Flexible transition metal dichalcogenide nanosheets for band-selective photodetection

Dhinesh Babu Velusamy, Richard Hahnkee Kim, Soonyoung Cha, June Huh, Reza Khazaeinezhad, Sahar Hosseinzadeh Kassani, Giyoung Song, Suk Man Cho, Sung Hwan Cho, Ihn Hwang, Jinseong Lee, Kyunghwan Oh, Hyunyoug Choi () and Cheolmin Park ()
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Dhinesh Babu Velusamy: Yonsei University
Richard Hahnkee Kim: Yonsei University
Soonyoung Cha: School of Electrical and Electronic Engineering, Yonsei University
June Huh: Korea University, Anam-dong, Seongbuk-gu
Reza Khazaeinezhad: Photonic Device Physics Laboratory, Institute of Physics and Applied Physics, Yonsei University
Sahar Hosseinzadeh Kassani: Photonic Device Physics Laboratory, Institute of Physics and Applied Physics, Yonsei University
Giyoung Song: Yonsei University
Suk Man Cho: Yonsei University
Sung Hwan Cho: Yonsei University
Ihn Hwang: Yonsei University
Jinseong Lee: Yonsei University
Kyunghwan Oh: Photonic Device Physics Laboratory, Institute of Physics and Applied Physics, Yonsei University
Hyunyoug Choi: School of Electrical and Electronic Engineering, Yonsei University
Cheolmin Park: Yonsei University

Nature Communications, 2015, vol. 6, issue 1, 1-11

Abstract: Abstract The photocurrent conversions of transition metal dichalcogenide nanosheets are unprecedentedly impressive, making them great candidates for visible range photodetectors. Here we demonstrate a method for fabricating micron-thick, flexible films consisting of a variety of highly separated transition metal dichalcogenide nanosheets for excellent band-selective photodetection. Our method is based on the non-destructive modification of transition metal dichalcogenide sheets with amine-terminated polymers. The universal interaction between amine and transition metal resulted in scalable, stable and high concentration dispersions of a single to a few layers of numerous transition metal dichalcogenides. Our MoSe2 and MoS2 composites are highly photoconductive even at bending radii as low as 200 μm on illumination of near infrared and visible light, respectively. More interestingly, simple solution mixing of MoSe2 and MoS2 gives rise to blended composite films in which the photodetection properties were controllable. The MoS2/MoSe2 (5:5) film showed broad range photodetection suitable for both visible and near infrared spectra.

Date: 2015
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DOI: 10.1038/ncomms9063

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