Flexible transition metal dichalcogenide nanosheets for band-selective photodetection.
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.
Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea.
Dhinesh Babu
DB
Velusamy
Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea.
Richard Hahnkee
RH
Kim
School of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, Korea.
Soonyoung
S
Cha
Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Korea.
June
J
Huh
Photonic Device Physics Laboratory, Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea.
Reza
R
Khazaeinezhad
Photonic Device Physics Laboratory, Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea.
Sahar Hosseinzadeh
SH
Kassani
Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea.
Giyoung
G
Song
Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea.
Suk Man
SM
Cho
Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea.
Sung Hwan
SH
Cho
Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea.
Ihn
I
Hwang
Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea.
Jinseong
J
Lee
Photonic Device Physics Laboratory, Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea.
Kyunghwan
K
Oh
School of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, Korea.
Hyunyoug
H
Choi
Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea.
Cheolmin
C
Park