reported. In this work, water-based 2D crystal inks of MoTe2, WS2, and graphene have been prepared and printed to obtain the flexible photodetectors. The absorption coefficient of MoTe2 has been estimated as α (500 nm) = 925 ± 47 lg−1 m−1 using the gravimetric method. Intriguingly, the inkjet-printed MoTe2 nanosheets down to 4 nm show both the semiconducting 2H and metallic 1T′ phases. The responsivities of the photodetectors based on MoTe2/graphene and WS2/graphene heterostructures can reach 120 mA/W and 2.5 A/W at 532 nm, respectively. Moreover, the inkjet-printed MoTe2/graphene shows a responsivity of 7.7 mA/W at 940 nm. The fabrication technique of inkjet printing will help design flexible optoelectronic devices based transition metal dichalcogenide–graphene heterostructures for the near-infrared photo detection.
doi_str_mv 10.1063/5.0093882
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subjects Absorptivity
Broadband
Graphene
Heterostructures
Inkjet printing
Inks
Molybdenum compounds
Nanostructure
Optoelectronic devices
Photometers
Substrates
Tellurides
Transition metal compounds
Tungsten disulfide
Two dimensional materials
title Inkjet-printed TMDC–graphene heterostructures for flexible and broadband photodetectors
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